On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials

Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Panos Tsakiropoulos [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	high entropy alloys complex concentrated alloys refractory metal intermetallic composites high entropy silicides complex concentrated silicides Nb silicide based alloys

Übergeordnetes Werk:	In: Metals - MDPI AG, 2012, 13(2023), 6, p 1023
Übergeordnetes Werk:	volume:13 ; year:2023 ; number:6, p 1023

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/met13061023

Katalog-ID:	DOAJ094101280

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520			\|a Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results.
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allfields	10.3390/met13061023 doi (DE-627)DOAJ094101280 (DE-599)DOAJ20b936f5d54940d28b4412bf1623aaa1 DE-627 ger DE-627 rakwb eng TN1-997 Panos Tsakiropoulos verfasserin aut On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results. high entropy alloys complex concentrated alloys refractory metal intermetallic composites high entropy silicides complex concentrated silicides Nb silicide based alloys Mining engineering. Metallurgy In Metals MDPI AG, 2012 13(2023), 6, p 1023 (DE-627)718627172 (DE-600)2662252-X 20754701 nnns volume:13 year:2023 number:6, p 1023 https://doi.org/10.3390/met13061023 kostenfrei https://doaj.org/article/20b936f5d54940d28b4412bf1623aaa1 kostenfrei https://www.mdpi.com/2075-4701/13/6/1023 kostenfrei https://doaj.org/toc/2075-4701 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2023 6, p 1023
spelling	10.3390/met13061023 doi (DE-627)DOAJ094101280 (DE-599)DOAJ20b936f5d54940d28b4412bf1623aaa1 DE-627 ger DE-627 rakwb eng TN1-997 Panos Tsakiropoulos verfasserin aut On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results. high entropy alloys complex concentrated alloys refractory metal intermetallic composites high entropy silicides complex concentrated silicides Nb silicide based alloys Mining engineering. Metallurgy In Metals MDPI AG, 2012 13(2023), 6, p 1023 (DE-627)718627172 (DE-600)2662252-X 20754701 nnns volume:13 year:2023 number:6, p 1023 https://doi.org/10.3390/met13061023 kostenfrei https://doaj.org/article/20b936f5d54940d28b4412bf1623aaa1 kostenfrei https://www.mdpi.com/2075-4701/13/6/1023 kostenfrei https://doaj.org/toc/2075-4701 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2023 6, p 1023
allfields_unstemmed	10.3390/met13061023 doi (DE-627)DOAJ094101280 (DE-599)DOAJ20b936f5d54940d28b4412bf1623aaa1 DE-627 ger DE-627 rakwb eng TN1-997 Panos Tsakiropoulos verfasserin aut On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results. high entropy alloys complex concentrated alloys refractory metal intermetallic composites high entropy silicides complex concentrated silicides Nb silicide based alloys Mining engineering. Metallurgy In Metals MDPI AG, 2012 13(2023), 6, p 1023 (DE-627)718627172 (DE-600)2662252-X 20754701 nnns volume:13 year:2023 number:6, p 1023 https://doi.org/10.3390/met13061023 kostenfrei https://doaj.org/article/20b936f5d54940d28b4412bf1623aaa1 kostenfrei https://www.mdpi.com/2075-4701/13/6/1023 kostenfrei https://doaj.org/toc/2075-4701 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2023 6, p 1023
allfieldsGer	10.3390/met13061023 doi (DE-627)DOAJ094101280 (DE-599)DOAJ20b936f5d54940d28b4412bf1623aaa1 DE-627 ger DE-627 rakwb eng TN1-997 Panos Tsakiropoulos verfasserin aut On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results. high entropy alloys complex concentrated alloys refractory metal intermetallic composites high entropy silicides complex concentrated silicides Nb silicide based alloys Mining engineering. Metallurgy In Metals MDPI AG, 2012 13(2023), 6, p 1023 (DE-627)718627172 (DE-600)2662252-X 20754701 nnns volume:13 year:2023 number:6, p 1023 https://doi.org/10.3390/met13061023 kostenfrei https://doaj.org/article/20b936f5d54940d28b4412bf1623aaa1 kostenfrei https://www.mdpi.com/2075-4701/13/6/1023 kostenfrei https://doaj.org/toc/2075-4701 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2023 6, p 1023
allfieldsSound	10.3390/met13061023 doi (DE-627)DOAJ094101280 (DE-599)DOAJ20b936f5d54940d28b4412bf1623aaa1 DE-627 ger DE-627 rakwb eng TN1-997 Panos Tsakiropoulos verfasserin aut On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results. high entropy alloys complex concentrated alloys refractory metal intermetallic composites high entropy silicides complex concentrated silicides Nb silicide based alloys Mining engineering. Metallurgy In Metals MDPI AG, 2012 13(2023), 6, p 1023 (DE-627)718627172 (DE-600)2662252-X 20754701 nnns volume:13 year:2023 number:6, p 1023 https://doi.org/10.3390/met13061023 kostenfrei https://doaj.org/article/20b936f5d54940d28b4412bf1623aaa1 kostenfrei https://www.mdpi.com/2075-4701/13/6/1023 kostenfrei https://doaj.org/toc/2075-4701 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 13 2023 6, p 1023
language	English
source	In Metals 13(2023), 6, p 1023 volume:13 year:2023 number:6, p 1023
sourceStr	In Metals 13(2023), 6, p 1023 volume:13 year:2023 number:6, p 1023
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	high entropy alloys complex concentrated alloys refractory metal intermetallic composites high entropy silicides complex concentrated silicides Nb silicide based alloys Mining engineering. Metallurgy
isfreeaccess_bool	true
container_title	Metals
authorswithroles_txt_mv	Panos Tsakiropoulos @@aut@@
publishDateDaySort_date	2023-01-01T00:00:00Z
hierarchy_top_id	718627172
id	DOAJ094101280
language_de	englisch
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Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. 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callnumber-first	T - Technology
author	Panos Tsakiropoulos
spellingShingle	Panos Tsakiropoulos misc TN1-997 misc high entropy alloys misc complex concentrated alloys misc refractory metal intermetallic composites misc high entropy silicides misc complex concentrated silicides misc Nb silicide based alloys misc Mining engineering. Metallurgy On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials
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topic_title	TN1-997 On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials high entropy alloys complex concentrated alloys refractory metal intermetallic composites high entropy silicides complex concentrated silicides Nb silicide based alloys
topic	misc TN1-997 misc high entropy alloys misc complex concentrated alloys misc refractory metal intermetallic composites misc high entropy silicides misc complex concentrated silicides misc Nb silicide based alloys misc Mining engineering. Metallurgy
topic_unstemmed	misc TN1-997 misc high entropy alloys misc complex concentrated alloys misc refractory metal intermetallic composites misc high entropy silicides misc complex concentrated silicides misc Nb silicide based alloys misc Mining engineering. Metallurgy
topic_browse	misc TN1-997 misc high entropy alloys misc complex concentrated alloys misc refractory metal intermetallic composites misc high entropy silicides misc complex concentrated silicides misc Nb silicide based alloys misc Mining engineering. Metallurgy
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title	On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials
ctrlnum	(DE-627)DOAJ094101280 (DE-599)DOAJ20b936f5d54940d28b4412bf1623aaa1
title_full	On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials
author_sort	Panos Tsakiropoulos
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title_sort	on the nb<sub<5</sub<si<sub<3</sub< silicide in metallic ultra-high temperature materials
callnumber	TN1-997
title_auth	On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials
abstract	Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results.
abstractGer	Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results.
abstract_unstemmed	Refractory metal (RM) M<sub<5</sub<Si<sub<3</sub< silicides are desirable intermetallics in metallic ultra-high temperature materials (UHTMs), owing to their creep properties and high Si content that benefits oxidation resistance. Of particular interest is the alloyed Nb<sub<5</sub<Si<sub<3</sub< that forms in metallic UHTMs with Nb and Si addition. The choice of alloying elements and type of Nb<sub<5</sub<Si<sub<3</sub< that is critical for achieving a balance of properties or meeting a property goal in a metallic UHTM is considered in this paper. Specifically, the different types of alloyed “normal” Nb<sub<5</sub<Si<sub<3</sub< and Ti-rich Nb<sub<5</sub<Si<sub<3</sub<, namely “conventional”, “complex concentrated” (CC) or “high entropy” (HE) silicide, in metallic UHTMs with Nb and Si addition were studied. Advanced metallic UHTMs with additions of RMs, transition metals (TMs), Ge, Sn or Ge + Sn and with/without Al and with different Ti, Al, Cr, Si or Sn concentrations were investigated, considering that the motivation of this work was to support the design and development of metallic-UHTMs. The study of the alloyed silicides was based on the Nb/(Ti + Hf) ratio, which is key regarding creep, the parameters VEC and Δχ and relationships between them. The effect of alloying additions on the stability of “conventional”, CC or HE silicide was discussed. The creep and hardness of alloyed Nb<sub<5</sub<Si<sub<3</sub< was considered. Relationships that link “conventional”, CC or HE bcc solid solution and Nb<sub<5</sub<Si<sub<3</sub< in the alloy design methodology NICE (Niobium Intermetallic Composite Elaboration) were presented. For a given temperature and stress, the steady state creep rate of the alloyed silicide, in which TMs substituted Nb, and Al and B substituted Si, depended on its parameters VEC and Δχ and its Nb/(Ti + Hf) ratio, and increased with decreasing parameter and ratio value, compared with the unalloyed Nb<sub<5</sub<Si<sub<3</sub<. Types of alloyed Nb<sub<5</sub<Si<sub<3</sub< with VEC and Δχ values closest to those of the unalloyed Nb<sub<5</sub<Si<sub<3</sub< were identified in maps of alloyed Nb<sub<5</sub<Si<sub<3</sub<. Good agreement was shown between the calculated hardness and chemical composition of Nb<sub<5</sub<Si<sub<3</sub< and experimental results.
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title_short	On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials
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On the Nb<sub<5</sub<Si<sub<3</sub< Silicide in Metallic Ultra-High Temperature Materials

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