Ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures
The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also c...
Ausführliche Beschreibung
Autor*in: |
Lahiri, Debrupa [verfasserIn] |
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E-Artikel |
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Englisch |
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2013transfer abstract |
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Umfang: |
9 |
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Übergeordnetes Werk: |
Enthalten in: Nonlinear relationship between monetary policy and stock returns: Evidence from the U.S. - Chauvet, Marcelle ELSEVIER, 2022, Amsterdam [u.a.] |
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Übergeordnetes Werk: |
volume:61 ; year:2013 ; number:11 ; pages:4001-4009 ; extent:9 |
Links: |
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DOI / URN: |
10.1016/j.actamat.2013.03.014 |
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Katalog-ID: |
ELV022190368 |
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520 | |a The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. | ||
520 | |a The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. | ||
650 | 7 | |a Tantalum carbide |2 Elsevier | |
650 | 7 | |a Deformation mechanism |2 Elsevier | |
650 | 7 | |a Ultrahigh pressure |2 Elsevier | |
650 | 7 | |a Room-temperature consolidation |2 Elsevier | |
700 | 1 | |a Singh, Virendra |4 oth | |
700 | 1 | |a Rodrigues, Giovani Ritta |4 oth | |
700 | 1 | |a Costa, Tania Maria Haas |4 oth | |
700 | 1 | |a Gallas, Marcia R. |4 oth | |
700 | 1 | |a Bakshi, Srinivasa Rao |4 oth | |
700 | 1 | |a Seal, Sudipta |4 oth | |
700 | 1 | |a Agarwal, Arvind |4 oth | |
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10.1016/j.actamat.2013.03.014 doi GBVA2013018000030.pica (DE-627)ELV022190368 (ELSEVIER)S1359-6454(13)00224-3 DE-627 ger DE-627 rakwb eng 670 670 DE-600 330 VZ Lahiri, Debrupa verfasserin aut Ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures 2013transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. Tantalum carbide Elsevier Deformation mechanism Elsevier Ultrahigh pressure Elsevier Room-temperature consolidation Elsevier Singh, Virendra oth Rodrigues, Giovani Ritta oth Costa, Tania Maria Haas oth Gallas, Marcia R. oth Bakshi, Srinivasa Rao oth Seal, Sudipta oth Agarwal, Arvind oth Enthalten in Elsevier Science Chauvet, Marcelle ELSEVIER Nonlinear relationship between monetary policy and stock returns: Evidence from the U.S. 2022 Amsterdam [u.a.] (DE-627)ELV009239057 volume:61 year:2013 number:11 pages:4001-4009 extent:9 https://doi.org/10.1016/j.actamat.2013.03.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 61 2013 11 4001-4009 9 045F 670 |
spelling |
10.1016/j.actamat.2013.03.014 doi GBVA2013018000030.pica (DE-627)ELV022190368 (ELSEVIER)S1359-6454(13)00224-3 DE-627 ger DE-627 rakwb eng 670 670 DE-600 330 VZ Lahiri, Debrupa verfasserin aut Ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures 2013transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. Tantalum carbide Elsevier Deformation mechanism Elsevier Ultrahigh pressure Elsevier Room-temperature consolidation Elsevier Singh, Virendra oth Rodrigues, Giovani Ritta oth Costa, Tania Maria Haas oth Gallas, Marcia R. oth Bakshi, Srinivasa Rao oth Seal, Sudipta oth Agarwal, Arvind oth Enthalten in Elsevier Science Chauvet, Marcelle ELSEVIER Nonlinear relationship between monetary policy and stock returns: Evidence from the U.S. 2022 Amsterdam [u.a.] (DE-627)ELV009239057 volume:61 year:2013 number:11 pages:4001-4009 extent:9 https://doi.org/10.1016/j.actamat.2013.03.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 61 2013 11 4001-4009 9 045F 670 |
allfields_unstemmed |
10.1016/j.actamat.2013.03.014 doi GBVA2013018000030.pica (DE-627)ELV022190368 (ELSEVIER)S1359-6454(13)00224-3 DE-627 ger DE-627 rakwb eng 670 670 DE-600 330 VZ Lahiri, Debrupa verfasserin aut Ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures 2013transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. Tantalum carbide Elsevier Deformation mechanism Elsevier Ultrahigh pressure Elsevier Room-temperature consolidation Elsevier Singh, Virendra oth Rodrigues, Giovani Ritta oth Costa, Tania Maria Haas oth Gallas, Marcia R. oth Bakshi, Srinivasa Rao oth Seal, Sudipta oth Agarwal, Arvind oth Enthalten in Elsevier Science Chauvet, Marcelle ELSEVIER Nonlinear relationship between monetary policy and stock returns: Evidence from the U.S. 2022 Amsterdam [u.a.] (DE-627)ELV009239057 volume:61 year:2013 number:11 pages:4001-4009 extent:9 https://doi.org/10.1016/j.actamat.2013.03.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 61 2013 11 4001-4009 9 045F 670 |
allfieldsGer |
10.1016/j.actamat.2013.03.014 doi GBVA2013018000030.pica (DE-627)ELV022190368 (ELSEVIER)S1359-6454(13)00224-3 DE-627 ger DE-627 rakwb eng 670 670 DE-600 330 VZ Lahiri, Debrupa verfasserin aut Ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures 2013transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. Tantalum carbide Elsevier Deformation mechanism Elsevier Ultrahigh pressure Elsevier Room-temperature consolidation Elsevier Singh, Virendra oth Rodrigues, Giovani Ritta oth Costa, Tania Maria Haas oth Gallas, Marcia R. oth Bakshi, Srinivasa Rao oth Seal, Sudipta oth Agarwal, Arvind oth Enthalten in Elsevier Science Chauvet, Marcelle ELSEVIER Nonlinear relationship between monetary policy and stock returns: Evidence from the U.S. 2022 Amsterdam [u.a.] (DE-627)ELV009239057 volume:61 year:2013 number:11 pages:4001-4009 extent:9 https://doi.org/10.1016/j.actamat.2013.03.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 61 2013 11 4001-4009 9 045F 670 |
allfieldsSound |
10.1016/j.actamat.2013.03.014 doi GBVA2013018000030.pica (DE-627)ELV022190368 (ELSEVIER)S1359-6454(13)00224-3 DE-627 ger DE-627 rakwb eng 670 670 DE-600 330 VZ Lahiri, Debrupa verfasserin aut Ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures 2013transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. Tantalum carbide Elsevier Deformation mechanism Elsevier Ultrahigh pressure Elsevier Room-temperature consolidation Elsevier Singh, Virendra oth Rodrigues, Giovani Ritta oth Costa, Tania Maria Haas oth Gallas, Marcia R. oth Bakshi, Srinivasa Rao oth Seal, Sudipta oth Agarwal, Arvind oth Enthalten in Elsevier Science Chauvet, Marcelle ELSEVIER Nonlinear relationship between monetary policy and stock returns: Evidence from the U.S. 2022 Amsterdam [u.a.] (DE-627)ELV009239057 volume:61 year:2013 number:11 pages:4001-4009 extent:9 https://doi.org/10.1016/j.actamat.2013.03.014 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 61 2013 11 4001-4009 9 045F 670 |
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Enthalten in Nonlinear relationship between monetary policy and stock returns: Evidence from the U.S. Amsterdam [u.a.] volume:61 year:2013 number:11 pages:4001-4009 extent:9 |
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Nonlinear relationship between monetary policy and stock returns: Evidence from the U.S. |
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The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. 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ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures |
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Ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures |
abstract |
The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. |
abstractGer |
The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. |
abstract_unstemmed |
The deformation mechanism of the ultrahigh-temperature ceramic, tantalum carbide (TaC), consolidated at room temperature at a very high hydrostatic pressure of 7.7GPa is investigated using high-resolution transmission electron microscopy. The deformation behavior of TaC at room temperature is also compared with that consolidated at high temperature (1830°C) at a similar pressure. TaC could be consolidated to a bulk structure (90% theoretical density) at room temperature. The deformation mechanisms operating at room temperature and 1830°C are found to be significantly different. The room-temperature deformation is dominated by the short-range movement of dislocations in multiple orientations, along with nanotwinning, grain rotation, crystallite misorientation with low-angle grain boundary formation and lattice structure destruction at interfaces. In contrast, at high temperature, the strain is accommodated mostly by a single slip system, forming a parallel array of dislocations. The consolidation at room temperature occurs by heavy deformation with the support from short range diffusion, whereas the consolidation at high temperature is mostly diffusion dominated, indicating a classic sintering mechanism. The improved degree of consolidation with fewer defects results in significantly improved elastic modulus and hardness in the case of high-temperature consolidate. |
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Ultrahigh-pressure consolidation and deformation of tantalum carbide at ambient and high temperatures |
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