Nanoindentation Elastoplastic and Creep Behaviors of Sintered Nano-Silver Doped with Nickel-Modified Multiwall Carbon Nanotube Filler

Abstract In this paper, the elastoplastic and creep constitutive behaviors of sintered silver with varying amounts of nickel-modified multiwall carbon nanotubes are studied through a systematic investigation of the nanoindentation test. Elastoplastic stress–strain curves for the sintered silver with...
Ausführliche Beschreibung

Abstract In this paper, the elastoplastic and creep constitutive behaviors of sintered silver with varying amounts of nickel-modified multiwall carbon nanotubes are studied through a systematic investigation of the nanoindentation test. Elastoplastic stress–strain curves for the sintered silver with different additive content are obtained based on reverse analysis. The addition of nickel-modified multiwall carbon nanotubes reduced the yielding stress from 110.68 MPa to 61.61 MPa and generally increased the strain-hardening exponent from 0.26 to 0.41. The initial and steady-state creep stress exponent remained almost unchanged. However, the creep coefficient increased remarkably. Otherwise, the yielding stress was confirmed to agree well with the Hall–Petch relation, and the hardening exponent was found to follow Morrison’s law. The creep exponents and creep coefficients were also obtained and shown to be highly related to the particle size and positively correlated with porosity. The creep regime at room temperature was confirmed to obey Sherby’s model. This investigation shows the effect of additive content on sintered silver. The study given in this paper could deepen the understanding of the strengthening effect of nickel-modified multiwall carbon nanotubes on the mechanical performance of sintered silver at room temperature. Ausführliche Beschreibung