Modelling plasticity of Ni3Al-based L12 intermetallic single crystals. I. Anomalous temperature dependence of the flow behaviour§
作者： Y. S. Choi , D. M. Dimiduk , M. D. Uchic , T. A. Parthasarathy
DOI: 10.1080/14786430601169782
关键词: Metallurgy 、 Constitutive equation 、 Asymmetry 、 Slip (materials science) 、 Thermodynamics 、 Finite element method 、 Intermetallic 、 Mathematical model 、 Flow stress 、 Materials science 、 Plasticity
摘要: A comprehensive mechanism-based crystallographic constitutive model has been developed for L12-structured Ni3Al-based intermetallic single crystals. This represents the unusual thermomechanical behaviours of Ni3Al, such as anomalous temperature dependence both flow stress and strain-hardening rate (SHR), strain these an orientation-dependent tension–compression asymmetry. The framework was based on two major contributions to plastic flow, namely repeated cross-slip exhaustion athermal defeat screw-character dislocations, motion macro-kinks (MKs). contribution irreversible obstacle storage incorporated into formulations a resistance against glide MKs. implemented in finite element method numerical framework, simulation results showed qualitative agreement with experimental observations. §This paper is dedicated Dr. Peter M. Hazzledine (1940–2005), one f...
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