Towards mechanism-based constitutive modelling of L1₂ crystal plasticity

Abstract

A single-crystal plasticity model of the L12 structure intermetallic compound Ni3Al is developed, in light of recent theoretical developments and experimental evidence. Computational results show that the model is capable of predicting the major anomalous mechanical behaviors of L12 structures, including increase of yield strength with increasing temperature, strong orientation dependence of the yield stress, tensioncompression asymmetry, and small strain rate sensitivity. Some ideas on revising the plasticity model have been presented. Though not completed, the new approach points to promising future directions in simulating both the yield behavior and the strain hardening properties of L12 compounds.