A crystallographic constitutive model for Ni3Al (L12) intermetallics

A constitutive model was developed in order to capture the unique thermo-mechanical flow behavior of L12-structured Ni3(Al, X) alloys. This model utilized a framework for flow-stress partitioning, which was previously proposed by Ezz and Hirsch, and incorporated a model for exhaustion hardening proposed by Caillard. The simulation results well represent the major aspects of the thermo-mechanical flow behavior of Ni3(Al, X) alloys, such as a flow-stress anomaly, its strain dependence and a work-hardening rate anomaly. Selected limitations are discussed along with our current efforts toward extending the present model.