Modelling Plasticity of Ni3Al-Based L12 Intermetallic Single Crystals. II. Two-Step (T1) and T2) Deformation Behaviour (Postprint)

摘要

The two-step (T1 and T2) deformation behaviour of Ni3Al-based single crystals was modelled under the framework of a new constitutive model proposed by Y.S. Choi, D.M. Dimiduk, M.D. Uchic, et al. Phil. Mag. 87 1939 (2007). A new set of formulations and criteria, which identify thermally reversible and irreversible components of the constitutive variable a and define the relative significance of those components, was developed and implemented within the new constitutive framework. The simulation results well captured the general qualitative trends of the flow behaviour upon re-straining at T2 after pre- straining at T1 for both T1> T2 and T1.