Recrystallization behaviors of alloy IC10 at elevated temperature: experiments and modeling

Abstract

IC10 is a newly developed Ni₃Al-based superalloy. In order to investigate the recrystallization behaviors of IC10, tensile experiments were conducted over a wide range of strain rates (10⁻⁴–10⁻²s⁻¹) and temperatures (1173–1373 K) on a material testing system (MTS809). And the TEM examinations were operated to characterize deformation mechanisms of IC10. Experiments show that: (1) at the temperature range from 1173 to 1373 K, the domination behavior of IC10 is recrystallization behavior; (2) the flow stress depends to a high degree on the strain rates and temperatures; (3) there are both edge and screw dislocations on the cube plane, and these dislocations have a tendency to form the slipbands at the interphase boundaries, which is the domination mechanism of recrystallization behaviors. In order to capture the flow features of IC10, a new phenomenological constitutive equation is developed. The new model is used to describe the recrystallization behaviors of IC10 at various conditions. The predicted data fit well with the experiments, and the average relative errors at various conditions are less than 3%. It shows that the model is valid.