Hot deformation behavior of multilayered Ti/Ni composites during isothermal compression

Abstract

The hot deformation behavior of multilayered Ti/Ni composites was studied by isothermal compression tests in the temperature range of 500–700 °C and strain rate range of 0.001–10.0 s−1. The Arrhenius-type constitutive model was constructed and the constants were determined for the composites. In addition, the processing maps were constructed using the principle of the dynamic materials model (DMM). The results show that the Arrhenius-type model can provide an accurate prediction of the flow behavior of the multilayered Ti/Ni composites under different conditions. The higher energy dissipation efficiency is observed at medium & high temperature/low strain rate. The unstable region of the multilayered Ti/Ni composites is large due to the presence of interfaces. At strain of 1.0, the optimum processing parameters of the multilayered Ti/Ni composites are at 630–700 °C/0.001–0.003 s−1 with a peak power dissipation of 0.40. Additionally, the deformation mechanism of Ni layers is mainly work hardening at 500–700 °C/0.001–10.0 s−1, whereas the deformation mechanism of Ti layers is mainly dynamic recovery at 700 °C/0.001 s−1 and work hardening at 500–600 °C/0.001 s−1 and 700 °C/0.1–10.0 s−1.