Dynamic Recrystallization Behavior and Texture Evolution of NiAl Intermetallic During Hot Deformation

Abstract

B2-ordered intermetallic NiAl was fabricated by hot pressing sintering and studied in terms of dynamic recrystallization behavior and texture evolution during isothermal compression over a temperature range of 1100-1300 °C and strain rate of 10−2 s−1 as well as strain rate of 10−3 to 10−1 s−1 and temperature of 1250 °C. It is found that DDRX mechanism operates predominantly at a high temperature and medium strain rate, while CDRX process is enhanced in the deformation condition of medium temperature and high strain rate yet in a localized way. In particular, progressive subgrain rotation takes place at 1250 °C/10−1 s−1. Conversely, dynamic recrystallization process is insufficient in the case of 1250 °C/10−3 s−1 and 1100 °C/10−2 s−1. Original hot pressing sintered billets are microstructurally homogeneous. Orientation distribution function sections reveal that the strong {110}〈111〉 and {112}〈111〉 texture components appear after deformation. Furthermore, the textures are strengthened with increasing temperature and strain rate.