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Coupling Effects of Grain Structure, Precipitates and Solid Solubility on the Hot Deformation Behaviors of Cu-3.18 wt% Ti Alloy

Abstract

The poor hot workability of Cu-Ti alloys severely restricts the further improvements of properties and applications. In this work, the coupling effects of grain structure, precipitates and solid solubility on the hot deformation behaviors of Cu-3.18 wt% Ti alloy were deeply studied. Our results show that based on the obtained constitutive equation and thermal activation energies, the corresponding hot workability maps of alloy can be established and used to guide the designation of hot working process. The complex interactions that occur between dislocation and precipitates lead to the differences in Dynamic Recrystallization (DRX) and precipitation for the changed strain rates and temperatures. The deformability can be improved by coupling control of DRX and dynamic precipitation. The mechanisms of hot deformation and microstructure evolution, including grain structure, precipitates, and solid solubility of Ti in the matrix during the hot deformation, have been proposed. Our results provide fundamental insight into the dynamic recrystallization, precipitation and coordinated deformation of Cu-Ti alloys with poor deformability, as a function of hot strain.

Kuo Yang, Miaomiao Wang, Mingxing Guo, Hu Wang, Yongda Mo, Fang Liu, Yunpeng Wang, Huafen Lou

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