Dynamic Recrystallization Behavior of Mg-8Gd-0.5Zr Alloy During Hot Compression Deformation
ZHU Limin1,2, LI Quanan1,2, CHEN Xiaoya1,3, ZHANG Qing1,2, WANG Songbo1, ZHANG Shuai1
1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023 2 Collaborative Innovation Center of Nonferrous Metal, Henan Province, Luoyang 471023 3 School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 740048
Abstract: The hot deformation behaviors of Mg-8Gd-0.5Zr was studied by hot compression tests in the temperature range of 350—500 ℃ under strain rates of 0.002—1 s-1. The flow stress and microstructures of the alloy were discussed. The relationship between grain size of dynamic recrystallization (DRX) and temperature were analyzed. The critical strain (εc) of DRX was calculated. Results showed that the flow stress curves conformed to the characteristic of dynamic recrystallization. The peak stress decreased as the temperature increased or the strain rate decreased, and the peak strain (εp) also decreased. The dynamically recrystallized (DRXed) grains were fine in the range of 350—450 ℃, and the grain size increased slowly but increased rapidly in 450—500 ℃. The grain size of DRX was 25 μm after hot compression in 500 ℃. According to calculation of work hardening rate, it was found that the DRX occured prior to peak strain. The relationship between peak strain and critical strain was εc=0.442εp. The critical model of recrystallization was established.
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2019, Vol. 33 
