Mg-8Gd-0.5Zr合金热压缩过程中动态再结晶行为

doi:10.11896/cldb.18110190

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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 (ε_c) 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 (ε_p) 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 ε_c=0.442ε_p. The critical model of recrystallization was established.

Key words： Mg-8Gd-0.5Zr alloy hot compression dynamic recrystallization critical strain

Published: 28 October 2019

CLC number:

TG146.2.2

Fund:This work was financially supported by the National Natural Science Foundation of China (51571084).

About author:: Limin Zhu received her M. S. degrees in June 2014 from Liaoning Technical University. She is currently an associate professor in Henan University of Science and Technology, focusing on the research of the design and development of high-performance magnesium alloys. She has published more than 20 research papers in domestic and foreign journals;Quanan Li is currently a professor in Henan University of Science and Technology. His reseatch interests are rare-earth functional materials, rare earth aluminum alloys, rare earth aluminum alloys and the surface modification of rare earth materials. He has presided over more than 10 projects including the national natural science foundation of China, Henan outstanding talents fund and Henan outstanding youth fund. He has published more than 300 research papers, and he has been granted more than 20 national invention patents.

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	ZHU Limin
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Cite this article:

ZHU Limin,LI Quanan,CHEN Xiaoya, et al. Dynamic Recrystallization Behavior of Mg-8Gd-0.5Zr Alloy During Hot Compression Deformation[J]. Materials Reports, 2019, 33(24): 4117-4121.

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http://www.mater-rep.com/EN/10.11896/cldb.18110190 OR http://www.mater-rep.com/EN/Y2019/V33/I24/4117

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