Effect of circumferential strain rate on dynamic recrystallization and texture of Mg-13Gd-4Y-2Zn-0.5Zr alloy during rotary backward extrusion

Journal of Magnesium and Alloys

Guanshi Zhang¹  Jianmin Yu²  Yaojin Wu²  Zheng Shi²  Yingze Meng³  Zhimin Zhang³ 

[1] Corresponding author.i;College of Materials Science and Engineering, North University of China, xueyuan road 3,Taiyuan, Shanxi, Taiyuan 030051, China;College of Mechanical and Electrical Engineering, North University of China, Taiyuan 030051, China;

关键词: Mg-Gd-Y-Zn-Zr alloy;    Rotary backward extrusion;    Dynamic recrystallization;    Texture;   

DOI  :  

来源: DOAJ

【 摘 要 】

Gleeble-3500 thermal simulator was applied to realize the rotary backward extrusion forming of Mg-13Gd-4Y-2Zn-0.5Zr (wt%) alloy at different circumferential strain rate from 0.009 s−1 to 0.027 s−1 at 400 °C and the dynamic recrystallization mechanism and texture evolution were studied. The results show that the grain size of the alloy was obviously refined after rotary backward extrusion. As the circumferential strain rate increased, the dynamic recrystallization fraction gradually increased causing the grain size decreased and the distribution of microstructure became more uniform. At the same time, the texture of {0001}, {10-10}, {11-20} was weakened and the grain orientation distribution became more random. With the increase of circumferential strain rate, the discontinuous dynamic recrystallization mechanism became dominant, which promoted the weakening of texture and grain refinement of the alloy.

【 授权许可】

Unknown