Ductility enhancement of EW75 alloy by multi-directional forging

Journal of Magnesium and Alloys

M. Hong¹  X.H. Du¹  D. Wu²  R.S. Chen² 

[1] Shenyang Aerospace University, School of Materials Science and Engineering, Shenyang 110136, China;The Group of Magnesium Alloys and Their Applications, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang 110016, China;

关键词: Mg alloys;    Ductility;    Multi-directional forging;    DRX;    Precipitates;   

DOI  :  10.1016/j.jma.2014.11.005

来源: DOAJ

【 摘 要 】

In this study, the Mg–7Gd–5Y–1Nd–0.5Zr alloy can reach a high ductility by the process of multi-directional forging, and the evolution of the microstructure, texture and the mechanical properties were discussed systematically. The results show that after the solutionized sample was multi-forged at 500 °C, its grain size can be refined from 292 um to 58 um. As the forging temperature decreased, fine particles precipitated in the matrix. The volume fraction of the particles increased with the forging temperature decreasing, so the nucleation and growth of crystallization were strongly restricted. There was no recrystallization as the forging temperature fell to 410 °C, and the severe deformed grains distributed as streamlines perpendicular to the final compression axis. The texture intensity decreased with increasing forging passes. The sample with best ductility was obtained after compressed at 470 °C, with an elongation to failure of 21% at room temperature, which is increased by 200%, in comparison with that of the samples in solutionized condition. EBSD results revealed that the mean grain size was 15 um. Refined grains as well as the weakened texture were the key factors to its high ductility.

【 授权许可】

Unknown