High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion

Archives of Metallurgy and Materials

B. Ahn¹  M.C. Oh¹  M. Kawasaki²  H.-J. Lee² 

[1] DEPARTMENT OF ENERGY SYSTEMS RESEARCH, AJOU UNIVERSITY, SUWON, KOREA;DIVISION OF MATERIALS SCIENCE AND ENGINEERING, HANYANG UNIVERSITY, SEOUL, KOREA

关键词: Keywords: activation energy;    extrusion;    flow mechanism;    magnesium alloy;    tensile property;   

DOI  :  10.1515/amm-2015-0124

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Flow behavior of a ZK60A magnesium alloy after continuous casting and subsequent extrusion was examined in tension at a range of strain rates of 3.0×10−6 − 1.0×10−2 s−1 at temperatures of 473-623K. The results demonstrated that the alloy exhibited a maximum elongation of ~250% at 523K when tested at an initial strain rate of 1.0×10−5 s−1 and strain rate sensitivity, m, of ~0.3-0.4 and the activation energy of ~94 kJ/mol were calculated under the testing conditions. The detailed investigation suggested that the high temperature flow of the ZK60A alloy having submicrometer grains demonstrates quasi-superplastic flow behavior controlled by a dislocation viscous glide process.

【 授权许可】

Unknown