Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 25    No. 6    June 2015

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Hot deformation behavior and workability of pre-extruded ZK60A magnesium alloy
Shi-yi WANG1, Lei GAO2, Alan A. LUO3, De-jiang LI1, Xiao-qin ZENG1

1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University,
Shanghai 200240, China;
2. General Motors China Science Lab, Shanghai 201206, China;
3. College of Engineering, the Ohio State University, Columbus, OH 43210, USA

Abstract:The hot deformation behavior and workability of pre-extruded ZK60A magnesium alloy were investigated by compression tests in the temperature range of 250-450 °C and the strain rate range of 0.001-10 s-1. The constitutive equation for the pre-extruded ZK60A alloy can be described by hyperbolic sine function. Processing maps were constructed from true strains of -0.2 to -0.8. The alloy experienced complete dynamic recrystallization (DRX) and showed good workability in the temperature range of 300-400 °C and the strain rate range of 0.01-0.001 s-1, where hot working in pre-extruded ZK60A, such as forging, can be carried out. For large deformation to true strain of over -0.5, strain rates above 0.1 s-1 are not recommended at all temperatures, where flow instability such as local strain concentration, twinning deformation, abnormal grain growth, micro-cracks, and shear fracture were observed. Climb-controlled dislocation creep dominates both the plastic deformation and nucleation of DRX of the pre-extruded ZK60A magnesium alloy.

 

Key words: pre-extruded ZK60A magnesium alloy; hot deformation; processing map; constitutive equation; workability

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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