Influence of Initial Microstructure on the Hot Working Flow Stress of ZK60 Mg Alloy
The hot working flow stress of as-cast and two as-extruded magnesium alloys ZK60 was investigated through uniaxial compression tests. It was found that the hot deformation behavior was sensitive to the deformation conditions and initial microstructure. The peak flow stress was affected by the deformation temperature and the strain rate. Its value was decreased with increasing the deformation temperature or decreasing the deformation rate. The peak flow stresses for the as-cast and as-extruded samples showed a different Z dependency. However, the correlations between Z parameters and as-extruded materials with different initial microstructures were almost the same. These key features of deformation behavior can be explained by twinning and dynamic recrystallization.
KeywordsMagnesium alloys Initial microstructure Uniaxial compression High temperature Deformation behavior
This work was supported by “The National Key Research and Development Program of China” (No. 2017YFB0103904, 2016YFB0301105), Shandong Provincial Natural Science Foundation, China (No. ZR2015EQ 019).
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