Analysis of flow stress of ZK60 wrought magnesium at elevated temperatures
(1.山西省太原市北方大学材料科学与工程学院2.School of Materials Science and Engineering, North University of China, Taiyuan 030051, China3.湖南省长沙市中南工业大学粉末冶金研究所4.Engineering Research Center of Magnesium-base Material Processing Technology, Ministry of Education)
Abstract: The true stress—strain curves of compressed ZK60 alloy have two typical characters. Most thermal simulation compressing curves of ZK60 have the obvious character that around 0.2 in strain the stress reaches the peak and declines rapidly afterwards and lands the lowest. The decline of the curve illustrates that the test specimen has been destroyed and crackles can be found on the test specimen correspondingly. And the other true stress increases to a peak and then decreases to a steady state, indicating that dynamic recrystallization has occurred in ZK60 alloy. From the analysis of the results we can receive the optimized composite of the deformed parameters and get the reasonable deformed temperatures to be 200 ℃ or 400 ℃, which can play a directing role in determining the deforming technology of wrought magnesium alloys.
Key words: ZK60; wrought magnesium alloy; stress; strain