微量Ca元素对AZ31镁合金热变形行为的影响

doi:10.11896/cldb.19050152

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Abstract The isothermal compression tests of AZ31 magnesium alloy and addition of 0.2wt% Ca of AZ31 magnesium alloy (AZ31-0.2Ca) were carried out on the Gleeble-3500 thermal simulation testing machine in the temperature range from 300 ℃ to 500 ℃ and the strain rate range from 0.001 s^-1 to 1 s^-1. Based on the stress-strain curves, the constitutive equations established by hyperbolic sine function and the processing maps established using dynamic material model (DMM), the influence of Ca on thermal deformation behavior of AZ31 magnesium alloy was systematically analyzed. The results indicate that the addition of Ca increases the stress level at lower temperature and higher strain rate, reduces the stress exponent n value, and has a negligible influence on the activation energy Q value. In addition, adding Ca can expand the processing zone of AZ31 magnesium alloy, and the optimal processing zone of the AZ31-0.2Ca is in the temperature range of 400—490 ℃, the strain rate range of 0.001—0.01 s^-1 and the temperature range of 420—480 ℃, the strain rate range of 0.2—1 s^-1.

Key words： magnesium alloy calcium processing map hot compression deformation

Published: 29 May 2020

CLC number:

TG146.2

Fund:This work was financially supported by the National Key Research and Development Plan (2017YFB1300700), the National Natural Science Foundation of China (51671041).

About author:: Yulu Xie is a master and mainly engaged in the research of magnesium alloy materials. She has been studying in the College of Materials Science and Engineering of Chongqing University since Sep. 2017.
Guangsheng Huang received his Ph.D. degree in material processing engineering from the Chongqing University in Sep. 2000—Jun. 2003. He is currently a professor and doctoral supervisor. He has long been committed to the research of magnesium alloy and other light metal materials, mainly carrying out the research on the theory of magnesium alloy plastic forming and new processing technology.

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	XIE Yulu
	HUANG Guangsheng
	LIU Shuaishuai
	ZHANG Junlei
	PAN Fusheng

Cite this article:

XIE Yulu,HUANG Guangsheng,LIU Shuaishuai, et al. Effect of Microelement Calcium on Thermal Deformation Behavior of AZ31 Magnesium Alloy[J]. Materials Reports, 2020, 34(12): 12070-12075.

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http://www.mater-rep.com/EN/10.11896/cldb.19050152 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12070

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