不同温度下AM80镁合金的动态力学响应及本构建模

doi:10.11896/cldb.20060276

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Abstract In order to built a constitutive model which can accurately predict the dynamic mechanical response of magnesium alloys, high-speed impact tests were carried out with AM80 alloy using a separate Hopkinson pressure bar. The deformation temperatures were 298 K, 423 K and 523 K, and the applied strain rate ranges from 1 100 s^-1 to 5 000 s^-1. At 298 K, the flow stress of magnesium alloy exhibits a positive strain rate sensiti-vity (SRS), followed by a negative SRS as the strain rate increases to 5 000 s^-1 in the later deformation stage. At 423 K and 523 K, the flow stress of magnesium alloy first shows a positive SRS, and then illustrates a negative SRS as the strain rate is higher than their critical values. An optimized Johnson-Cook constitutive model is built by modifying the strain rate strengthening parameter C and strain hardening parameter n to a function of deformation temperature T. The errors between the constitutive fitting and experiment results are within the range of -10%—10%, and the correlation coefficient R and average absolute relative error (AARE) are 0.987 and 3.88%, respectively. These shows that the optimized constitutive can accurately predict the high-speed impact flow stress behavior of AM80 alloy under various deformation temperatures.

Key words： AM80 magnesium alloy deformation temperature dynamic mechanical response constitutive modeling

Published: 07 September 2021

CLC number:

TP182

Fund:National Natural Science Foundation of China (51905166),the Natural Science Foundation of Hunan Province, China (2019JJ50586) and the Research Foundation of Education Bureau of Hunan Province, China (18B193).

About author:: Feiyang Chenreceived his M. S. degrees in June 2021 from Central South University of Forestry and Technology. His research direction is the dynamic impact deformation behavior of magnesium alloys.
Pengcheng Guo received his Ph.D. degree in mechani-cal engineering from Hunan University in 2017. He is currently a lecturer in Central South University of Fo-restry and Technology. His research interests include multi-disciplinary and multi-objective optimization design of vehicle and forming technology of high strength steel and aluminum magnesium alloy for vehicle body.

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	CHEN Feiyang
	GUO Pengcheng
	HU Zehao
	MA Honghao
	ZHANG Liqiang

Cite this article:

CHEN Feiyang,GUO Pengcheng,HU Zehao, et al. Dynamic Mechanical Response and Constitutive Modeling of AM80 Magnesium Alloy at Various Temperatures[J]. Materials Reports, 2021, 35(16): 16093-16098.

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http://www.mater-rep.com/EN/10.11896/cldb.20060276 OR http://www.mater-rep.com/EN/Y2021/V35/I16/16093

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