Materials Reports  2022, Vol. 36 Issue (Z1): 21120147-5 |
| METALS AND METAL MATRIX COMPOSITES |
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| Research on Hot Deformation Behavior of As-cast Mg-2Y-0.8Mn-0.6Ca-0.5Zn Magnesium Alloy |
| CAO Zhaoxun, WANG Jun, LIU Chen, HAN Jungang, WANG Yinyang, ZHONG Liang, WANG Rong, XU Yongdong, ZHU Xiurong
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| Ningbo Branch of Chinese Academy of Ordnance, Ningbo 315103, Zhejiang, China |
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Abstract Gleeble3500 thermal simulation testing machine was used to conduct hot compression deformation test on as-cast Mg-2Y-0.8Mn-0.6Ca-0.5Zn magnesium alloy. The hot deformation temperature and strain rate were 375—450 ℃ and 0.001—5 s-1respectively.The true stress-strain curve was drawn by using the test data. And the constitutive equation and thermal processing diagram of the hyperbolic sine function were constructed. At the same time, the microstructure changes of the materials after different thermal deformation temperatures and strain rates were analyzed.The activation energy and the stress index of hot compression deformation of the as-cast Mg-2Y-0.8Mn-0.6Ca-0.5Zn magnesium alloy were Q=230.32 kJ/mol and n=4.348 respectively. The predicted ideal thermal deformation temperature and strain rate region of as-cast Mg-2Y-0.8Mn-0.6Ca-0.5Zn magnesium alloy are respectively 410—450 ℃ and 0.03—0.25 s-1, and the power dissipation coefficient of this variable region is 30%—38%. In the thermal processing diagram, the distribution of recrystallized grains in the thermal deformation stable region is relatively uniform, and the distribution of thermal deformation recrystallized grains in the rheological instability region is uneven.
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Published: 05 June 2022
Online: 2022-06-08
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| Fund:Ningbo Science and Technology Innovation 2025 Major Special Project (2019B10103) |
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