ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 33    No. 5    May 2023

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Effect of AlLi phase on deformation behavior and dynamic recrystallization of Mg-Li alloy during hot compression
Yi GAN1, Li HU1, Lai-xin SHI1, Qiang CHEN2, Ming-ao LI1, Lin XIANG2, Tao ZHOU1
(1. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;
2. Southwest Technology and Engineering Research Institute, Chongqing 400039, China
)
Abstract: Hot deformation behavior of Mg-5Li-3Al-2Zn (LAZ532) alloy with AlLi phase was studied by using isothermal hot compression experiments at the deformation temperature of 473-623 K and the strain rate of 0.001-1 s-1. AlLi phase could significantly increase the peak stress of LAZ532 alloy during hot deformation because of its obstructing effect on the movement of dislocation. A relevant strain-compensated Arrhenius constitutive model was constructed to predict the hot deformation behavior of LAZ532 alloy, and the predicted results were in good agreement with experimental ones. The corresponding hot processing maps were established based on the Murty criterion, and the optimal processing domain was located in the range of 538-623 K and 0.001-0.01 s-1. At the high strain rate, AlLi phase was not beneficial for the flow stability and dynamic recrystallization of LAZ532 alloy during hot compression. In addition, deformation temperature would change the nucleation mechanism of the dynamic recrystallization of LAZ532 alloy.
Key words: Mg-Li alloy; AlLi phase; constitutive model; processing map; dynamic recrystallization
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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