摘要
采用等温热压缩实验研究含有AlLi相的Mg−5Li−3Al−2Zn(LAZ532)合金的热变形行为;变形温度和应变速率范围分别为473~623 K和0.001~1 s^(−1)。LAZ532合金热变形过程中AlLi相能够阻碍位错运动,从而显著提高合金的峰值应力值。为精确预测LAZ532合金的热变形行为,构建相应的应变补偿Arrhenius本构模型,预测结果与实验结果吻合良好。基于Murty准则,建立相应的热加工图,合理的加工区域在538~623 K和0.001~0.01 s^(−1)范围内。在高应变速率变形条件下,AlLi相不利于LAZ532合金在热压缩过程中的流动稳定性和动态再结晶。此外,变形温度会改变LAZ532合金的动态再结晶形核机制。
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.
作者
甘翼
胡励
时来鑫
陈强
李明骜
向林
周涛
Yi GAN;Li HU;Lai-xin SHI;Qiang CHEN;Ming-ao LI;Lin XIANG;Tao ZHOU(College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;Southwest Technology and Engineering Research Institute,Chongqing 400039,China)
基金
the National Natural Science Foundation of China(Nos.51822509,51701034)
the Scientific and Technological Research Program of Chongqing Municipal Education Commission,China(Nos.KJQN201801137,KJQN201901106)
the Basic and Advanced Research Project of CQ CSTC,China(No.cstc2018jcyjAX0035).
作者简介
Corresponding author:时来鑫,Tel:+86-15123376156,E-mail:shilaixin2016@cqut.edu.cn;Corresponding author:陈强,Tel:+86-15002389047,E-mail:2009chenqiang@163.com。
