LZ92镁锂合金流变应力预测模型  

Flow stress prediction model of LZ92 magnesium lithium alloy

作　　者：姜炳春[1,2] 卢立伟 文泽军[2] 李真真 JIANG Bing-chun;LU Li-wei;WEN Ze-jun;LI Zhen-zhen(Department of Mechanical and Electrical Engineering,Guangdong University of Science&Technology,Dongguan 523083,China;Hunan Provincial key Laboratory of Health Maintenance for Mechanical Equipment,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Defense Laboratory of High Temperature Wear-resisting Materials and Preparation Technology,Hunan University of Science and Technology,Xiangtan 411201,China;School of Materials Science andEngineering,Central South University,Changsha 410083,China)

机构地区：[1]广东科技学院机电工程学院,广东东莞523083 [2]湖南科技大学机械设备健康维护重点实验室,湖南湘潭411201 [3]湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室,湖南湘潭411201 [4]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料热处理学报》2020年第9期147-154,共8页Transactions of Materials and Heat Treatment

基　　金：广东省普通高校青年创新人才类项目(2019KQNCX228);湖南省自然科学基金优秀青年项目(2019JJ30010);广东科技学院重点项目(GKY-2016KYYB-4)。

摘　　要：采用Gleeble-1500热模拟机获得了LZ92镁锂合金在变形温度为210~300℃、应变速率为0.001~1 s^-1条件下真应力-真应变曲线,利用多元回归方法构建基于应变的LZ92镁锂合金流变应力预测模型。结果表明:流变应力受应变速率和变形温度影响,流变应力随着变形温度的升高而下降,且随着应变率的增加而增大。此模型能够较好地描述LZ92镁锂合金的热变形行为特征。经实验对比验证,该模型预测流变应力的精度较高,平均相对误差为6.73%,相关系数为0.98。The true stress-true strain curves of LZ92 magnesium lithium alloy at deformation temperature of 210-300℃and strain rate of 0.001-1 s^-1were obtained by using a Gleeble-1500 thermal simulator,and a strain-based flow stress prediction model of the LZ92 magnesium lithium was established by using multivariate regression method.The results show that the flow stress is affected by the strain rate and deformation temperature,and the flow stress decreases with the increase of deformation temperature,and increases with the increase of strain rate.The model can better describe the thermal deformation behavior characteristics of the LZ92 magnesium lithium alloy.By comparing with experimental results,the model shows high accuracy in predicting flow stress,and the average relative error is 6.73%and the correlation coefficient is 0.98.

关 键 词：LZ92镁锂合金 热变形 本构模型 变形激活能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]