作　　者： (姜炳春）; (李真真）; ;

机构地区： 广东科技学院

出　　处： 《兵器材料科学与工程》 2020年第4期90-94,共5页

摘　　要： LZ92镁锂合金在210~300℃、0.001~1 s^-1条件下进行等温压缩试验,分析合金流变行为,根据应力峰值建立合金的热变形本构方程。结果表明:应力峰值随变形温度升高而减小,随应变率增大而增大。该本构方程能较好预测合金的应力峰值,变形激活能Q为108291.51 J/mol。试验验证,该本构方程预测的应力峰值精度较高,平均相对误差为8.55%,相关系数为0.98。 The isothermal compression test of LZ92 magnesium lithium alloy was carried out at the temperature range of 210-300℃and strain rate of 0.001-1 s^-1.The rheological behavior of the alloy was analyzed,and the constitutive equation of thermal deformation of the alloy was established according to the peak stress.The results show that the peak stress decreases with the increase of deformation temperature and increases with the increase of strain rate.The constructed constitutive equation model of LZ92 magnesium-lithium alloy,predicts the peak stress peak well.The deformation activation energy Q is 108291.51 J/mol.It is proved by experiments that the predicted stress peaks by the constitutive equations have high accuracy,the average relative error is 8.55%and correlation coefficient is 0.98.

关 键 词： 镁锂合金 热变形 本构模型 变形激活能

领　　域： [一般工业技术—材料科学与工程] [金属学及工艺—金属材料] [金属学及工艺—金属学]