锻压技术

2195铝锂合金的热变形行为及本构方程研究

英文标题：Study on thermal deformation behavior and constitutive equation of 2195 Al-Li alloy

分类号：TG146.2

出版年,卷(期):页码：2023,48(9):239-247

摘要：

采用Gleeble3800型热模拟试验机，对均匀化态2195铝锂合金进行变形温度为340~500 ℃、应变速率为0.001~10 s-1的热压缩变形处理，考察了摩擦对流变应力的影响并建立了流变应力本构方程，对比分析了考虑应变补偿的2195铝锂合金的流变应力与摩擦修正后的流变应力。结果表明，均匀化态2195铝锂合金中的枝晶偏析明显消除，晶内和晶界处第二相基本回溶至基体，晶界处有少量鱼骨状Al6(CuFeMn)相；摩擦修正后的流变应力要小于实测应力，不同变形温度和应变速率下的2195铝锂合金的应力实测值与流变应力本构方程预测值有较好的相关性（相关系数R2=0.97）；考虑应变补偿的2195铝锂合金的流变应力预测值与摩擦修正后的流变应力预测值吻合较好，相关系数R2=0.9913，平均相对误差Δ=1.60%，表明基于摩擦修正和应变补偿的流变应力本构方程具有较高的准确性。

Using thermal simulation testing machine Gleeble-3800, the homogenized 2195 Al-Li alloy was subjected to thermal compression deformation at the deformation temperature of 340-500 ℃ and the strain rate of 0.001-10 s-1, the influence of friction on the rheological stress was investigated, the rheological stress constitutive equation was established, and the rheological stress of 2195 Al-Li alloy considering strain compensation and the rheological stress after friction correction were compared and analyzed. The results show that the dendrite segregation in the homogenized 2195 Al-Li alloy is obviously eliminated, the second phase in the grain and at the grain boundary is basically dissolved back into the matrix, and there is a small amount of fishbone Al6(CuFeMn) phase at the grain boundary. The rheological stress after friction correction is smaller than the measured stress, the measured stress values of 2195 Al-Li alloy at different deformation temperatures and strain rates have a good correlation with the predicted values of the rheological stress constitutive equation (correlation coefficient R2=0.97). The predicted values of rheological stress of 2195 Al-Li alloy considering strain compensation is in good agreement with that of rheological stress after friction correction, the correlation coefficient R2 is 0.9913, and the average relative error Δ is 1.60%, indicating that the rheological stress constitutive equations based on friction correction and strain compensation have high accuracy.

基金项目：

河南省科技攻关项目(192102310244)；机械工程智能化科研创新团队项目（HNACKT2020-04）

张义俊（1974-），女，博士，副教授 E-mail：yijun7402@sina.com

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