摘要
在温度范围为623~723K,应变速率为0.0001s^-1、0.001s^-1、0.01s^-1的条件下对5A90-T3S铝-锂合金薄板进行等温拉伸试验,得到相应的真实应力应变曲线。研究5A90-T3S铝-锂合金在该变形条件下的流变行为,分析其应变硬化机制。运用基于双曲正弦函数的Arrhenius本构模型得到流变应力与温度、应变速率等参数之间的定量关系。将模型预测值与试验值进行对比,并进行误差分析。结果表明:试验值与预测值的最佳相关性系数可达到0.998,平均相对误差可达到4.08%。表明可以使用Arrhenius模型来预测5A90-T3S铝-锂合金的流变行为。
The isothermal tensile tests were conducted in the temperature range from 623 K to 723 K, and at strain rates of 0.0001 s^-1 ,0.001 s^-1 and 0.01s^-1 for 5A90-T3S Al-Li alloy. The corresponding true stress-strain curves were obtained. The flow behavior of 5 A90-T3S Al-Li alloy was studied and its strain hardening mechanism was analyzed. Arrhenius constitutive models with different stress ranges were constructed by hyperbolic sine model. The quantitative relationship of stress with temperature and strain rate were obtained respectively. The predicted values were compared with the ex perimental values, and the error analysis was carried out. The results show that the correlation coefficient of the flow stress between the experimental value and the predicted value is up to 0. 998 , and the average relative error can be 4. 08%, which indicates that the Arrhenius model can be used to predict the flow behavior of 5 A90-T3S Al-Li alloy.
作者
汪冠宇
马贵春
Wang Guanyu;Ma Guichun(College of Mechanical & Electrical Engineering, North University of China, Taiyuan 030051 , China)
出处
《轻金属》
北大核心
2019年第8期51-56,共6页
Light Metals
