摘要
通过在电子蠕变试验机上进行蠕变时效试验,研究了2524铝合金在时效温度为453～473K、试验应力为140～210MPa条件下的蠕变时效行为;采用包含双曲正弦函数的方程,通过对试验数据的线性回归分析,建立了2524铝合金稳态蠕变速率与试验应力及时效温度之间的关联本构模型。结果表明:随着试验应力增大和时效温度升高,2524铝合金的稳态蠕变速率增大,且蠕变曲线在第二阶段持续的时间缩短;依据本构方程计算出该铝合金在各条件下的稳态蠕变速率的数值和试验值的平均相对误差为6.9%,该本构方程可为2524铝合金蠕变时效成形工艺的制定提供依据。
The creep ageing behavior of 2524 aluminum alloy was studied at ageing temperature range trom 453 K to 473 K and stress range from 140 MPa to 210 MPa using electronic creep testing machine. By adopting the equations including hyperbolic sine function and by linear regression analysis of experimental data, the constitutive relationship among steady creep strain rate, tested stress and ageing temperature of 2524 aluminum alloy was obtained. The results show that steady creep rate increased with the increase of tested stress and ageing temperature, and the second step in creep curves became short. The relative error of steady creep strain rate between theoretical value computed by the constitutive equation and actual value was only 6. 9%, and the constitutive equation could provide theoretical basis for formulating creep ageing forming processing of 2524 aluminum alloy.
出处
《机械工程材料》
CAS
CSCD
北大核心
2013年第5期92-96,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金重点资助项目(2010CB731702)
关键词
2524铝合金
蠕变时效
稳态蠕变速率
本构方程
2524 aluminum alloy
creep ageing
steady creep strain rate
constitutive equation
