摘要
在Gleeble-3800热模拟机上对2A12铝合金进行了高温压缩实验,获得了该铝合金在350~500℃和0.001~5 s-1变形速率下的真应力-真应变曲线。实验结果表明：初始阶段真应力随应变速率的增大而增大,应力在峰值后缓慢下降并逐渐保持平稳;当变形温度恒定时,真应力峰值随应变速率的增大而增大;当应变速率恒定时,真应力峰值随变形温度的升高而减小。根据实验数据,使用Origin软件采用一元线性回归的方法计算了2A12铝合金在热成形过程中的材料参数值：激活能、应力强度参数、结构因子及应力指数。
The high temperature compression test of 2A12 aluminum alloy was done on the Gleeble-3800 thermal simulation machine. True stress-strain curves were obtained at 350-500℃ and 0.001-5s-1strain rate. The experimental results show that the true stress increases with the increase of strain rate in initial stage,and after the stress arrives the peak, the stress begins to descend slowly and gradually remaines stable;when the deformation temperature is constant, the peak of the true stress increases with the increase of strain rate; when the strain rate is constant, the peak of the true stress decreases with the increase of deformation temperature. According to the experimental data,using the method of linear regression, material parameters values（the energy of activation, the stress intensity parameter, the structural factor and the stress exponent） of2A12 aluminum alloy in the heat forming process were calculated by using the Origin software.
出处
《热加工工艺》
CSCD
北大核心
2016年第1期131-133,137,共4页
Hot Working Technology
基金
重庆文理学院研究生科研项目经费资助项目(M2013ME07)
重庆理工大学研究生创新基金资助项目(YCX2013235)
关键词
2A12铝合金
材料参数值
热压缩实验
热成形
计算
2A12 aluminum alloy
material parameter
hot compression test
hot forming
calculation
