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利用Gleeble3500热模拟试验机对6061铝合金进行高温拉伸实验,研究变形温度为365℃~565℃和应变速率为0.01s-1~1s-1条件下6061铝合金的高温拉伸流变行为。结果表明,6061铝合金属于正应变速率敏感材料,流变应力随应变速率的增加而增大,随温度的增加而降低;通过线性回归分析计算6061铝合金的应力指数n及变形激活能Q,获得其高温拉伸条件下的流变应力本构方程。
The high temperature tensile test of 6061 aluminum alloy was carried out by using Gleeble3500 thermal simulation test machine to study the high temperature tensile rheological behavior of 6061 aluminum alloy under the conditions of deformation temperature of 365 ℃ ~ 565 ℃ and strain rate of 0.01s-1 ~ 1s-1. The results show that the 6061 aluminum alloy belongs to the positive strain rate sensitive material and the flow stress increases with the increase of strain rate and decreases with increasing temperature. The stress index n and deformation activation energy Q of 6061 aluminum alloy are calculated by linear regression analysis. The rheological stress constitutive equation under high temperature tensile condition was obtained.