5050铝合金板材高温流变行为研究

High Temperature Rheological Behavior of Aluminum Alloy Sheet 5050

在303~673K的温度范围内和应变速率为0.001~0.1s-1下对5050铝合金薄板进行高温拉伸试验,研究了5050铝合金高温拉伸性能,以及该合金在升温条件下流变应力与变形温度、应变速率之间的关系。结果表明：5050铝合金的流变应力随温度的升高而降低,随应变速率的升高而升高;高温拉伸试样的伸长率随变形温度的升高而升高,随应变速率的增大而减小。同时使用改进了的Hooke law和Grosman方程建立了5050铝合金在高温拉伸时应力-应变本构模型。

The warm tensile tests for 5050 aluminum alloy sheet metal were carried out at elevated temperature and different strain rates.The temperature was 303-673K and the strain rate was 0.001-0.1s-1.The warm tensile properties,relation between temperature,strain rate and the flow stress were studied.The results show that the flow stress declines with the increase of temperature and the decrease of strain rates.Elongation increases with the increase of temperature and the decrease of strain rates.Furthermore,constitutive equations under warm tension are obtained based on Hooke law and Grosman equation.