论文部分内容阅读
采用等温压缩试验法 ,测定了新型Al- 10Sn - 4Si合金高温变形过程的真应力—真应变曲线 ;在温度为 10 0～ 40 0℃范围和应变速率为 0 0 0 1～ 1 0s 1范围的变形条件下 ,研究了该合金的流变应力变化规律 .结果表明 ,Al- 10Sn - 4Si合金为正应变速率敏感材料 ,表现出稳态流变特征 :稳态流变阶段 ,流变应力基本保持不变 ;稳态流变应力随变形速率的增加而增大 ,随变形温度的升高而降低 .进一步分析表明 ,这种稳态流变特征与动态回复、动态再结晶及局部晶界粘滞性流动行为有关 ,受热激活过程控制 .通过回归分析 ,得出了该合金高温塑性变形时稳态流变应力的半经验方程
The true stress - true strain curves of the Al - 10Sn - 4Si alloy were measured by isothermal compression test at high temperature. At the temperature range of 10 0 ~ 40 0 ℃ and strain rate of 0 0 0 ~ 1 0s 1 The results show that the Al-10Sn-4Si alloy is a positive strain rate sensitive material and exhibits steady-state rheological characteristics: the steady-state rheological stage, the flow stress is basically maintained Steady flow stress increased with the increase of deformation rate and decreased with the increase of deformation temperature.Further analysis showed that the steady-state rheological characteristics and dynamic recovery, dynamic recrystallization and local grain boundary viscosity Which is controlled by the process of heat activation.According to the regression analysis, the semi-empirical equation of the steady-state flow stress of the alloy under high temperature plastic deformation is obtained