【摘要】 采用高温等温压缩变形方法 ,在温度为 3 73～ 673 K范围和应变速率为0 .0 0 1～ 1 .0 s- 1 范围内 ,测定了新型 Al- 1 0 Sn- 4 Si合金的流变应力曲线 .结果表明 ,该合金为正应变速率敏感材料并且具有稳态流变特征 ;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 .通过回归分析 ,建立了该合金高温塑性变形时稳态流变应力的半经验方程 .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 ,受热激活过程控制更多还原

【Abstract】 The true stress strain curves of plastic deformation for new Al 10Sn 4Si alloy were tested by isothermal compression loading at high temperatures with Gleeble 1500 machine. The flow stress in the compression process for the alloy was investigated in the temperature range of 373~673K and the strain rate range of 1.0~0.001s -1 . The results show that the plastic deformation process of the alloy have steady flow characteristics and the flow stress is sensitive to strain rate. In the steady state flow, the steady stress increased with the increasing of strain rate and the decreasing of temperature. The steady flow stress equations were established by regression analysis. It was found that the flow stress characteristics was closely related to dynamic recovery, re crystallization and sticky flow of local grain boundary, and the plastic flow was a thermally activated process governed by rate controlling mechanism of dislocation.更多还原