【摘要】 在Gleeble-1 500D热模拟机上采用等温压缩实验研究30%SiC_p/Al复合材料的高温压缩变形行为,获得该材料在温度为623⁷73 K,应变速率为0.01-10 s^-1的条件下的真应力-应变曲线,并在考虑摩擦和变形热效应的基础上对真应力-应变曲线进行修正。对修正后的峰值应力进行线性回归,建立该材料的本构方程。根据材料动态模型,计算并建立30%SiC_p/Al复合材料的热加工图,据此确定热变形流变失稳区。在应变速率为0.01 s^-1时,随热变形温度升高,该复合材料发生动态再结晶的体积分数增加。更多还原

【Abstract】 The hot deformation behavior of 30%SiC_p/Al composite was investigated by compression tests with Gleeble-1500 D simulation machine.The true strain-stress curves in the temperature range of 623-773 K and strain rate of 0.01-10 s^-1 were obtained.The true strain-stress curves were corrected in consideration of the friction and deformation.The constitutive equation of 30%SiC_p/Al composite was established by the linear regression of the peak stress.The processing map was calculated and analyzed according to the dynamic materials model.The process of hot deformation in the temperature range and different strain rates can be attained by the processing map,and the instability zones of flow behavior can be recognized.The volume fraction of dynamic recrystallization increases with the increase of the temperature when the strain rate is 0.01 s^-1.更多还原