【摘要】 采用Gleeble-1500D热模拟试验机研究30%SiCp/Al复合材料在温度为623~773 K、应变速率为0.01~10 s-1下的热变形及动态再结晶行为。结果表明:材料的高温流变应力-应变曲线主要以动态再结晶软化机制为特征,峰值应力随变形温度降低或应变速率升高而增大,材料热激活能为272.831 k J/mol。以试验数据为基础,建立q-s和?q/?s-s曲线,从而进一步获得动态再结晶的临界应变和稳态应变,通过试验数据的回归分析,建立动态再结晶的临界应变模型和稳态应变模型,并在此基础上,获得所需要材料的动态再结晶图。更多还原

【Abstract】 Using Gleeble-1500 D simulator, the high-temperature plastic deformation behavior and dynamic recrystallization behavior of 30% Si Cp/Al composite were investigated at 623-773 K with strain rate of 0.01-10 s-1. The results show that the high-temperature flow stress-strain curves of the composite has softening characteristics of the dynamic recrystallization, and the peak stress increases with the decrease of deformation temperature or the increase of strain rate. Based on the true stress-strain curves, the activation energy of the composites is 272.831 k J/mol. In the study, ??? and ??????? curves are plotted based on the experimental data to furtherly obtain the critical strain and steady-state strain of DRX. Then the critical strain model and the steady-state strain model of DRX are set up by regression analysis of experimental data. Based on the results, the diagram of DRX for 30% Si Cp/Al composite was given.更多还原