30% SiC_p/Al复合材料热变形及动态再结晶行为  

Hot deformation and dynamic recrystallization behavior of 30% SiC_p/Al composite

作　　者：孙亚丽[1] 谢敬佩[1,2] 郝世明[3] 王爱琴[1,2] 柳培[1] 李敏[1] 

机构地区：[1]河南科技大学材料学院,洛阳471023 [2]有色金属共性技术河南省协同创新中心,洛阳471023 [3]河南科技大学物理与工程学院,洛阳471023

出　　处：《粉末冶金材料科学与工程》2016年第1期8-17,共10页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51371077);河南科技大学重大科技项目培育基金(2015ZDXM01)

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。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.

关 键 词：30%SiCp/Al复合材料 热变形 动态再结晶 临界应变 稳态应变 

分 类 号：TB333[一般工业技术—材料科学与工程]