碳化硅颗粒增强铝基复合粉末等通道转角挤扭的致密行为  

Study on densification behavior of SiCp/Al metal matrix composite during equal channel angular extrusion and twist process

作　　者：董飞[1] 李萍[1] 薛克敏[1] 钱陈豪[1] 李凌风[1] 王成国[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《塑性工程学报》2014年第3期36-40,共5页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51175138);安徽省自然科学基金资助项目(1308085JGD02);高等学校博士学科点专项基金资助项目(20100111110003)

摘　　要：对碳化硅颗粒增强铝基复合材料进行等通道挤扭实验和模拟,研究粉体在变形过程中的致密行为。结果表明,SiCp/Al复合粉末材料在等通道转角挤扭工艺中通过3个剪切面和7个变形区能得到有效致密。ECAPT过程中材料所处的球应力和切应力的叠加状态,是材料孔隙得到有效致密的关键。变形过程中,SiC颗粒被剪切细化,促进了团簇颗粒的分散和孔隙的致密。TE通道的剪切作用能使SiC颗粒进一步细化,但材料的整体致密度略有下降。ECAPT experiment and finite element simulation were carried out for the SiCp/Al metal matrix composite . The densi-fication behavior has been studied . The results show that the SiCp/Al metal matrix composite could be compact after three shear-ing surface and seven deformed zones . The analysis shows that the key factor to obtain high density is the composite of large shear plastic deformation and high hydrostatic stress during ECAPT . According the the shearing , the SiC particle was refined , which contributed to the scatter of the cluster and the densification of pore . The shearing of TE also can refine the SiC particle further , while the density of the composite decreases a little .

关 键 词：铝基复合材料 等通道转角挤扭 致密行为 

分 类 号：TG376.5[金属学及工艺—金属压力加工]