HPT法对SiCp/Al复合材料颗粒断裂的影响  

Effect of high-pressure torsion on particle fracture of SiCp-Al composites

作　　者：贺鹏[1] 薛克敏[1] 王成国[1] 李萍[1] 石文超[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》2015年第2期117-120,137,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)

摘　　要：采用高压扭转(HPT)法将SiC颗粒与纯Al粉的混合物固结成金属基复合材料。观察试样的显微组织,并对颗粒的数目、粒径及百分比进行测量,研究HPT法对SiCp/Al复合材料颗粒断裂的影响。结果表明,随着扭转半径增大,颗粒断裂现象严重,颗粒棱角钝化更加明显,颗粒数目增加,粒径减小;随着SiC颗粒体积分数的增加,这种趋势会强化;颗粒断裂现象是高压扭转法制备颗粒增强金属基复合材料的固有属性。The mixtures of SiC particles and pure Al powder were fabricated into metal matrix composites by high‐pressure torsion （HPT ） .Effect of high‐pressure torsion on particle fracture of SiCp/Al composite was investigated by observing the microstruc‐ture of the samples and measuring the number ,size and percentage of particles .The results show that ,with the increase of the twisting radius ,the particle fracture phenomenon is more serious ,the angular of particles greatly passivated ,the particle number increases ,and the particle size decreases ;This trend will be strengthened with the increase of the volume fraction of SiC particles ;The particle fracture is inherent properties of the particulate reinforced metal matrix composites prepared by high‐pres‐sure torsion .

关 键 词：等效粒径 SICP/AL复合材料 高压扭转法 剪切应变 

分 类 号：TB331[一般工业技术—材料科学与工程] TG376[金属学及工艺—金属压力加工]