高压扭转制备SiC_p/Al复合材料的断裂行为  

Fracture behavior of SiC_p/Al composites prepared by high-pressure torsion

作　　者：马俊林[1] 李萍[1] 徐杰[1] 王成国[1] 刘雨生[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：《粉末冶金材料科学与工程》2016年第2期289-294,302,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51175138);教育部新世纪优秀人才支持计划项目(NCET-13-0765)

摘　　要：为了研究大塑性变形对颗粒增强复合材料断裂行为的影响规律,在不同高压扭转工艺(high-pressure torsion,HPT)工艺参数下制备SiC_p/Al复合材料,测量试样真应力-应变曲线和观察试样的断口形貌,并分析SiC-Al界面的EDS谱。在分析各参数下材料断口形貌和界面原子扩散的基础上,讨论颗粒增强复合材料的断裂机理。研究发现:SiC_p/Al复合材料包含韧性断裂和脆性断裂2种性质的断裂,断口韧窝的大小和数量与材料的工艺参数有关;HPT变形可以有效改善SiC颗粒与Al基体的界面连接强度,提高该类材料的断裂性质。基体内气孔和颗粒与基体间孔隙的连接是金属基复合材料的主要断裂机制。To investigate the influence of severe plastic deformation on the fracture behavior of the particulate reinforced composites, the SiCp/Al composites were prepared by using high-pressure torsion with different process parameters. The true stress-strain curves of samples were measured and the tensile fracture morphologies of samples were observed. EDS analyses of the SC-Al interface were analyzed. On the basis of both fracture morphologies and interfacial atomic diffusion, the fracture mechanism of the particulate reinforced composites was discussed. It is found that, the fracture in the SiCp/Al composites is both ductile and brittle, and the sizes and quantities in fracture dimples are associated with the deformation parameters. HPT can effectively improve the interfacial bonding strength between SiC particles and Al matrix, and the fracture properties for such materials can be improved as well. The connection between stomas in the matrix and pores that locate between the particles and the matrix is the major fracture site of the metal matrix composites.

关 键 词：高压扭转 SICP/AL复合材料 断口形貌 界面 断裂 

分 类 号：TB331[一般工业技术—材料科学与工程]