摘要
采用Bc路径对超高强铝合金基复合材料7090/SiCp进行等径角挤压加工。采用金相显微镜、力学性能测试及扫描电镜,分析该复合材料的显微组织和力学性能。结果表明:经过4个道次的等径角挤压加工,该复合材料的晶粒逐渐被细化,第三道次后晶粒尺寸达到1μm以下;继续进行等径角挤压时,晶粒未发生明显变化。室温拉伸结果显示:晶粒的抗拉强度逐渐增大,在第三道次下道次间抗拉强度的增加幅度最大,达到14.3%,此时其抗拉强度及伸长率分别为338.57 MPa及15%;SiC颗粒在大的剪切力作用下被破碎细化,在基体中的分布也更加均匀。
The structures and properties of 7090/SiCp AI matrix composites were studied by severe plastic deformation through Bc route equal channel angular pressing （ECAP）. Equal channel angular pressing was performed on an ultra-high strength 7090/SiCp aluminum alloy matrix composite. By optical microscopy, mechanical tensile test and scanning electron microscopy, the microstructures and mechanical properties of 7090/SiCp composite were discussed. The results show that the size of the composites is fined gradually, and the finest grains are obtained of less than 1 um after 3 passes of ECAE However the grains do not change after the 4th pass of ECAE The tensile strength increases gradually with the addition of pass at room temperature, and the increasing degree between two passes achieves the maximum at the third pass, is 14.3%, and the ultimate tensile strength and elongation are 338.57 MPa and 15%, respectively. SiC particles are broken under high shearing stress, and the particle distribution in the matrix alloy is homogeneous.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第11期1964-1970,共7页
The Chinese Journal of Nonferrous Metals
基金
教育部新世纪优秀人才支持计划资助项目(NCET-06-0701)
湖南省重点实验室资助项目(06FJ3041)
关键词
铝基复合材料
SIC
等径角挤压
显微组织
力学性能
aluminum matrix composite
SiC
equal channel angular processing
microstructure
mechanical properties
