摘要
为了研究微米级碳化硅颗粒(SiCp)尺寸对中体积分数SiCp增强铝基复合材料的拉伸性能与强化机制的影响,用粉末冶金工艺制备体积分数为30%的SiCp/2024Al复合材料,利用OM,SEM,万能材料试验机等对材料微观结构和拉伸性能进行了研究。结果表明,复合材料的拉伸强度随着SiCp尺寸的减小而增大。当SiCp尺寸为3μm时,复合材料的断裂主要以界面处的基体合金撕裂为主;当SiCp尺寸为25μm和40μm时,复合材料的断裂以SiCp解理断裂为主;当SiCp尺寸为8μm和15μm时,复合材料的断裂方式是以界面处的基体合金撕裂和SiCp的断裂共同作用。3μm SiCp增强复合材料相对密度不高、SiCp分布不均匀但其拉伸强度最大,主要原因为受力时小SiCp极少断裂和小颗粒效应导致基体的显微组织强化。
In order to study the effects of micrometer SiCp size on tensile properties and strengthening mechanism of SiCp reinforced aluminum matrix composites, SiCp/2024AI composites was fabricated by powder metallurgy technique, and microstructure of the composites was observed by OM, SEM and its tensile properties were measured. The results show that strength of the composites increases with decreasing SiCp particle size. When the particle size is 3 μm, the fracture of the material is caused by tearing of matrix near interface. The failure of the composites with SiCp size of 25 μm and 40 μm results from cracking of the SiCp. When the particle size is 8 p,m and 15 μm, the failure of the composite occurs by combination mechanism of tearing of matrix near interface and cracking of the SiCp. The SiCp of 3 μm reinforced composites has maximum tensile strength despite its relative density is low and distribution is heterogeneous. The main reason is due to the rarely fracture of small SiCp and the higher strengthening effect of the small SiC particles on the matrix.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第2期13-18,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金项目(51371077)
河南省国际科技合作基金项目(084300510006)
关键词
金属基复合材料
颗粒尺寸
拉伸性能
强化机制
粉末冶金
metal matrix composites
particle size
tensile property
strengthening mechanism
powder metallurgy
