热处理对SiCp/7075Al复合材料组织与性能的影响  

Effects of heat treatment on microstructure and mechanical properties of SiCp/7075Al composites

作　　者：刘一雄[1] 郑振兴[1] 朱德智[2] 高吉祥[1] 曹耿华[1] LIU Yi-xiong1, ZHENG Zhen-xing1, ZHU De-zhi2, GAO Ji-xiang1, CAO Geng-hua1(1. School of Mechanical and Electronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China; 2. Guangdong Key Laboratory for Advanced Metallic Materials processing, South China University of Technology, Guangzhou 510640, China)

机构地区：[1]广东技术师范学院机电学院,广东广州510665 [2]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《材料热处理学报》2018年第9期1-6,共6页Transactions of Materials and Heat Treatment

基　　金：广东省普通高校青年创新人才项目(2016KQNCX094);广东省自然科学基金项目(2015A030313668);广东省科技计划项目(No.2017B090913006)

摘　　要：研究了不同热处理工艺对40 vol%含量SiC颗粒增强7075Al复合材料组织及性能影响。实验结果表明：SiC颗粒增强体没有改变基体合金中析出相的沉淀析出次序,但延迟了GP区的出现,并缩短了复合材料达到峰时效的时间;经峰时效处理与退火处理后复合材料的抗拉强度分别达到544 MPa与383 MPa。不同热处理工艺下复合材料基体合金中的位错组态以及析出相结构会对复合材料性能产生极大的影响。峰时效状态下,复合材料基体合金中同时存在的细针状沉淀相以及位错提高了复合材料的力学性能。而退火后,复合材料基体中形成了大量粗大的棒状沉淀相,并且位错基本消失,使得复合材料的力学性能降低。Effects of different heat treatment processes on microstructure and mechanical properties of 7075 Al composites reinforced with 40 vol% SiCp particles were investigated. The results show that the precipitation order of precipitated phase in the matrix alloy is not changed by the SiCp particles,but the appearance of GP region is delayed,and the peak aging time of the composites is shortened. The tensile strength of the composites after peak aging treatment and annealing treatment is 544 MPa and 383 MPa,respectively. The dislocation and the phase structure of the matrix alloy under different heat treatment conditions have great influence on the properties of the composites. In the peak-aging state,the fine needle-like precipitates and dislocations in the matrix alloy of the composites increase the mechanical properties of the composites. After annealing,a large number of rod-shaped precipitates are formed in the matrix of the composites,and the dislocation basically disappears,leading to the reduction of mechanical properties of the composites.

关 键 词：复合材料 时效 退火 组织 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]