喷射沉积SiC_p/7090Al复合材料固溶组织及力学性能  

Microstructure and mechanical properties of spray co-deposition SiCp/7090Al composite after solution treatment

作　　者：孙有平[1,2] 严红革[2] 何江美[1] 陈刚[2] 

机构地区：[1]广西工学院机械工程系,广西柳州545006 [2]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《金属热处理》2011年第1期60-64,共5页Heat Treatment of Metals

基　　金：教育部新世纪优秀人才支持计划项目(NCET-06-0701);国家高技术研究发展计划(863计划)(2009AA03Z111);广西工学院博士基金(院科博1003)

摘　　要：采用多层喷射共沉积技术制备了S iCp/7090A l复合材料锭坯,对其进行了热挤压变形,研究了固溶处理对复合材料显微组织及力学性能的影响。结果表明,挤压态S iCp/7090A l复合材料的基体合金中存在大量短棒状的MgZn2相及圆形的CuA12相颗粒,晶粒内部的MgZn2粒子长约200 nm,直径约60 nm;晶粒内的CuA l2相为直径40~420 nm的球形粒子,主要分布在晶界或近晶界区域。确定了最佳固溶温度为475℃,固溶时间为1 h。经过固溶处理后,析出相颗粒MgZn2及CuA l2粒子溶入到基体,复合材料棒材的力学性能为：σb=610 MPa,δ=2.0%。SiCp/7090Al composite was prepared by multi-layer spray co-deposition process and then deformed by hot extrusion,and the effect of solution treatment on microstructure and mechanical properties of the composite material was studied.The results show that there are a large amount of short rod-like MgZn2 and spherical CuA12 particles in the matrix of the as-extruded SiCp/7090Al composite.The length of MgZn2 particles in the grains is about 200 nm,the width of that is about 60 nm,while the CuA12 particles are mainly distributed at grain boundaries or the near areas with the diameter from 40-420 nm.The best solid solution process for the composite is solutionized at 475 ℃ for 1h.The particles of MgZn2 and CuAl2 are dissolved after the solid solution treatment and the ultimate strength and elongation of the composite rod are 610 MPa and 2.0% respectively.

关 键 词：喷射沉积 复合材料 固溶处理 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]