SiC粒径对SiC_p/2024铝合金复合材料显微组织和力学性能的影响  

Effect of SiC Particle Size on Microstructure and Mechanical Properties of SiC_p/2024 Aluminum Alloy Composite

作　　者：顾建 李冬青 刘胜春 司佳钧 刘鹏 陈冉 曹振 GU Jian;LI Dongqing;LIU Shengchun;SI Jiajun;LIU Peng;CHEN Ran;CAO Zhen(China Electrie Power Research Institute,Bejing 102401,China;Bejing Institute of Graphene Technology,Beijing 100094,China)

机构地区：[1]中国电力科学研究院有限公司,北京102401 [2]北京石墨烯技术研究院有限公司,北京100094

出　　处：《机械工程材料》2020年第9期77-81,共5页Materials For Mechanical Engineering

基　　金：国家电网公司总部管理科技项目“基于新型陶瓷颗粒增强铝基复合材料的轻量化金具技术研究”(GC71-19-013)。

摘　　要：采用热等静压和热挤压工艺制备单一粒径(50,25,15,10μm)和混合粒径(10μm+25μm)SiCp/2024铝合金复合材料,并进行T4处理,研究了SiC粒径对复合材料显微组织和力学性能的影响;对性能最优的复合材料进行T6处理,研究了其组织和力学性能的变化。结果表明:添加单一粒径SiC时,随着粒径的减小,SiC颗粒在基体中的分布更加均匀,复合材料的抗拉强度增大,屈服强度、弹性模量、断后伸长率和布氏硬度变化不大;添加混合粒径SiC时,小粒径SiC会分布在大粒径颗粒周围,导致组织均匀性下降;混合粒径复合材料的抗拉强度介于对应单一粒径复合材料的之间,屈服强度略高于相应单一粒径复合材料的;粒径10μmSiCp/2024铝合金复合材料的性能较佳,再经T6处理后,其抗拉强度、屈服强度和布氏硬度进一步提高。SiC_p/2024 aluminum alloy composite, strengthened withsingle particle size(50, 25, 15, 10 μm) and mixed particle size(10 μm+25 μm) SiC, was prepared by hot isostatic pressing and hot extrusion, and then wasT4 t reated. Effect of SiC particle size on microstructure and mechanical properties of the composite was studied.T6 treatment was conducted on the composite having the best performance, and the change of the micro structure and mechanical properties was investigated. The results show that under condition of single particle size,with decreasing particle si ze, the SiC particles distributed more evenlyi n the matrix;the tensile strength of the composite increased while theyield stren gth, elasticity modulus, percentage elongation after fracture and Brinell hard nesschanged little. Under conditionof mixed particle size, the small-size SiC particles gathered aroud the largesizeparticl es, leading to the decrease of structure uniformity. The tensile strength of the mixed particle size composi tewas between thoseof the corresponding single particle size composites, and the yield strength was slight lyhigher than those of the corresponding single particle size composites. The 10 μm size SiC_p/2024 aluminum alloycomposite had relatively good performance, and after T6 treatment, the tensile strength, yield strength and Brinell har dness we re further improved.

关 键 词：SiC_p/2024铝合金复合材料 SiC粒径 显微组织 拉伸性能 

分 类 号：TB331[一般工业技术—材料科学与工程]