搅拌摩擦加工制备铝基复合材料组织性能研究  

Research on Microstructure and Performance of Aluminum Matrix Composite by Friction Stir Processing

作　　者：金玉花[1] 温雨[1] 李常锋[1] 黄振有 王希靖[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点试验室,甘肃兰州730050

出　　处：《热加工工艺》2014年第16期115-119,共5页Hot Working Technology

基　　金：甘肃省自然基金(0710RJZA055;1014RJZA002);硕导基金(1201ZTC028)

摘　　要：采用搅拌摩擦加工法制备铝基SiC复合层,研究不同加工道次下SiC颗粒在复合层中的分布形态,并对复合层的组织形貌和显微硬度进行分析。结果表明:加工次数的增加,有利于复合层中SiC颗粒的均匀分布,经4道次搅拌摩擦加工后复合层中SiC颗粒分布均匀,基体金属组织中粗大Si相和枝晶完全消失,组织被明显细化。增强相SiC颗粒的加入使复合层显微硬度得到提高,4道次加工后搅拌摩擦中心区显微硬度最高值为71 HV,较基体金属(45HV)提高了26 HV,搅拌摩擦区的显微硬度平均值为68HV,为基体金属显微硬度(45HV)的1.5倍。The friction stir processing was used for the preparation of SiC composite layer of aluminum substrate. The distribution characteristics of SiC particles in composite layer under different processing passes was studied. The microstructure and microhardness of the composite layer were analyzed. The results show that： the increase of processing time is beneficial for the uniform distribution of SiC particles in the composite layer. Therefore, SiC particles of the composite layer uniform distribute after 4 times of friction stir processing, and the coarse Si phase and dendritic crystal completely disappear;Moreover, the microstructure was obviously refined. The microhardness of the composite layer obviously improves after adding SiC particles. The center microhardness is 71 HV after 4 times of friction stir processing, which increase by 26 HV compared with the base metal（45HV）. The microhardness of friction stir zone is 68 HV, which is as 1.5 times higher as the base metal hardness（45HV）.

关 键 词：搅拌摩擦加工 复合层 SIC颗粒 显微硬度 

分 类 号：TB333[一般工业技术—材料科学与工程]