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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 SiC-SiC composite layer was prepared by friction stir processing. The distribution of SiC particles in the composite layer was studied under different processing pass. The microstructure and microhardness of the composite layer were analyzed. The results show that the increase of the number of processing is conducive to the uniform distribution of SiC particles in the composite layer. After 4 times of friction stir processing, the distribution of SiC particles in the composite layer is uniform and the coarse Si phase and dendrite disappear completely in the matrix metal structure. Refine. The microhardness of the composite layer increased with the addition of SiC particles. After 4 passes, the highest microhardness of the friction stir center was 71 HV, and the HV of the composite was increased by 26 HV compared with that of the matrix metal (45 HV) The average hardness of 68HV, the base metal microhardness (45HV) of 1.5 times.