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用搅拌摩擦加工法处理原位自生TiB2/7075复合材料,分析了经过不同加工道次的复合材料的微观结构、拉伸性能。结果表明:经过搅拌摩擦加工,搅拌区内的复合材料晶粒细小,颗粒大团聚被打散,颗粒在微米尺度分布更为均匀,同时消除了在制备过程中产生的浇铸缺陷。在搅拌区内复合材料的晶粒直径由45μm细化到2μm。与一道次加工相比,经过四道次搅拌摩擦加工的复合材料,其微观组织形貌更为均匀。缺陷的消除以及微观组织的改变,使复合材料搅拌区的拉伸性能得到显著提高,四道次加工的材料断裂强度为母材的1.3倍,而延伸率则为母材的8倍。
The in-situ TiB2 / 7075 composites were treated by friction stir processing, and the microstructure and tensile properties of the composites after different passes were analyzed. The results show that after the friction stir processing, the composite grains in the agitation zone are fine and the agglomeration of the particles is broken up, the particles are more evenly distributed on the micrometer scale, and the casting defects generated in the preparation process are eliminated. The grain size of the composite in the agitation zone was refined from 45 μm to 2 μm. Compared with a single processing, after four times friction stir processing of composite materials, the microstructure and morphology more uniform. The elimination of defects and the change of microstructure resulted in a significant improvement of the tensile properties of the composite materials. The fracture strength of the four-pass material was 1.3 times that of the base material and the elongation was eight times that of the base material.