添加石墨/Al2O3和SiC颗粒对搅拌摩擦加工技术制备6061-T6铝基复合材料磨损性能的影响

摘要

Aluminum alloy base surface hybrid composites were fabricated by incorporating with mixture of (SiC+G0 and (SiC+Al2O3) particles of 20 μm in average size on an aluminum alloy 6061-T6 plate using friction stir processing (FSP).Microstructures of both the surface hybrid composites revealed that SiC,Gr and Al2O3 are uniformly dispersed in the nugget zone (NZ).It was observed that the addition of Gr particles rather than Al2O3 particles with SiC particles,decreases the microhardness but immensely increases the dry sliding wear resistance of aluminum alloy 6061-T6 surface hybrid composite.The observed microhardness and wear properties are correlated with microstructures and worn micrographs.%采用搅拌摩擦加工技术,将平均粒径为20 μm的(SiC+石墨)或(SiC+Al2O3)混合粉末掺入到6061-T6铝合金板中,制备铝基表面混杂复合材料.组织观察结果表明,SiC、石墨和Al2O3颗粒均匀分散于铝基表面复合材料的焊合区中.与添加Al2O3和SiC相比,添加石墨和SiC颗粒虽然使表面复合材料的显微硬度有所降低,但却使其磨损性能得到显著提升.对复合材料的显微组织和磨损表面进行了分析.