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基于熔体状态的改变,文中研究了熔体混合与T6处理对多元过共晶Al-18%Si合金组织与干摩擦磨损性能的影响。结果表明,经熔体混合处理后初晶硅显著细化,金属型凝固条件下其晶粒尺寸由36μm减小到10.3μm,并且棱角钝化。添加Sr元素可同时变质共晶硅为纤维状,热处理后共晶硅球化。合金经过熔体混合与T6热处理后,磨损量降低38.9%,耐磨性能与磨损形貌得到显著改善,其主要与熔体混熔引起初晶硅的细化及热处理弥散析出相引起合金强度的提高有关。
Based on the change of melt state, the effect of melt mixing and T6 treatment on the microstructure and dry friction and wear properties of mulit hypereutectic Al-18% Si alloy was studied. The results show that the primary Si is significantly refined after melt mixing, and its grain size decreases from 36μm to 10.3μm under metal-type solidification conditions, and the cornerstone is passivated. The addition of Sr can modify the eutectic silicon into a fibrous shape at the same time, and the eutectic silicon becomes spherical after the heat treatment. After the alloy was melt-mixed with T6 heat treatment, the wear loss decreased by 38.9%, the wear resistance and wear morphology were significantly improved, the main and melt melt caused by the primary Si refinement and heat treatment dispersion precipitated phase caused by the alloy strength Improve related.