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研究了不同热处理条件下Al-Si-Cu合金的力学性能、显微组织及磨损性能.结果表明:与铸态合金相比,T6态合金的晶粒最为细小,Si、Al2Cu和Al Fe Mn Si第二相尺寸变小、变圆整且分布均匀,其力学性能和耐磨性能最好.当载荷小于500 N时,T6态和铸淬态合金的耐磨性能相当,二者表现为磨粒磨损;载荷为500~1 000 N时,Si相受水平方向塑性流变应力作用均匀分布在磨面表面,改善了润滑效果使摩擦系数降低,虽然开始向黏着磨损机制转变,但合金仍保持了较好的耐磨性能;载荷大于1 000 N时,Si相和Al2Cu相周围出现了微裂纹和严重的撕裂状的塑性变形,摩擦系数增大,逐步向剥层磨损转变,合金耐磨性能显著下降.
The mechanical properties, microstructure and wear properties of Al-Si-Cu alloys under different heat treatment conditions were studied.The results show that the grains of T6 alloy are the smallest and the grains of Si, Al2Cu and AlFeMnSi The second phase size becomes smaller, rounded and evenly distributed, the mechanical properties and wear resistance of the second phase is the best.When the load is less than 500 N, the wear resistance of the T6 state and the as-cast alloy is the same, Wear. When the load is 500-1 000 N, the Si phase is uniformly distributed on the grinding surface by the horizontal plastic flow stress, which improves the lubrication effect and reduces the friction coefficient. Although the transformation to the adhesive wear mechanism is started, the alloy maintains Good wear resistance. When the load is more than 1 000 N, micro-cracks and severe tearing plastic deformation occur around the Si phase and Al2Cu phase, the friction coefficient increases, and the wear of the layer gradually changes. The wear resistance of the alloy Decreased significantly.