干摩擦条件下Al18B4O33晶须增强AC4C铝基复合材料的摩擦磨损特性

利用环－块磨损试验机，在干摩擦条件下研究了铸态与Ｔ６处理态Ａｌ１８Ｂ４Ｏ３３晶须增强ＡＣ４Ｃ铝基复合材料的摩擦磨损行为。结果表明：与铸态复合材料相经，Ｔ６处理态复合材料的耐磨性较差；晶须与基体间的界面化学反应影响复合材料的摩擦磨损特性，在本文试验载荷范围内，复合材料发生了由轻度磨损向严重磨损的转化；在高载荷下，除 了产生擦伤和粘着，在表层和次表层发生的应变硬化还会导致界面开裂、晶须断裂和分离；在低

Friction and Wear Properties of Al 18 B 4O 33 Whisker reinforced AC4C Al Alloy Matrix Composites under Dry Sliding Conditions

The steady state friction and wear behavior of the as cast and T6 treated Al 18 B 4O 33 whisker reinforced AC4C Al composites was investigated with a block on ring apparatus under dry sliding conditions. The results indicate that the interfacial reaction between the whisker and the matrix influences the friction and wear of the composites. In the tested load range, all materials undergo a transition from mild wear to severe wear. Severe interfacial cracking and fracture and detachment of whisker occur due to the strain hardening of the surface and subsurface layer under the high load,accompanied by scuffing and adhesion. Compared with the as cast composite, T6 treated composite with reduced whisker hardness and strength and brittle and weak whisker matrix interface has relatively low wear resistance. Under low load and sliding speed,increasing in sliding speed induces an increase in wear rate and coefficient of friction. However,with further increasing in the sliding speed,the oxide film formed on the worn sufrace and the strain hardening of the surface layer contribute to decrease wear rate and coefficient of friction.