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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:与铸态复合材料相比,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;在低载荷及低滑动速度下,速度增大导致磨损率和摩擦系数提高,随着滑动速度的进一步增大,在磨损表面生成的氧化膜和表层的应变硬化作用有助于降低复合材料的磨损率和摩擦系数
The tribological behavior of AC4C aluminum matrix composites reinforced by as-cast and T6-treated Al18B4O33 whiskers was studied by ring-block wear tester under dry friction conditions. The results show that compared with as-cast composites, the T6 treated composites The wear resistance of the composites is poor. The interfacial chemical reaction between the whiskers and the matrix affects the friction and wear properties of the composites. During the experimental loading range, the composites undergo mild wear to severe wear transformation. Under high load In addition to the occurrence of galling and sticking, strain hardening at the superficial and subsurface layers can also lead to interface cracking, whisker rupture and separation; at low loads and at low sliding speeds, increasing the speed leads to an increase in the wear rate and the friction coefficient, With the further increase of the sliding speed, the strain hardening effect of the oxide film and the surface layer generated on the worn surface helps to reduce the wear rate and the friction coefficient of the composite material