氧化铝体积分数对Al_2O_(3f)+C_f/ZL109混杂复合材料干滑动摩擦磨损行为的影响

EFFECT OF ALUMINA FIBER VOLUME FRACTION ON DRY SLIDING FRICTION AND WEAR BEHAV IOR OF ALUMINA AND CARBON SHORT FIBERS REINFORCED ALUMINIUM ALLOY HYBRID COMPOSI TES

利用挤压铸造法制备了Al2O3f+Cf/ZL109短纤维混杂金属基复合材料,并探讨了Al2O3纤维对该混杂复合材料干滑动摩擦磨损行为的影响。结果表明:混杂复合材料的摩擦系数以及从轻微磨损到急剧磨损转变的临界载荷均随着Al2O3体积分数的增加不断增大。在轻微磨损阶段,复合材料的主要磨损机制为犁沟磨损和层离,且Al2O3体积分数为12%时混杂复合材料的磨损率最低。发生严重磨损时,基体和复合材料的磨损机制均为严重的粘着磨损。

Alumina and carbon short fibers reinforced ZL109 aluminum alloy hybrid composite s were fabricated by squeeze casting.The effects of the alumina volume fraction on d ry sliding friction and wear properties of the hybrid composites with the fixed carbon fiber volume fraction 4 % were investigated.The results show that the ca rbon fiber is of self-lubricant in a certain degree,however,the friction coeffici ent of the h ybrid composites improves due to addition of alumina fiber and increases with th e increase of alumina fiber volume fraction.The transition load from mild wear to severe wear of the hybrid composites improves markedly because of the mutual effec t of alumina and carbon short fibers and increases with the increase of alumina f iber volume fraction.There exists a critical value of alumina fiber volume frac t ion which influences the wear property of the hybrid composites with the lowest we ar rate at the volume fraction of 12 % when the experimental load is below the t ransitio n load.Dominant wear mechanisms of composites are grooving wear and delaminatio n during mild wear.Whereas dominant wear mechanisms of matrix and composites wi ll be shifted to severe adhesion when the experimental load is above the transi tion load.