转速对压铸镁合金AZ91D摩擦磨损特性的影响

Effects of Rotating Speed on the Friction and Wear Behavior of Die Cast Magnesium Alloy AZ91D

采用MM-200型磨损试验机研究了转速对压铸镁合金摩擦磨损性能的影响,同时对其磨损机理进行了探讨。结果表明,转速越高,压铸镁合金的磨损损失越大、摩擦因数越小。低转速时,材料的磨损机制以磨粒磨损和氧化磨损为主;高速条件下,随着磨损时间的增加,其磨损机制已转化为以剥落磨损和熔化磨损为主。T6热处理改善了高速磨损条件下镁合金材料的耐磨性能。

Effects of different rotating speeds on friction and wear behavior of die cast magnesium alloy AZ91D have been investigated by using a MM-200 abrasive tester, and the wear mechanism has been described. The results show that with increasing the rotating speed, the weight loss of the alloy can be increased and the friction coefficient can be decreased. The oxidation wear and abrasive wear are dominant in the wear behavior of the alloys at low rotating speed while delamination wear and melted wear are dominant in ones with the increase of wear time at high rotating speed. The wear resistant of the alloys at high rotating speed can be greatly improved by T6 heat treatment.