激光冲击强化AZ31镁合金摩擦磨损性能的研究

Friction and Wear Properties of AZ31 Magnesium Alloy by Laser Shock Processing

采用高能脉冲激光束对AZ31镁合金进行激光冲击强化(LSP)处理,利用UMT-2摩擦磨损试验机对试样进行磨损实验,通过分析磨痕表面和磨屑形貌及磨屑能谱,得出LSP技术可提高AZ31镁合金的耐磨性能。在相同条件下,LSP AZ31镁合金摩擦系数和磨损量均比未冲击试样小,且磨屑更为细小,表明LSP对AZ31镁合金摩擦磨损性能有一定的改善效果。另外,AZ31镁合金经过LSP后,磨损机理由以剥落磨损为主转变为以磨粒磨损为主。

AZ31 magnesium alloy is treated by laser shock processing（LSP） using high-energy pulse laser beams.The dry-sliding wear tests of untreated and treated samples by LSP are conducted on the UMT-2 sliding wear tester.LSP can improve the wear resistance of AZ31 magnesium alloy through analyzing the micrographs of samples′ worn surfaces and worn debris and energy dispersive spectra of worn debris. Under the same conditions, friction coefficients and mass loss of AZ31 magnesium alloy treated by LSP are both significantly lower than untreated samples and the debris are even finer, which indicates that LSP can improve the wear resistance of AZ31 magnesium alloy. Besides, the friction mechanism of AZ31 magnesium alloy treated by LSP turns from delaminate wear into abrasive wear.