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针对镁合金表面耐磨性差的问题,采用预置粉末法对AZ31B镁合金表面进行激光合金化Al-Cu粉末试验。通过扫描电子显微镜(SEM)、X射线衍射(XRD)仪、显微硬度计、摩擦磨损试验机对合金化涂层的相组成、微结构及性能进行了分析。结果表明,涂层与基体呈冶金结合、组织均匀致密、呈网状结构;涂层中除了有α-Mg、β-Al12Mg17外还含有CuMg2,且β-Al12Mg17含量远高于基体材料;涂层的显微硬度由50HV提高到210～265HV,为基体的4～5倍,相对耐磨性为2.5。
Aiming at the problem of poor wear resistance of magnesium alloy surface, laser alloying Al-Cu powder test on AZ31B magnesium alloy surface was carried out by the method of preset powder. The phase composition, microstructure and properties of alloying coatings were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness tester and friction and wear tester. The results show that the coating is metallurgically bonded with the substrate and the microstructure is uniform and dense with a network structure. The coating contains CuMg2 in addition to α-Mg and β-Al12Mg17, and the content of β-Al12Mg17 is much higher than that of the matrix. Of the microhardness increased from 50HV 210 ~ 265HV, 4 to 5 times the matrix, the relative wear resistance of 2.5.