以Al-Si共晶合金粉末为熔覆材料,在AZ91D镁合金表面进行了激光熔覆试验,利用光学显微镜（OM）、扫描电镜（SEM）、能谱仪（EDS）和X射线衍射仪（XRD）对激光熔覆层的组织、成分和相组成进行了分析,测试了激光熔覆层的显微硬度和磨损性能。结果表明,激光熔覆层由α-Mg过饱和固溶体和Mg17Al12、Mg2Si、Al3Mg2金属间化合物等相组成,且与基材之间形成了良好的冶金结合。由于激光熔覆层中存在金属间化合物析出相强化、细晶强化和固溶强化等多种强化作用,熔覆层的硬度比AZ91D合金提高了3#4倍,磨损量比AZ91D合金降低了72%。
Al-Si eutectic alloy coating was prepared by laser cladding on AZ91D magnesium alloy.Microstructure,phase components,microhardness and wear resistance of the laser clad layer was examined by means of optical microscope(OM) observation,scanning electronic microscopy(SEM),energy dispersive spectrometer(EDS) analysis,X-ray diffraction(XRD),microhardness and wear tests.The results show that the laser clad layer consists of supersaturated α-Mg solid solution,Mg17Al12,Mg2Si and Al3Mg2 intermetallics phases.Excellent metallurgical bond between the laser clad layer and substrate is obtained.Due to the effects of precipitated-phase strengthening,solution strengthening and fine-crystal strengthening,microhardness of the laser clad layer is improved three to four times and wear volume loss of the clad layer is reduced by 72% than those of the AZ91D alloy,respectively.
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