【摘要】 为了提高镁合金的磨损性能,采用激光熔覆技术在AZ91D镁合金表面熔覆了Zr-Cu-Ni-Al/TiC复合粉末,制备出TiC和原位合成ZrC共同增强的Zr基非晶复合涂层。采用X射线衍射(XRD)和扫描电子显微镜(SEM)技术研究了熔覆层的组织;并利用干滑动磨损方法评价了涂层的耐磨性。研究结果表明,熔覆层组织主要由非晶和金属间化合物组成;在非晶相和金属间化合物复合作用下,熔覆层表现出优异的耐磨性;且随着TiC含量的增加,耐磨性得到进一步的提高。涂层和基材AZ91D的主要磨损机制不同,前者是疲劳剥落和黏着磨损,后者是磨料磨损。更多还原

【Abstract】 To improve the wear property of magnesium alloy,wear-resistant TiC and in-situ ZrC co-reinforced Zr-based amorphous composite coating can be fabricated on AZ91D magnesium alloy by laser cladding using mixed powders Zr-Cu-Ni-Al/TiC.The microstructure of the coating was characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM).The wear resistance of the coating was evaluated under dry sliding wear test condition at room temperature.The results show that the coating mainly consists of amorphous and different intermetallic phases.The coating exhibits excellent wear resistance due to the recombination action of amorphous and intermetallic compounds.And the wear resistance was improved further with the increase of TiC content.The main wear mechanism of the coating and the AZ91D sample are different,the former is fatigue peeling and adhesive wear and the latter is abrasive wear.更多还原