3D打印Ti骨架增强AZ31B复合材料的制备及磨损性能研究

Preparation and Wear Properties of 3D Printed Ti Skeleton Reinforced AZ31B Composites

采用选区激光熔化技术(SLM)打印出多孔Ti预制体骨架,将液态AZ31B镁合金通过无压浸渗的方法填充在Ti预制体骨架内部的空隙之中,制备出结构致密、界面结合良好的复合材料。通过在多功能摩擦磨损试验机(UTM-3)上对AZ31B合金与复合材料的磨损性能进行表征。同时采用带有EDS能谱的扫描电子显微镜对材料的磨损形貌进行观察。结果表明,较软的AZ31B合金耐磨性差,其磨损机制主要是磨粒磨损与黏着磨损,同时在磨损过程中伴有氧化现象。与AZ31B合金相比,Ti/AZ31B复合材料中因为Ti骨架的存在显著提高了材料的耐磨性能,其磨损机制主要是微量的磨粒磨损与黏着磨损。

Select laser melting(SLM)technique was used to print the porous titanium preform skeleton.The liquid AZ31B magnesium alloy was filled into the interstitial space of the titanium preform skeleton by non-pressure infiltration.Thus,composite materials with dense structures and good interface bonding were prepared.The wear properties of AZ31B alloy and composites were characterized on a multifunctional friction and wear testing machine(UTM-3).The wear morphology of the materials was observed by scanning electron microscope(SEM)with EDS.The results show that the wear resistance of soft AZ31B alloy is poor,and the wear mechanism is mainly abrasive wear and adhesive wear.Oxidation is associated with the wear process.Compared with AZ31B alloy,the wear resistance of Ti/AZ31B composites is significantly improved due to the presence of a Ti skeleton.The wear mechanism is mainly abrasive wear and adhesive wear.