(南京航空航天大学 材料科学与技术学院，南京 210016)
摘 要: 对Ti6Al4V(TC4)合金表面进行机械合金化处理，在Ti6Al4V表面制备Ti-Cu非晶涂层。利用SEM、 EDX和XRD等检测手段对涂层的显微组织与物相成分进行分析，通过摩擦磨损试验、显微硬度测试和划痕试验分别对涂层截面的显微硬度、涂层的摩擦耐磨性能及结合强度进行分析测试。分析结果表明：适当延长球磨时间可提高涂层的非晶化程度和致密度；当球磨时间达到11 h时，涂层最为致密，涂层厚度为40 μm，且此时涂层与基体之间发生元素互扩散而形成冶金结合；涂层截面的显微硬度呈梯度变化，涂层的显微硬度最大值达593 HV0.1；涂层的摩擦因数和磨损量均较TC4基体的有显著减小，球磨11 h后，涂层的摩擦因数为0.18，磨损量为0.8 mg；涂层的结合强度亦随着球磨时间的延长而增加，球磨11 h后，涂层结合强度为44.6 N。
关键字: Ti-Cu非晶涂层；机械合金化；显微组织；摩擦；磨损；显微硬度；结合强度
（College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China）
Abstract:The Ti-Cu amorphous coatings on Ti6Al6V (TC4) substrates were prepared by mechanical alloying. The microstructures, elemental and phase compositions of the mechanically alloyed coatings at different milling durations were studied by SEM, EDX and XRD. The studies on micro-hardness, friction and wear and adhesion strength behavior of the coatings were performed. It is found that a proper increase in the applied milling time enhances the densification and non-crystallization level of the coatings. The coating at a milling time of 11 h is almost fully dense and amorphous with a thickness of 40 μm. The inter-diffusion at the coating interface occurs to form a metallurgical bonding between the coatings and the substrates. The micro-hardness from the top surface to the inner substrate at the section of the coating decreases gradually. The maximum micro-hardness of the coating reaches 593 HV0.1. The friction coefficients of the substrates with coatings are obviously lower than those of the TC4 substrates. At a milling time of 11 h, the friction coefficient of the coating is 0.18 and the corresponding wear mass loss is 0.8 mg. The adhesion strength between the coatings and the substrates is improved with increasing milling durations and reaches the maximum value of 44.6 N at a milling time of 11 h.
Key words: Ti-Cu amorphous coating; mechanical alloying; microstructure; friction; wear; microhardness; adhesion strength
