(南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 210016)
摘 要: 對Ti6Al4V(TC4)合金表面進(jìn)行機(jī)械合金化處理，在Ti6Al4V表面制備Ti-Cu非晶涂層。利用SEM、 EDX和XRD等檢測手段對涂層的顯微組織與物相成分進(jìn)行分析，通過摩擦磨損試驗(yàn)、顯微硬度測試和劃痕試驗(yàn)分別對涂層截面的顯微硬度、涂層的摩擦耐磨性能及結(jié)合強(qiáng)度進(jìn)行分析測試。分析結(jié)果表明：適當(dāng)延長球磨時間可提高涂層的非晶化程度和致密度；當(dāng)球磨時間達(dá)到11 h時，涂層最為致密，涂層厚度為40 μm，且此時涂層與基體之間發(fā)生元素互擴(kuò)散而形成冶金結(jié)合；涂層截面的顯微硬度呈梯度變化，涂層的顯微硬度最大值達(dá)593 HV0.1；涂層的摩擦因數(shù)和磨損量均較TC4基體的有顯著減小，球磨11 h后，涂層的摩擦因數(shù)為0.18，磨損量為0.8 mg；涂層的結(jié)合強(qiáng)度亦隨著球磨時間的延長而增加，球磨11 h后，涂層結(jié)合強(qiáng)度為44.6 N。
關(guān)鍵字: Ti-Cu非晶涂層；機(jī)械合金化；顯微組織；摩擦；磨損；顯微硬度；結(jié)合強(qiáng)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
