论文部分内容阅读
针对铝合金表面硬度低和易磨损的问题,采用超音速微粒沉积技术在5083铝合金表面制备了Ti-45Al-7Nb-4Cr合金涂层。利用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对涂层微观形貌和物相组成进行了观察和分析,并对比测试了5083铝合金、Ti-45Al-7Nb-4Cr合金铸锭和涂层的显微硬度和摩擦学性能。结果表明:Ti-45Al-7Nb-4Cr合金涂层内部颗粒间存在冶金结合和机械嵌合2种结合方式,涂层与5083铝合金基体的结合方式为机械嵌合;涂层主要相组成为γ-Ti Al、α2-Ti3Al和β-Ti相;通过在5083铝合金表面制备Ti-45Al-7Nb-4Cr合金涂层,显微硬度提高4倍以上,磨损体积减少69%以上;涂层的磨损机理为磨料磨损和氧化磨损,具有较好的耐磨性能。
Aiming at the problem of low hardness and easy wear on aluminum alloy, Ti-45Al-7Nb-4Cr alloy coating was prepared on 5083 aluminum alloy by supersonic particle deposition technology. The microstructure and phase composition of the coating were observed and analyzed by scanning electron microscopy (SEM) and X-ray diffractometer (XRD), and the effects of 5083 aluminum alloy, Ti-45Al-7Nb-4Cr alloy ingot and Coating microhardness and tribological properties. The results show that there are two kinds of metallurgical bonding and mechanical bonding between Ti-45Al-7Nb-4Cr alloy coating and the mechanical bonding of 5083 aluminum alloy substrate. The main phase composition of coating is γ -Ti Al, α2-Ti3Al and β-Ti phases. The microstructure of Ti-45Al-7Nb-4Cr alloy coated with 5083 aluminum alloy was improved by more than 4 times and the wear volume decreased by 69% Mechanism of abrasive wear and oxidation wear, with good wear resistance.