采用自制电火花强化机,以TC4合金作为电极,在空气介质中对LY12铝合金进行了表面强化.分别用扫描电镜、电子能谱分析仪与X射线衍射仪对强化层的组织、成分与结构进行了分析与研究;用显微硬度计与磨损试验机等实验设备对强化层的显微硬度与耐磨性进行了测量与分析.结果表明:强化层连续、致密,与基体之间呈冶金结合;主要由钛-铝金属间化合物和钛或铝的氮、氧化物相组成,显微硬度可达HV596;在干摩擦磨损实验条件下,强化后试样磨损体积仅为未强化试样的1/7.铝合金表面性能得到显著改善.
The LY12 alloy surface was strengthened by electrospark system in air medium, with Ti6Al4V titanium alloy as electrode. The microstructure, element distribution and phase construction of strengthened coating were analyzed by scanning electron microscopic,energy-dispersive spectrum and X-ray diffractometer respectively. Furthermore, the microhardness distribution and wear resistance of strengthened coating contrast to LY12 substrate were studied by microhardness tester and abrasion tester respectively. The results show that excellent metallurgical bonding between the coating and the substrate is obtained. The coating is mainly composed of Ti-Al intermetallic compounds and Ti/Al oxides and nitrides, the microhardness can reach HV596. Compared with the LY12 alloy substrate, the wearing volume loss of strengthened samples is just one seventh. The surface performance of LY12 alloys is dramatically improved.
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