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为提高钛合金TC4的室温力学性能和抗高温氧化性能,采用激光表面合金化技术在钛合金TC4表面进行铝合金化,氮气作为保护气体,并对合金化层的组织结构、硬度、摩擦磨损性能及抗高温氧化性能进行分析测试。结果表明,在钛合金TC4成功制备出由弥散分布的氮化物作为增强相的富铝合金化层,合金化层厚度约为1 mm,并与基体呈良好的冶金结合。室温下测得的合金化层的平均硬度约为740 HV,平均摩擦系数为0.28,而基体的硬度约为410 HV,平均摩擦系数为0.8。静态空气中800℃保温1000 h的氧化结果表明,合金化层的氧化产物主要为Al_2O_3和TiO_2以及少量的Al_3Ti_5O_2的混合氧化物,单位面积增重5.16×10~(-3)mg/mm~2,而基体氧化产物主要为TiO_2,单位面积增重为1.821×10~(-1)mg/mm~2。氮化物作为弥散增强相的富铝合金化试样的室温力学性能和抗高温氧化性能显著提高。
In order to improve the room temperature mechanical properties and high temperature oxidation resistance of titanium alloy TC4, the laser surface alloying technology was used to carry out aluminum alloying on titanium alloy TC4 and nitrogen as the protective gas, and the microstructure, hardness, friction and wear properties And high temperature oxidation performance analysis and testing. The results show that the alloyed layer with the dispersed phase nitride as the reinforcing phase is successfully prepared in the TC4 titanium alloy. The thickness of the alloyed layer is about 1 mm and the metallurgical bond with the substrate is good. The average hardness of the alloyed layer measured at room temperature was about 740 HV, the average coefficient of friction was 0.28, and the hardness of the substrate was about 410 HV and the average coefficient of friction was 0.8. The results of oxidation in static air at 800 ℃ for 1000 h showed that the oxidation products of the alloyed layer were mainly mixed oxides of Al 2 O 3 and TiO 2 and a small amount of Al 3 Ti 5 O 2 with a weight gain of 5.16 × 10 -3 mg / mm 2 , While the main oxidation products of the substrate were TiO_2, the weight gain per unit area was 1.821 × 10 ~ (-1) mg / mm ~ 2. The properties of room temperature mechanical properties and high temperature oxidation resistance of the Al-rich alloy with nitride as the dispersion-enhancing phase were significantly improved.