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采用双层辉光等离子表面冶金技术在γ-TiAl合金表面进行Ni-Cr共渗处理,形成均匀致密的Ni-Cr合金层,通过SEM、EDS、XRD等对其渗层显微组织、化学成分和相结构进行分析,并测试了合金层的显微硬度及耐磨性。结果表明,合金层有效渗层厚度为25μm,主要由Cr2 Ti、AlTi、Cr、NiTi2、Cr1.75 Ni0.25 Ti等相组成;合金层中合金元素Cr和Ni由表及里呈梯度分布,合金层与基体结合牢固;合金层的显微硬度、动态硬度及摩擦磨损性能显著高于基体。
The surface of γ-TiAl alloy was treated with Ni-Cr by double-layer glow plasma surface metallurgy to form uniform and dense Ni-Cr alloy layer. The microstructure and chemical composition of the layer were characterized by SEM, EDS and XRD. And phase structure analysis, and tested the microhardness and wear resistance of the alloy layer. The results show that the effective layer thickness of the alloy layer is 25μm, which is composed mainly of Cr2Ti, AlTi, Cr, NiTi2, Cr1.75Ni0.25Ti and other phases. The alloying elements Cr and Ni in the alloy layer are gradient distributed from the surface to the surface, The alloy layer is firmly bonded to the substrate; the microhardness, dynamic hardness and friction and wear properties of the alloy layer are significantly higher than that of the substrate.