摘要
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。
Nickel-chromizing layer was formed on γ-TiAl alloy surface by double glow plasma surface metallurgy.The microstructure,chemical composition and phase structure of alloying layer was analysed by SEM,EDS and XRD.The microhardness and wear resistance of alloying layer was also tested.The results show that the diffusion thickness of alloying layer is about 25 μm,and the phase structure of nickel-chromizing layer is Cr2Ti,AlTi,Cr,NiTi2 and Cr1.75Ni0.25Ti.The Ni and Cr element content in alloying layer decreased gradually from surface to substrate.The alloying layer and the matrix binds tightly.The microhardness,dynamic hardness and the friction and wear resistance of the alloying layer are greatly improved compared with matrix.
出处
《金属热处理》
CAS
CSCD
北大核心
2012年第3期58-61,共4页
Heat Treatment of Metals
基金
航空科学基金项目(2007ZE52057)
江苏省普通高校研究生科研创新计划项目
