| γ-TiAl合金表面辉光等离子Ni-Cr共渗层的组织与性能 |
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| 引用本文： | 黄勇,张平则,魏东博,黄俊.γ-TiAl合金表面辉光等离子Ni-Cr共渗层的组织与性能[J].金属热处理,2012,37(3):58-61. |
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| 作者姓名： | 黄勇 张平则 魏东博 黄俊 |
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| 作者单位： | 南京航空航天大学材料科学与技术学院,江苏南京,210016 |
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| 基金项目： | 航空科学基金项目，江苏省普通高校研究生科研创新计划项目 |
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| 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。
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| 关 键 词： | γ-TiAl合金 双辉等离子表面冶金 Ni-Cr合金层 组织与性能 |
Microstructure and properties of nickel-chromizing layer on γ-TiAl alloy surface by double-glow plasma technique |
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| HUANG Yong,ZHANG Pingze,WEI Dongbo,HUANG Jun.Microstructure and properties of nickel-chromizing layer on γ-TiAl alloy surface by double-glow plasma technique[J].Heat Treatment of Metals,2012,37(3):58-61. |
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| Authors: | HUANG Yong ZHANG Pingze WEI Dongbo HUANG Jun |
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| Affiliation: | (College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing Jiangsu 210016,China) |
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| Abstract: | 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. |
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| Keywords: | γ-TiAl alloy double glow plasma surface metallurgy nickel-chromizing layer microstructure and property |
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