Pt+γ′-Ni3Al+γ-Ni/CMSX-4涂层结构的透射电镜研究

稀有金属材料与工程, 2012, 41(5): 847-850.

Pt+γ′-Ni3Al+γ-Ni/CMSX-4涂层结构的透射电镜研究

1.上海大学,上海200072

2.上海大学,上海200072

3.Ames Laboratory, US Department of Energy, Iowa State University, Ames, IA 50011-3020, USA; Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-2300, USA

基金项目: 国家自然科学基金(50771061) 上海市科学技术委员会(08PJ1405200;10JC1405100;09520703300)

关键词： γ′-Ni3Al+γ-Ni涂层 , TCP相 , 孪晶 , 透射电镜

TEM Characterization of Pt+γ′-Ni3Al+γ-Ni/CMSX-4 Coating Microstructure

通过在CMSX-4镍基单晶高温合金表面镀Pt然后采用包埋渗铝的方法成功制备Pt改性的Pt+γ′-Ni3Al+γ-Ni/CMSX-4涂层,采用扫描电镜和透射电镜研究Pt+γ′-Ni3Al+γ -Ni/CMSX-4涂层的微观结构.TEM分析表明Pt主要分布于涂层γ′-Ni3Al相中,且涂层γ′-Ni3Al相里存在{111}孪晶；此外涂层内还发现六方结构富铼的拓扑密堆相(μ相),点阵常数为a=0.473 nm和c=2.565 nm,首次发现μ相内除了(001)孪晶外还存在(102)孪晶；探讨μ相和孪晶的形成机制.

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