Pt＋γ′-Ni_3Al＋γ-Ni/CMSX-4涂层结构的透射电镜研究  

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

作　　者：操光辉[1] 姚培培[1] Russell Alan M. 

机构地区：[1]上海大学,上海200072 [2]Ames Laboratory, US Department of Energy, Iowa State University, Ames, IA 50011-3020, USADepartment of Materials Science and Engineering, Iowa State University, Ames, IA 50011-2300, USA

出　　处：《稀有金属材料与工程》2012年第5期847-850,共4页Rare Metal Materials and Engineering

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

摘　　要：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=0.473nm和c=2.565nm,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。Pt+γ'-Ni3Al+γ-Ni/CMSX-4 coatings were fabricated by Pt electroplating on CMSX-4 single crystal superalloys substrate and followed by an aluminizing pack cementation process.The microstructure of the Pt+γ'-Ni3Al+γ-Ni/CMSX-4 coating was studied by scanning electron microscopy(SEM) and transmission electron microscopy(TEM),TEM investigation showed that {111} twinning exists in the γ'-Ni3Al phase,Pt was mainly distributed in the γ'-Ni3Al.Precipitates were observed in the coatings.Selected area electron diffraction(SAED) reveals that the precipitate was the hexagonal topologically close-packed(TCP) μ phase with lattice parameters a=0.473 nm,and c=2.565 nm.Twin domains parallel to(001) and(10 2) twinning were found in the μ phase and their formations were discussed.

关 键 词：γ′-Ni3Al+γ-Ni涂层 TCP相 孪晶 透射电镜 

分 类 号：TG132.32[一般工业技术—材料科学与工程]