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Analytical TEM and SEM characterisation of aluminide coatings on nickel based superalloy CMSX-4

机译：镍基高温合金CMSX-4上铝化物涂层的分析TEM和SEM表征

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摘要

Aluminide coatings are applied on gas turbine components to improve oxidation and corrosion resistance or as bond coats for thermal barrier coatings (TBC). In the present study, coatings produced on a CMSX-4 superalloy by pack gas phase aluminising and subsequently annealed at 1050°C for 2 h were investigated. Microstructure, morphology and phase composition of the coating were characterised using light microscopy, X-ray diffraction, scanning electron microscopy and analytical transmission electron microscopy (TEM). Scanning electron microscopy (SEM) investigations of the 39 µm thick coating revealed a complex multilayered microstructure produced by diffusion at 1050°C at the surface of CMSX-4 alloy. Detailed TEM phase analysis was performed on cross-section thin foils by electron diffraction and energy dispersive X-ray spectrometry (EDS). The outer zone (1) consisted of β-NiAl phase. The interdifusion zone (2) contained two sublayers consisting of a Ni5Al3 matrix with precipitates of topologically close packed phases, most probably σ and µ. Close to the surface of the CMSX-4 superalloy, a further zone (3) consisting of γ+γ′ with large precipitates (possibly µ and P phases) was observed.
机译：铝化物涂层应用于燃气轮机部件上，以提高抗氧化性和耐腐蚀性，或作为热障涂层（TBC）的粘结层。在本研究中，研究了通过气相气相渗铝在CMSX-4高温合金上制备的涂层，然后在1050°C退火2小时。使用光学显微镜，X射线衍射，扫描电子显微镜和分析透射电子显微镜（TEM）对涂层的微观结构，形态和相组成进行了表征。扫描电子显微镜（SEM）对39 µm厚涂层的研究表明，在1050°C下CMSX-4合金表面扩散产生了复杂的多层微观结构。通过电子衍射和能量色散X射线光谱法（EDS）对横截面薄箔进行了详细的TEM相分析。外部区域（1）由β-NiAl相组成。互扩散区（2）包含两个亚层，由Ni 5 Al 3 基质组成，并且具有拓扑密堆积相的沉淀，最有可能是σ和µ。靠近CMSX-4高温合金的表面，观察到另一个由γ+γ'组成的区域（3），该区域具有大的析出物（可能是μ和P相）。

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