Study by complementary X-ray techniques of in-depth microstructure in Ni-based superalloys after Pt diffusion treatment

• Published in: Surface & coatings technology Vol. 161; no. 2; pp. 200 - 209
• Main Authors: Benoist, J, Girardeau, T, Goudeau, P, Badawi, K.F, Traverse, Agnès
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 02.12.2002; Elsevier
• Subjects: Applied sciences; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Metals. Metallurgy; Microstructure; Nickel-based superalloy; Physics; Pt diffusion; Structure and morphology; thickness; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thin film structure and morphology; Microstructure; Nickel-based superalloy; Pt diffusion; Nickel base alloys; Platinum; XRD; Diffusion; Experimental study; Superalloys; Layer thickness; Depth profiles; Photoelectron spectroscopy; EXAFS
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/S0257-8972(02)00559-5

The in-depth microstructure changes in nickel-based superalloy due to prior Pt diffusion treatment have been analyzed using complementary X-ray methods. X-Ray diffraction shows the presence of a three-phase system in the entire treated thickness for thick Pt coatings (10 μm). Surface probing by X-ray absorption spectroscopy reveals the presence of a Pt-based phase at the top surface. For thinner Pt coatings (5 μm), X-ray diffraction and absorption techniques reveal a homogeneous in-depth microstructure associated with the γ/γ′ Ni-based superalloy phases. Results obtained for these two thickness values are well correlated with in-depth Pt concentration profiles determined by energy-dispersive X-ray analysis (EDX).