Identification by Electron Probe Microbeam Analysis of Submicron Borides in Joints of Nickel Base Superalloys |
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Authors: | Céline Pascal Claude Merlet Rose-Marie Marin-Ayral Jean-Claude Tedenac Bernard Boyer |
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Institution: | (1) Laboratoire de Physicochimie de la Matière Condensée, (L.P.M.C., UMR5617), France;(2) Institut des Sciences de la Terre de lEau et de lEspace de Montpellier, (ISTEEM), France;(3) Université Montpellier II, Place Eugène Bataillon, F-34095 Montpellier Cedex, France |
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Abstract: | The phases formed at the interface between an intermetallic (NiAl) and a nickel base superalloy joined by combustion synthesis were investigated, particularly the eutectic phases. Owing to their small size, the characterisation of these phases using a Castaings electron microprobe encounters difficulties. The analysis volume size is generally too large to differentiate the phases from their surrounding matrix, even by using low accelerating voltage. Moreover, the eutectic phases contain boron, which is difficult to characterise by EPMA. Independently of the phases shape, the characterisation can be solved by viewing this complex system as a surrounding matrix and a multi layer system. The results of these simulations revealed the presence of two categories of borides: the eutectic boride MM2B2 (M=Mo and M=Co, Cr) and the solid solution boride Cr1–x (Mo, W)x]B. |
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Keywords: | : Microstructure electron probe microanalysis superalloys boride |
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