Abstract
Phase constituents and properties of MCrAlY coating alloys play a crucial role in determining the performance of MCrAlY stand-alone overlay coatings and thermal barrier coating systems. Recent advances in computer modeling including access to involved thermodynamic databases make it possible to predict phase stabilities in these alloy systems. This article investigates the phase stabilities of a NiCrAlY coating alloy containing Re both experimentally and thermodynamically. The addition of Re promotes the formation of the Cr-rich α-phase that owns low coefficient of thermal expansion (CTE), and thereby decreases the CTE of the NiCrAlYRe coating alloy. In addition, the martensitic transformation of the B2 β-NiAl phase is investigated. This transformation has an important influence on the microhardness of the β-NiAl phase.
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This study was financially supported by the National Basic Research Program (973 Program) of China under Grant No. 2010CB631200 (2010CB631206) and the National Natural Science Foundation of China (NSFC) under Grant No. 50931004 and 51071164.
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Liang, J.J., Wei, H., Zhu, Y.L. et al. Phase constituents and thermal expansion behavior of a NiCrAlYRe coating alloy. J Mater Sci 46, 500–508 (2011). https://doi.org/10.1007/s10853-010-4953-y
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DOI: https://doi.org/10.1007/s10853-010-4953-y