The effect of grain refinement on the adhesion of an alumina scale on an aluminide coating |
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| Affiliation: | 1. Université de Toulouse, Institut Carnot Chimie Balard CIRIMAT, INPT-ENSIACET, 4 Allée Emile Monso, BP 44362, 31030 Toulouse Cedex 4, France;2. National Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan;1. Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;2. College of Materials Science and Engineering, Central South University, Changsha 410083, China;3. College of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing 100124, China;1. Pacific Northwest National Laboratory, Richland, Washington 99352, USA;2. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA |
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| Abstract: | To understand the effect of grain refinement on the thermally grown alumina scale adhesion to the metal substrate, two δ-Ni2Al3 coatings, one coarse-grained (～70 μm) and the other ultrafine-grained (generally below ～500 nm), were prepared. The cyclic oxidation in air at 1100 °C shows that the ultrafine-grained (UFG) coating is better oxidation resistant than the coarse-grained (CG) coating due to the formation of a more adherent alumina scale. The latter is intrinsically correlated with the fact that the aluminide grain refinement helps to increase the oxide/metal strength through a route to prevent the formation of large-sized voids at the interface. |
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| Keywords: | A Metal coatings B SEM B TEM B XRD C Oxidation |
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