A novel ultrafine-grained Ni3Al with increased cyclic oxidation resistance |
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| Authors: | X. Peng M. Li F. Wang |
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| Affiliation: | State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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| Abstract: | An ultrafine-grained (UFG) Ni3Al was fabricated by annealing an electrodeposited Ni–Al composite in vacuum at 600 °C for 2 h. The UFG Ni3Al, compared to a compositional-similar but coarse-grained (CG) alloy prepared by arc-melting, exhibited a greatly increased cyclic oxidation resistance at 900 °C. Microstructural investigation showed that the CG alloy grew a scale with a high susceptibility to buckling and cracking because of the formation of large voids at the scale/metal interface, but that the UFG alloy grew an adherent scale, because its typical structure prevented the formation of the interface void during oxidation. |
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| Keywords: | A. Alloy A. Intermetallics B. SEM B. TEM B. XRD C. Oxidation |
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