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Short-term high temperature oxidation behavior of Pt-modified Ni3Al-based alloys
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School of Materials Science and Engineering,Shanghai University

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TG172.82

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    Abstract:

    The Ni-xPt-25Al (x = 0, 10, 20 and 30 at.%) alloys were fabricated by cold crucible levitation melting under argon atmosphere on a water-cooled Cu crucible. The effects of Pt contents on crystal structures, oxidation kinetics, morphologies of oxides, and oxidation resistance of the Ni-xPt-25Al alloys were studied using X-ray diffraction, simultaneous thermal analyzer, scanning electron microscopy, and X-ray photoelectron spectroscopy. The experimental results showed that Pt-modified Ni3Al-based alloys still kept γ′ phases with Pt contents increasing. The heating up and isothermal periods yield to the linear and parabolic kinetic laws, respectively. Pt plays a beneficial role in promoting the formation of oxides, meanwhile, the increased addition of Pt also improved the integrality and compactness of the oxide films.

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[Zhang Zhixi, Cao Yiran, Cao Guanghui. Short-term high temperature oxidation behavior of Pt-modified Ni3Al-based alloys[J]. Rare Metal Materials and Engineering,2021,50(4):1270~1282.]
DOI:10.12442/j. issn.1002-185X.20200105

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History
  • Received:February 20,2020
  • Revised:April 27,2020
  • Adopted:May 08,2020
  • Online: May 08,2021
  • Published: