Very long term oxidation of Ti-48Al-2Cr-2Nb at 704 deg C in air

Very long term oxidation of Ti-48Al-2Cr-2Nb at 704 deg C in air

For Ti-48Al-2Cr-Nb exposed from 1000-9000 h at 704 deg C in air, a complex, mixed alumina/titania scale, rather than a protective alumina scale, is formed. After 9000 h, this scale was approx15 mu m thick. A continuous Ti-rich nitride layer was present at the alloy-scale interface. The alloy ahead o...

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Veröffentlicht in:Scripta materialia 1997-09, Vol.37 (6), p.761-766
Hauptverfasser: Locci, I E, Brady, M P, MacKay, R A, Smith, J W
Format: Artikel
Sprache:eng
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Zusammenfassung:For Ti-48Al-2Cr-Nb exposed from 1000-9000 h at 704 deg C in air, a complex, mixed alumina/titania scale, rather than a protective alumina scale, is formed. After 9000 h, this scale was approx15 mu m thick. A continuous Ti-rich nitride layer was present at the alloy-scale interface. The alloy ahead of the nitride layer was depleted in Ti and enriched in Al. This nitride formation, and associated Al enrichment, appears to be related to a minimum level of Nb in the alloy.
ISSN:1359-6462