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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

In-situ studies of the TGO growth stresses and the martensitic transformation in the B2 phase in commercial Pt-modified NiAl and NiCoCrAlY bond coat alloys

  • D. Hovis , L. Hu , A. Reddy , A. H. Heuer , A. P. Paulikas and B. W. Veal


Oxide growth stresses were measured in situ at 1100 °C on commercial Pt-modified NiAl and NiCoCrAlY bond coat alloys using synchrotron X-rays. Measurements were taken on samples that had no preoxidation, as well as on samples that had experienced 24 one-hour thermal exposures at 1150 °C, a condition known to induce rumpling in the Pt-modified NiAl alloy, but not in the NiCoCrAlY alloy. The NiCoCrAlY alloy showed continuous stress relaxation under all conditions, whereas the Pt-modified NiAl alloys would typically stabilize at a fixed (often non-zero) stress suggesting a higher creep strength in the “Thermally Grown Oxide” on the latter alloy, though the precise behavior was dependent on initial surface preparation. The formation of martensite in the Pt-modified NiAl alloys was also observed upon cooling and occurred at temperatures below 200 °C for all of the samples observed. Based on existing models, this Ms temperature is too low to account for the rumpling observed in these alloys.

* Correspondence address, Prof. Dr. A. H. Heuer, Case Western Reserve University, Dept. of Materials Science and Engineering, 10900 Euclid Ave. White 418, Cleveland, OH 44106-7204, USA. Tel.: +1 216 368 3868, Fax: +1 216 368 8932, E-mail:


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Received: 2007-7-20
Accepted: 2007-9-3
Published Online: 2013-06-11
Published in Print: 2007-12-01

© 2007, Carl Hanser Verlag, München

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