Accessible 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

Abstract

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