TY - JOUR
T1 - A comparative study of cyclic oxidized Ir aluminide and aluminized nickel base single crystal superalloy
AU - Kuppusami, P.
AU - Murakami, H.
N1 - Funding Information:
The authors thank Mr K. Nishida for the EPMA analysis. They also gratefully acknowledge Dr H. Harada, Dr F. Wu, Mr T. Yokokawa and Ms A. Suzuki for their technical support during the investigation. One of the authors (P.K.) thanks the Japan Society for Promotion of Science for the financial support.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/9/1
Y1 - 2004/9/1
N2 - A comparative study on microstructure, composition variation and phase distribution in an Ir-aluminide and an aluminized Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation test at 1373 K is reported. The weight change as a function of number of oxidation cycles has demonstrated an improved oxidation resistance for iridium aluminide. While aluminized TMS-75 has an enrichment of aluminium to approximately 50 at.%, an addition of iridium increases the average aluminium concentration of the surface to approximately 70 at.% in the as aluminized condition. Unlike the aluminized TMS-75, the cyclic oxidized Ir aluminide reveals a precipitate free surface layer, followed by a significantly reduced precipitation of γ′-Ni3Al and TCP phases in the diffusion zone.
AB - A comparative study on microstructure, composition variation and phase distribution in an Ir-aluminide and an aluminized Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation test at 1373 K is reported. The weight change as a function of number of oxidation cycles has demonstrated an improved oxidation resistance for iridium aluminide. While aluminized TMS-75 has an enrichment of aluminium to approximately 50 at.%, an addition of iridium increases the average aluminium concentration of the surface to approximately 70 at.% in the as aluminized condition. Unlike the aluminized TMS-75, the cyclic oxidized Ir aluminide reveals a precipitate free surface layer, followed by a significantly reduced precipitation of γ′-Ni3Al and TCP phases in the diffusion zone.
KW - Diffusion
KW - Iridium
KW - Ni-base superalloy
KW - Oxidation
KW - Sputtering
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U2 - 10.1016/j.surfcoat.2003.12.016
DO - 10.1016/j.surfcoat.2003.12.016
M3 - Article
AN - SCOPUS:3543117309
VL - 186
SP - 377
EP - 388
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
SN - 0257-8972
IS - 3
ER -