Influence of Re on the properties of a NiCoCrAlY coating alloy

Liang, J. J., Wei, H., Zhu, Y. L., Sun, X. F., Hu, Z. Q., Dargusch, M. S. and Yao, X. D. (2011) Influence of Re on the properties of a NiCoCrAlY coating alloy. Journal of Materials Science and Technology, 27 5: 408-414. doi:10.1016/S1005-0302(11)60083-2


Author Liang, J. J.
Wei, H.
Zhu, Y. L.
Sun, X. F.
Hu, Z. Q.
Dargusch, M. S.
Yao, X. D.
Title Influence of Re on the properties of a NiCoCrAlY coating alloy
Journal name Journal of Materials Science and Technology   Check publisher's open access policy
ISSN 1005-0302
Publication date 2011
Sub-type Article (original research)
DOI 10.1016/S1005-0302(11)60083-2
Volume 27
Issue 5
Start page 408
End page 414
Total pages 7
Place of publication Shenyang, Liaoning, China
Abstract MCrAlY can serve as stand-alone overlay coatings or bond coats in thermal barrier coating systems, and its properties play a vital role in determining the performance of these coating systems. In order to further understand the behavior of MCrAlY coatings, several NiCoCrAlY model alloys with different levels of Re (0.3 wt%, 6 wt%, and 9 wt%) were investigated. Microstructural observation showed the addition of Re promoted the precipitation of Cr-rich phases, such as α-Cr and σ. The presence of α-Cr lowered the coefficient of thermal expansion (CTE) of the coating alloys, which could reduce the CTE mismatch at the scale-metal interface. The solid solution strengthening effect of Re is responsible for an increase in Rockwell hardness of the coating alloys. But the isothermal oxidation resistance at 1100°C was deteriorated due to the precipitation of brittle α-Cr phase, a phase of inferior oxidation resistance compared with β-NiAI and γ-Ni.
Keyword Hardness
NiCoCrAlY
Oxidation
Phase constitution
Thermal expansion behavior
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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