材料科学技术（英）,
2011, 27(5): 408-414.
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1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;Graduate School of Chinese Academy of Sciences, Beijing 100039, China
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Materials & Mining Engineering, The University of Queensland, QLD 4072, Australia
3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
5.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
6.School of Materials & Mining Engineering, The University of Queensland, QLD 4072, Australia
7.School of Materials & Mining Engineering, The University of Queensland, QLD 4072, Australia
基金项目:
the National Natural Science Foundation of China(NSFC)under(U1037601;50671 102)
the opening fund of State Key Laboratory of Nonlinear Mechanics(LNM),Institute of Mechanics,Chinese Academy of Sciences
This work Was financially supported by the National Basic Research Program("973 Program")of China(2010CB631200(2010CB631206)
Influence of Re on the Properties of a NiCoCrAlY Coating Alloy
J.J. Liang
1,
, H. Wei
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, Y.L. Zhu
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, X.F. Sun
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, Z.Q. Hu
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, M.S. Dargusch
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, X.D. Yao
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1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;Graduate School of Chinese Academy of Sciences, Beijing 100039, China
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Materials & Mining Engineering, The University of Queensland, QLD 4072, Australia
3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
5.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
6.School of Materials & Mining Engineering, The University of Queensland, QLD 4072, Australia
7.School of Materials & Mining Engineering, The University of Queensland, QLD 4072, Australia
Keywords：
NiCoCrAlY
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℃ was deteriorated due to the precipitation of brittle α-Cr phase, a phase of inferior oxidation resistance compared withβ-NiAl and Υ-Ni.
参考文献
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