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Deformation Behavior of ReCr Sigma Phase Diffusion Barrier on Ni-based Superalloy

Published online by Cambridge University Press:  26 February 2011

Seiji Miura ,
Kenji Ohkubo ,
Tetsuo Mohri ,
Takayuki Yoshioka  and
Toshio Narita
Seiji Miura
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan, 81-11-706-6347, 81-11-706-6347
Kenji Ohkubo
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan
Tetsuo Mohri
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan
Takayuki Yoshioka
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan
Toshio Narita
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan
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Abstract

In order to attain a better oxidation resistance of Ni-based superalloys for high performance engines, a ReCr-based sigma-phase diffusion barrier coating between the MCrAlY bond coat (Al reservoir) layer and a Ni-based superalloy substrate has been proposed to suppress the diffusion of Al and other elements. The deformation behavior of TMS82+ superalloy specimens with coating layers composed of an Al-rich surface layer (corresponding to a bond coat) and a ReCr sigma-phase inner layer is investigated. In-situ observation of the bending tests using a Laser scanning confocal microscopy revealed that the crack formation in the Al-rich surface layer(s) on the tension side of the bend specimen occurs at an early stage of bending. On the other hand, small cracks in the sigma-phase layer under the Al-rich surface layer(s) are formed at the slip traces in the Ni-based superalloy single crystal substrate. This suggests a good adhesion between the sigma-phase and the Ni-based superalloy. At the compression side, in both the Al-rich surface layer(s) and the sigma-phase layer no cracking was observed until the Al-rich surface layer(s) shows buckling.

Keywords

barrier layerfractureadhesion
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II08-07
Copyright
Copyright © Materials Research Society 2007

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References

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