Deformation behavior of ReCr sigma phase diffusion barrier on Ni-based superalloy

Seiji Miura, Kenji Ohkubo, Tetsuo Mohri, Takayuki Yoshioka, Toshio Narita

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


In order to attain a better oxidation resistance of Ni-based superalloys for high performance engines, a ReCr-based σ-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 σ-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 σ-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 σphase and the Ni-based superalloy. At the compression side, in both the Al-rich surface layer(s) and the σ-phase layer no cracking was observed until the Al-rich surface layer(s) shows buckling.

Original languageEnglish
Pages (from-to)487-492
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Publication statusPublished - 2007 Jun 29
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 2006 Nov 272006 Nov 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials


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