Simulation of reaction-diffusion phenomena occurring between Ir coating and Ni-Al alloy substrate using phase-field model

Machiko Ode, Taichi Abe, Hideyuki Murakami, Yoko Yamabe-Mitarai, Hidehiro Onodera

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It is very important to understand the development of the microstructure in the interdiffusion zone between coatings and superalloy substrates for designing bond coat materials. In this study, the reaction-diffusion phenomena in the Ir-coating/Ni -Al binary substrate system are simulated using the phase-field model. The thermodynamic database developed based on the CALPHAD method is directly incorporated in the simulation. The effect of coating thickness on the growth of the secondary precipitated β-phase is discussed. In the case of a semi-infinite system, the thickness of the β-phase increases proportionally with the square root of time. In the case of a thin (1 μm thick) coating, inconstant β-phase growth is observed. It is suggested that the phase growth is related to the change in the β-phase fraction, which is derived from a thermodynamic line calculation from the substrate composition to pure Ir.

Original languageEnglish
Pages (from-to)523-526
Number of pages4
JournalInternational Journal of Materials Research
Issue number4
Publication statusPublished - 2010 May 28
Externally publishedYes



  • Al -Ir -Ni ternary alloy
  • Bond coat material
  • Phase-field model
  • Superalloy

ASJC Scopus subject areas

  • Metals and Alloys
  • Materials Chemistry
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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