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Phase equilibria, diffusion growth and diffusivities in Ni-Al-Pt system using Pt/β-NiAl diffusion couples

W. Gong, L. Zhang, H. Wei, C. Zhou

Progress in Natural Science: Materials International, 21, 221-226, (2011)

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The phase equilibria, diffusion growth and diffusivities in the Ni-Al-Pt system at 1150, 1 200 and 1 250 °C were studied using Pt/β-NiAl diffusion couples. Based on the measured concentration profiles coupled with the local equilibrium hypothesis, the tie-lines between neighboring phases were determined. Two intermediate phases, Pt3Al and α-NiPt(Al), are found to develop between the Pt and β-NiAl couples. The thicknesses of Pt3Al and α-NiPt(Al) layers varies linearly with the square of annealing time, indicating that the growth of Pt3Al and α-NiPt(Al) are diffusion-controlled. The calculated Arrhenius equations of the parabolic growth constants, κ, for the Pt3Al and α-NiPt(Al) phases are obtained, respectively. The average ternary inter-diffusivities of the Pt3Al and β-NiAl phases at different temperatures are determined from an integration of inter-diffusion fluxes calculated directly from the experimental concentration profiles.

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{"type":"article", "name":"w.gong20116", "author":"W. Gong and L. Zhang and H. Wei and C. Zhou", "title":"Phase equilibria, diffusion growth and diffusivities in NiAlPt system using Pt/\betaNiAl diffusion couples", "journal":"Progress in Natural Science: Materials International", "volume":"21", "OPTnumber":"3", "OPTmonth":"6", "year":"2011", "OPTpages":"221-226", "OPTnote":"", "OPTkey":"platinum group; nickel aluminides; phase equilibria; thermodynamic; diffusion", "DOI":""}
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