کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1548420 | 997738 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Phase equilibria, diffusion growth and diffusivities in Ni-Al-Pt system using Pt/β-NiAl diffusion couples Phase equilibria, diffusion growth and diffusivities in Ni-Al-Pt system using Pt/β-NiAl diffusion couples](/preview/png/1548420.png)
The phase equilibria, diffusion growth and diffusivities in the Ni-Al-Pt system at 1 150, 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, k, for the Pt3Al and β-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.
Journal: Progress in Natural Science: Materials International - Volume 21, Issue 3, June 2011, Pages 221–226