Paper Title:
Site Preference and Diffusion in Ni3Al Alloyed with Ir, Ta or Re at 1200°C
  Abstract

Diffusion in L12-Ni3Al with ternary alloying additions of Ir, Ta and Re was investigated at 1200°C using solid-to-solid diffusion couples, and examined with respect to site preference in ordered intermetallic compound. In addition to determination of average ternary interdiffusion coefficients [1-3], average effective interdiffusion coefficients were determined directly from the experimental concentration profiles. Ni has the largest magnitude of average effective interdiffusion coefficient, followed by Al, Ir, Re and Ta. The average effective interdiffusion coefficients for Ir, Re and Ta are much smaller than those for Ni and Al. Tracer diffusion coefficients determined by extrapolation technique, and available literature also followed the same trend. The relative tendency of Ni, Al, Ir, Re and Ta to occupy the -Ni and -Al sites are correlated to these diffusion coefficients, with due consideration for diffusion mechanisms and coordination of atoms.

  Info
Periodical
Defect and Diffusion Forum (Volumes 297-301)
Edited by
Andreas Öchsner, Graeme E. Murch, Ali Shokuhfar and João M.P.Q. Delgado
Pages
1322-1327
DOI
10.4028/www.scientific.net/DDF.297-301.1322
Citation
N. Garimella, H.J. Choi, Y. H. Sohn, "Site Preference and Diffusion in Ni3Al Alloyed with Ir, Ta or Re at 1200°C", Defect and Diffusion Forum, Vols. 297-301, pp. 1322-1327, 2010
Online since
April 2010
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$32.00
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