Effects of Ir or Ta Alloying Addition on Interdiffusion of L12-Ni3Al

N. Garimella, M. Ode, M. Ikeda, H. Murakami, Y. H. Sohn

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Abstract

Ternary interdiffusion in L12-Ni3Al with ternary alloying additions of Ir and Ta was investigated at 1473 K using solid-to-solid diffusion couples. Average ternary interdiffusion coefficients were determined from an integration of interdiffusion fluxes calculated directly from experimental concentration profiles. The magnitude of over(over(D, ̃), -)NiNi and over(over(D, ̃), -)AlAl coefficients was determined to be much larger than that of over(over(D, ̃), -)IrIr and over(over(D, ̃), -)TaTa coefficients. Ir substituting in Ni-site influenced the interdiffusion of Ni significantly, and over(over(D, ̃), -)NiIrAl coefficients were determined to be large and positive. On the other hand, Ta substituting for Al influenced the interdiffusion of Al significantly, and over(over(D, ̃), -)AlTaNi coefficients were determined to be large and positive. An excellent agreement was found with ternary interdiffusion coefficients determined by Boltzmann-Matano analysis. Profiles of concentrations and interdiffusion fluxes were also examined to estimate binary interdiffusion coefficients in Ni3Al, and tracer diffusion coefficients of Ir (14.7 × 10-16 ± 1.4 × 10-16 m2/s) and Ta (2.6 × 10-16 ± 2.4 × 10-16 m2/s) in Ni3Al.

Original languageEnglish
Pages (from-to)1095-1103
Number of pages9
JournalIntermetallics
Volume16
Issue number9
DOIs
Publication statusPublished - 2008 Sep 1

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Keywords

  • A. Nickel aluminides, based on NiAl
  • B. Diffusion
  • D. Site occupancy
  • F. Electron microprobe

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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