Measurement of intrinsic diffusion coefficients of Al and Ni in Ni3Al using Ni/NiAl diffusion couples

Kozo Fujiwara, Zenji Horita

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

The diffusion behavior of Al and Ni in Ni3Al with the L12-type crystal structure is examined by measuring intrinsic diffusion coefficients. First, interdiffusion coefficients are determined using Ni/NiAl diffusion couples forming a Ni3Al phase at the interface. The intrinsic diffusion coefficients are then determined from the interdiffusion coefficients and velocities of the Kirkendall interface with respect to the Matano plane through the Darken equation. It is shown that the intrinsic diffusion coefficients of Al and Ni in Ni3Al are of almost equal magnitude in the investigated temperature range (1423-1523 K). This conclusion is evaluated within the experimental error involved in the determination of the Matano plane. The self-diffusion coefficient of Al in Ni3Al is derived from the intrinsic diffusion coefficients of Al and Ni in Ni3Al and is compared with the estimation reported in the literature. It is shown that the present results support the diffusion mechanisms considering anti-site defects.

Original languageEnglish
Pages (from-to)1571-1579
Number of pages9
JournalActa Materialia
Volume50
Issue number6
DOIs
Publication statusPublished - Apr 2 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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