Diffusion in quasicrystalline Al-Ni-Co and Al-Pd-Mn

Th Zumkley, J. Q. Guo, Ampo Sai, H. Nakajima

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Diffusion coefficients of 60Co in single decagonal (d-)Al72.2Ni11.8Co16.0 quasicrystals and of 63Ni in single icosahedral (i-)Al70Pd21Mn9 were measured by the radioactive tracer method. The volume diffusion coefficients can be described by an Arrhenius equation. Anisotropic diffusion behaviour was observed in the d-Al-Ni-Co quasicrystals, in which the mobility of Co is slightly faster along the periodic direction. The activation enthalpies for Co diffusion in d-Al-Ni-Co are Q = 277.4 kJ mol-1 (periodic direction), Q = 289.0 kJ mol-1 (aperiodic direction) and for Ni diffusion in i-Al-Pd-Mn Q = 209.0 kJ mol-1. The results are discussed together with data of similar diffusion investigations in icosahedral quasicrystals, and a diffusion mechanism via vacancies is suggested. In addition, we have determined surface self-diffusion coefficients of 60Co in the d-Al-Ni-Co quasicrystalline alloy and have obtained different activation energies of surface diffusion for the periodic (Q = 147 kJ mol-1) and the quasiperiodic direction (Q = 137 kJ mol-1).

Original languageEnglish
Pages (from-to)702-705
Number of pages4
JournalMaterials Science and Engineering A
Volume294-296
DOIs
Publication statusPublished - 2000 Dec 15
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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