Quaternary diffusion in 7000 aluminum alloys

Tomoshi Takahashi, Kazuko Hirayama, Yoritoshi Minamino, Toshimi Yamane, Yuuichiro Koizumi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Quaternary and ternary interdiffusion experiments of 7000 aluminum alloys have been performed at 725 K and 755 K. The concentration profiles indicate that the diffusion distance of Cu is shorter than those of Zn and Mg in the solid solutions. The direct interdiffusion coefficients DZnZnAl, DMgMgAl are positive, and indirect coefficients DZnMgAl, DMgZnAl are negative in the ternary Al-Zn-Mg alloys. The effective interdiffusion coefficients in 7000 aluminum alloys are in the order DZn,Ceff>DMg,Ceff>DCu,Ceff. When the concentration distribution of Zn and Mg are almost constant and the concentration of Cu approaches zero in the Al-Zn-Mg/Al-Zn-Mg-Cu couple, it is obvious that DCu,Ceff = DCuCu4 = D*Cu(Al-Zn-Mg). The ratio values of indirect to direct diffusion coefficients suggest that attractive interactions of Zn-Mg and Cu-Mg exist in the Al-Zn-Mg-Cu alloys.

Original languageEnglish
Pages (from-to)499-504
Number of pages6
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume50
Issue number10
DOIs
Publication statusPublished - 2000 Oct

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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