Formation and structure of icosahedral phase in Al-Mg-Li alloys

A. P. Tsai, A. Niikura, A. Yamamoto, A. Inoue, T. Masumoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We present the formation of a face-centered icosahedral(FCI) phase in melt quenched Al-Mg-Li alloys and a stable related crystalline phase in Al50Mg20Li30 alloy. On the basis of the systematic change in intensity of superlattice reflections along composition due to chemical order between Li and Mg atoms, we modify a structure model based on the sructure of icosahedral Mg-Al-Zn alloy for the FCI phase in Al-Mg-Li alloys. It has an ordered arrangement of two icosahedral atom clusters. One consists of 20 Mg and 24 Al and the other contains 20 Li and 24 Al. The corresponding 1/1 crystal approximat has the Al24Mg20 cluster at the origin and the Al24Li20 cluster at the body center and its space group is Pm3.

Original languageEnglish
Pages (from-to)191-197
Number of pages7
JournalScience Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume42
Issue number1
Publication statusPublished - 1996 Mar 1

Keywords

  • Al-Li-Mg
  • Face-centered icosahedral lattice
  • Frank-Kasper type
  • Icosahedral quasicrystal

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys

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