Structural variation and phase transformations of decagonal quasicrystals in the Al-Ni-Co system

Ampo Sai, A. Fujiwara, A. Inoue, T. Masumoto

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

A variation in the structure of the decagonal phase with composition and phase transformations related to the decagonal phase have been observed in Al70Ni30-xCoxalloys with x varying from 16 to 24. A decagonal phase with fundamental reflections at Al70Ni24Co6converts to a (type I) superstructure around Al70Ni18Co12and to another type (II) of superstructure at Al70Ni14Co16An order-disorder transformation in the type-I superstructure of the decagonal quasicrystal has been observed in alloys with x varying from 12 to 15 in the temperature range from 973 to 1073 K. The other transformation from a mixture of a decagonal phase and a cubic Al(Ni, Co) phase to crystalline phases has been identified in the alloys with x varying from 18 to 20 in the temperature range between 1273 and 1073 K. Both transformations are reversible.

Original languageEnglish
Pages (from-to)233-240
Number of pages8
JournalPhilosophical Magazine Letters
Volume74
Issue number4
DOIs
Publication statusPublished - 1996 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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