Mechanical properties and deformation behaviour of large Al70Pd20Mn10 single quasi-crystals

Akihisa Inoue, Yoshihiko Yokoyama, Tsuyoshi Masumoto

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

An icosahedral single quasi-crystal of Al70Pd20Mn10 was found to be deformed in the temperature range above 1000 K, accompanying the generation of a number of deformation markings. The deformation appears to occur inhomogeneously along the deformation bands which lie on the fivefold plane and the region in the deformation bands is identified to have deviated alloy compositions and approximant crystalline structures. As the test temperature increases, the density of the deformation markings increases accompanying the decrease in their spacing. Superplasticity is also obtained at temperatures above 0.98Tm, presumably because of the sliding at the interface between icosahedral and approximant crystalline phases. Furthermore, a number of dislocations are observed in the icosahedral phase deformed at temperatures above 1000 K and the dislocation density is much higher near the interface. The Burgers vector was analysed to have the twofold direction for the dislocations on the fivefold plane. It is therefore concluded that the icosahedral single quasi-crystal can be deformed via dislocations along the interface between icosahedral and approximant crystalline phases at temperatures above 1000 K.

Original languageEnglish
Pages (from-to)850-855
Number of pages6
JournalMaterials Science and Engineering A
Volume181-182
Issue numberC
DOIs
Publication statusPublished - 1994 May 15

ASJC Scopus subject areas

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

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