TEM observations of Al72Ni12Co16 decagonal quasicrystal subjected to high-temperature indentation

K. Saito, Y. Arakaki, S. Sugawara, R. Shindo, J. Q. Guo, A. P. Tsai

Research output: Contribution to journalArticlepeer-review

Abstract

The effect of high-temperature indentation testing on the microstructural change of a single-grained Al72Ni12Co16 decagonal quasicrystal (d-QC) has been investigated by transmission electron diffraction and microscopy (TEM) technique. A definite surface normal to the 10-fold axis of the d-QC was subjected to Vickers indentation test at an elevated temperature of 800 °C with a load of 1 kgf. The TEM investigation of this sample has evidently shown that there are specific types of defects densely distributed in the indented-region, such as grain-boundaries, dislocations and phason-related defects. Furthermore, high-resolution electron microscopy observations have revealed the widespread distribution of nanocrystalline domains in the indented-region, where groups of decagonal atom clusters have a periodic arrangement to form a rhombic lattice. On the basis of these observations, possible deformation mechanisms of the d-QC during high-temperature indentation will be discussed.

Original languageEnglish
Pages (from-to)241-248
Number of pages8
JournalMaterials Science and Engineering A
Volume403
Issue number1-2
DOIs
Publication statusPublished - 2005 Aug 25
Externally publishedYes

Keywords

  • Deformation
  • Quasicrystals
  • TEM
  • Vickers indentation

ASJC Scopus subject areas

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

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