Direct observation of growth and stability of Al-Cu-Fe quasicrystal thin films

Hadi Parsamehr, Chun Liang Yang, Wei Ting Liu, Shi Wei Chen, Shou Yi Chang, Lih Juann Chen, An Pang Tsai, Chih Huang Lai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Al-Cu-Fe based quasicrystal thin films exhibit unique surface and mechanical properties. To better understand the formation of the quasicrystal thin films, we observe direct growth of quasicrystals, prepared in a multilayer Al-Cu-Fe thin films with subsequent heat treatment, by in-situ synchrotron x-ray diffraction and in-situ transmission electron microscopy during heating and cooling. Using these two methods, we show that the ternary phase is more thermodynamically stable compared to the binary phases at temperature higher than 470 °C during the heating process, and quasicrystal formation occurs during the cooling process, specifically at 660 °C, after the sample has reached a liquid state. To distinguish quasicrystal from approximant crystals in the obtained thin film samples, we use high resolution x-ray diffraction to analyze the sample at room temperature. We reveal that the peak broadening increases monotonically along the twofold, threefold, and fivefold high-symmetry directions with the physical scattering vector but does not have systematic dependence on the phason momentum, which suggests that the thin film sample is indeed a quasicrystal instead of approximant crystals and it is almost free of phason strain. Our study provides a complete understanding of the growth mechanism for thin film Al-Cu-Fe quasicrystals, which is of particular importance for developing versatile applications of quasicrystal thin films.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalActa Materialia
Volume174
DOIs
Publication statusPublished - 2019 Aug 1

Keywords

  • Growth mechanism
  • Heating and cooling
  • In-situ TEM
  • In-situ XRD
  • Phason strain
  • Quasicrystal formation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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