Icosahedral quasicrystal phase in Al15Mg50Zn35 ternary alloy by rapid quenching

Man Zhu, Gencang Yang, Feng Liu, Diqing Wan, Suling Cheng, Yaohe Zhou

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Almost an icosahedral quasicrstyal phase is obtained in the Mg-riched region off the Bergman line by means of rapid quenching in a cool copper mould. The microstructures, chemical composition and atom cluster of the icosahedral phase are charactered by X-ray diffraction (XRD), scanning electron microscopy (SEM), field-emission scanning electron microscopy and transmission electron microscopy (TEM). It is found that the icosahedral quasicrystal phase is obtained with the composition of 39.76 at% Mg, 18.34 at% Al, and 41.90 at% Zn, which nucleates and grows directly from the melt with icosahedral symmetries. It exhibits a characteristic faceted dendritic growth with the fastest growth direction along a three-fold axes. At the same time, the regular hexagonal-polygon icosahedral quasicrystal grains with a size of 0.2 μ m can also be observed. The atomic cluster of icosahedral phase is pentagonal dodecahedron with icosahedral symmetries and micro-lobes on the each faceted pentagonal face.

Original languageEnglish
Pages (from-to)1179-1182
Number of pages4
JournalXiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume37
Issue number7
StatePublished - Jul 2008

Keywords

  • AlMgZn alloy
  • Atom cluster structure
  • Facetted dendrite
  • Icosahedral quasicrystals
  • Rapid quenching

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