Microstructure and growth morphology of Frank-Kasper phase in rapidly solidified Mg32Al17Zn32 ternary alloys

Man Zhu, Gencang Yang, Diqing Wan, Zhijun Wang, Yaohe Zhou

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Abstract

In the present investigation, the microstructures and growth morphology of Mg32(Al,Zn)49 Frank-Kasper phase in rapidly solidified Mg32Al17Zn32 ternary alloys were studied in detail. The samples were characterised by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), field-emission scanning electron microscopy (FE-SEM) and energy dispersive spectrum (EDS). The results show that the microstructures mainly consist of Mg32(Al,Zn)49 Frank-Kasper phase and interdendritic Mg-rich Φ-phase. Under rapid solidification condition, Mg32(Al,Zn)49 Frank-Kasper phase reveals a perfect faceted dendritic characteristic in the shape of a three-fold symmetric microstructure with doublet tips in the axes direction. Observations for fracture surfaces show that the growth morphology of Mg32(Al,Zn) 49 grains was truncated cubic, and its growth mechanism was also discussed.

Original languageEnglish
Pages (from-to)401-404
Number of pages4
JournalRare Metals
Volume28
Issue number4
DOIs
StatePublished - Aug 2009

Keywords

  • Faceted dendrite
  • Frank-Kasper phase
  • Growth morphology
  • Rapid solidification

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