Effect of heat-treatment on microstructure and strength of quasicrystal-containing extruded Mg-Zn-Y alloys

Alok Singh, M. Watanabe, A. Kato, Ampo Sai

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Quasicrystal-containing dilute Mg-Zn-Y alloys exhibit high ductility with moderate strength and a stable microstructure at elevated temperatures. We report here the effect of heat treatment on two extruded alloys Mg 95Z4.2Y0.8 and Mg92.5Zn 6.5Y. The quasicrystal particles, facetted and showing a definite orientation relationship with the matrix, become rounded on heating to 400°C. In the matrix, fine rods of MgZn2 precursor phase occur parallel to the hexagonal axis. A ternary phase, τ1, related to Mg4Zn7, precipitates in the matrix upon annealing of alloy Mg95Zn4.2Y0.8, and is be replaced by precipitates of quasicrystal phase on further annealing. In the alloy Mg 92.5Zn6.5Y, the quasicrystal phase transforms to a hexagonal Mg25Zn58Y17 phase at 400°C. The quasicrystal then reprecipitates on its interface, forming a nano-composite. Effects of microstructural changes on the deformation behavior are described.

Original languageEnglish
Pages (from-to)105-110
Number of pages6
JournalMagnesium Technology
Publication statusPublished - 2005 Sep 27
Event2005 TMS Annual Meeting - San Francisco, CA, United States
Duration: 2005 Feb 132005 Feb 17

Keywords

  • Heat treatment
  • Magnesium alloys
  • Microstructure
  • Quasicrystal

ASJC Scopus subject areas

  • Engineering(all)

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