Precipitates in a Mg-Zn-Y alloy reinforced by an icosahedral quasicrystalline phase

I. J. Kim, D. H. Bae, D. H. Kim

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74 Citations (Scopus)

Abstract

The precipitation behavior under various heat treatment conditions in the as-cast and hot-rolled Mg-Zn-Y alloy has been investigated. While MgZn2 precipitates are distributed in the α-Mg matrix at 190°C, in the temperature range of 350-420°C, polygon-shaped icosahedral phase (I-phase) precipitates are mainly formed. The precipitated I-phase is mostly found to be localized near the eutectic region in the as-cast ingot, but it is randomly distributed throughout the refined α-Mg grains formed by dynamic recrystallization during the hot-rolling processes in the sheet. The I-phase precipitates have no specific orientation relationship with the α-Mg matrix and do not coarsen at high temperatures. An increase of the hardness value by I-phase precipitates is less significant than that by MgZn2 precipitates due to their relatively low number density and near-spherical morphology.

Original languageEnglish
Pages (from-to)313-318
Number of pages6
JournalMaterials Science and Engineering A
Volume359
Issue number1-2
DOIs
Publication statusPublished - 2003 Oct 25

Bibliographical note

Funding Information:
This work is supported by Creative Research Initiatives of the Korean Ministry of Science and Technology.

All Science Journal Classification (ASJC) codes

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

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