Effects of zinc on creep strength and deformation substructures in Mg-Y alloy

Mayumi Suzuki, Tsuyoshi Kimura, Junichi Koike, Kouichi Maruyama

Research output: Contribution to journalArticle

116 Citations (Scopus)

Abstract

Compressive Creep behavior of a hot-rolled Mg-Y binary alloy and Mg-Y-Zn ternary alloys was investigated at 650 K. Creep strength of Mg-Y alloys was significantly improved by the addition of zinc. In Mg-Y-Zn alloys, many "planar faults" were formed on (0 0 0 1) matrix planes at high temperatures even with small addition of 0.02 mol% zinc. The stacking fault energy decreased by the simultaneous addition of yttrium (Y) and zinc and many a-dislocations on basal planes were extended. The separation width of the extended dislocations is stabilized by the segregation of yttrium and zinc and the separation width significantly increases under the interaction of partial dislocations on different basal planes. The excellent creep strength in Mg-Y-Zn was explained by the decrease of the mobility of these widely extended dislocations.

Original languageEnglish
Pages (from-to)706-709
Number of pages4
JournalMaterials Science and Engineering A
Volume387-389
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 2004 Dec 15

Keywords

  • Creep
  • Dislocation substructure
  • Extended dislocation
  • Magnesium-yttrium alloys
  • Planar faults
  • Stacking fault energy

ASJC Scopus subject areas

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

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