Influence of precipitation on yield elongation in Mg-Zn alloys

Jun Wang, Mahmoud Reza Ghandehari Ferdowsi, Sitarama R. Kada, Christopher R. Hutchinson, Matthew R. Barnett

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)

Abstract

The effect of precipitation on yield elongation in an extruded Mg-4.5 wt% Zn alloy is investigated. The yield plateau is shown to disappear in the presence of precipitation and it is subsequently proposed that two criteria need to be satisfied for a distinct yield plateau: (1) the initial propagation of twins is autocatalytic in that twinning in one grain should stimulate twinning in an adjacent grain; (2) the twins that initially form should display an appreciable aspect ratio. These two criteria can also explain why the yield elongation decreases with an increase in grain size and deformation temperature.

Original languageEnglish
Pages (from-to)5-8
Number of pages4
JournalScripta Materialia
Volume160
DOIs
Publication statusPublished - 1 Feb 2019

Keywords

  • Magnesium alloys
  • Precipitation
  • Twinning
  • Yield elongation

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