On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys

C. Kale, M. Rajagopalan, S. Turnage, B. Hornbuckle, K. Darling, S. N. Mathaudhu, Kiran Solanki

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The presence of complex states-of-stress and strain-rates directly influence the dominant deformation mechanisms operating in a given material under load. Mg alloys have shown limited ambient temperature formability due to the paucity of active slip-mechanisms, however, studies have focused on quasi-static strain-rates and/or simple loading conditions (primarily uniaxial or biaxial). For the first time, the influence of strain-rate and stress-triaxiality is utilized to unravel the active deformation mechanisms operating along the rolling, transverse- and normal-directions in wrought AZ31-alloy. It is discovered that the activation of various twin-mechanisms in the presence of multiaxial loading is governed by the energetics of the applied strain-rates. [Image Presented] IMPACT STATEMENT It is shown for the first time that the higher deformation energy associated with dynamic strain-rates, coupled with high-triaxiality, promotes detwinning and texture evolution in HCP alloys with high c/a ratio.

Original languageEnglish (US)
Pages (from-to)152-158
Number of pages7
JournalMaterials Research Letters
Volume6
Issue number2
DOIs
StatePublished - Feb 1 2018

Keywords

  • Detwinning
  • Magnesium
  • Stress-triaxiality
  • Twin–twin interaction

ASJC Scopus subject areas

  • Materials Science(all)

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