Regulating twin boundary mobility by annealing in magnesium and its alloys

Yujie Cui, Yunping Li, Zhongchang Wang, Qian Lei, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We combine pre-compressive test, reverse tensile test, re-compressive test, in-situ electron back-scattered diffraction, and high-resolution transmission electron microscopy to systematically investigate the effect of annealing on the reciprocal motion of twin boundary (TB) in pure Mg and Mg alloys AZ31 and AZ91. We find that the twin boundary mobility (TBM) can be enhanced by decreasing the dislocation density and increasing the number of coherent TBs after annealing for a short time. On the other hand, after prolonged annealing in Mg alloys, TBM decreases since TBs are stabilized by segregated solute atoms and precipitates. As a result, the TBM significantly depends on both the alloying element content and the annealing time. We demonstrate, for the first time, that friction stress and back stress can be applied to clarify the variation of TBM during annealing in Mg alloys. Our findings show that the TBM can be regulated by annealing, opening up a novel avenue for developing Mg alloys with high damping capacity or enhanced mechanical properties.

Original languageEnglish
Pages (from-to)1-18
Number of pages18
JournalInternational Journal of Plasticity
Volume99
DOIs
Publication statusPublished - 2017 Dec 1

Keywords

  • Detwinning
  • EBSD
  • HRTEM
  • Mechanical testing
  • Microstructure
  • Twinning

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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