Twinning behavior of pure magnesium quantitatively investigated by acoustic emission

Yunping Li, Manabu Enoki

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

We used acoustic emission to quantitatively investigate the effects of grain size and strain rate on the twinning behavior of pure magnesium during compression. In a sample with a grain size of 35μm and a strain rate of 1.67×10 -4s -1, the true strain dependence of the twinning size distribution showed that twins form within a grain below a strain of approximately 0.5% and propagate to adjacent grains at higher strain levels. The twinning strain e{open} tw, which is the strain associated with the twin formation, was calculated by considering the variation in the Schmidt factor during the deformation process. An exponential relation was determined between e{open} tw and the cumulative AE counts (N) for samples with different grain sizes and strain rates at the initial stage of the compression process.

Original languageEnglish
Pages (from-to)8-13
Number of pages6
JournalMaterials Science and Engineering A
Volume536
DOIs
Publication statusPublished - 2012 Feb 28

Keywords

  • Acoustic emission
  • Cumulative AE counts
  • Pure magnesium
  • Twinning
  • Twinning strain

ASJC Scopus subject areas

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

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