Anelastic recovery of pure magnesium quantitatively evaluated by acoustic emission

Yunping Li, Manabu Enoki

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Anelastic recovery of pure magnesium was monitored quantitatively by means of acoustic emission (AE) in cyclic compression-quick unloading-recovery process. The influences of grain size, strain rate, and the strain-controlled cyclic process on anelastic recovery were analyzed in details. A detwinning model in anelastic recovery process was proposed, and the results showed good agreement with the experimental data. Three stages of anelastic recovery behavior as a function of strain were observed: stages I and III were considered to be dominated by various detwinning processes and stage II was dominated by thermal motion of dislocation. A quantitative relationship between anelastic recovery strain and AE signals was obtained, and from which the anelastic recovery strains from dislocation motion and detwinning were separated for the first time. In the strain-controlled cyclic process, both the amount of AE signals and the anelastic recovery strain were observed to decrease while the fraction of anelastic recovery strain from dislocation motions was observed to decrease more rapidly than that from detwinning with increasing cyclic number.

Original languageEnglish
Pages (from-to)3098-3106
Number of pages9
JournalJournal of Materials Research
Volume26
Issue number24
DOIs
Publication statusPublished - 2011 Nov 24

Keywords

  • Acoustic emission
  • Mg

ASJC Scopus subject areas

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

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