Yielding behaviour and Hall­–Petch relationship in ultrafine-grained Al–Mg binary alloys

Naoya Kamikawa, Toyohisa Hirooka, Tadashi Furuhara

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigates yielding behaviour, Hall–Petch relationship and strengthening mechanism of ultrafine-grained Al–Mg binary alloys. Ultrafine-grained Al–Mg samples reveal unusual discontinuous yielding and extra Hall–Petch strengthening. The critical grain size to separate the extra Hall–Petch strengthening from the conventional Hall–Petch strengthening becomes larger as the Mg content is higher, indicating that dislocation sources in the ultrafine-grained structure becomes more difficult to activate by solute atoms of Mg. It is also found that the Lüders elongation in the discontinuous yielding becomes less pronounced by Mg addition, suggesting that enhancement of work hardening ability by addition of solute atoms is effective to avoid the occurrence of unwanted discontinuous yielding in ultrafine-grained metals.

Original languageEnglish
Pages (from-to)210-223
Number of pages14
JournalMaterials Science and Technology (United Kingdom)
Volume37
Issue number2
DOIs
Publication statusPublished - 2021
Externally publishedYes

Keywords

  • Al–Mg alloy
  • Hall–Petch relationship
  • Ultrafine grains
  • discontinuous yielding
  • mechanical properties
  • strengthening mechanism

ASJC Scopus subject areas

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

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