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January 1, 2021Materials Science and Technology

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

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Authors

NKNaoya KamikawaTHToyohisa HirookaTFTadashi Furuhara

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Overview

Experimental analysis reveals extra Hall–Petch strengthening in ultrafine-grained aluminum–magnesium alloys, indicating solute magnesium suppresses unwanted discontinuous yielding.

Key Points

  • To investigate yielding behavior, the Hall–Petch relationship, and underlying strengthening mechanisms in ultrafine-grained aluminum–magnesium binary alloys.
  • Evaluated mechanical deformation, yielding characteristics, and strengthening response in ultrafine-grained aluminum–magnesium binary alloys across varying magnesium concentrations.
  • Measured grain-size-dependent yield transitions and Lüders elongation relative to solute magnesium content.
  • Ultrafine-grained aluminum–magnesium alloys exhibit unusual discontinuous yielding and an extra Hall–Petch strengthening response.
  • Higher magnesium concentrations increase the critical grain size separating conventional from extra Hall–Petch strengthening by hindering dislocation source activation.
  • Magnesium addition suppresses Lüders elongation by enhancing work hardening capacity, preventing unwanted discontinuous yielding in ultrafine-grained microstructures.

Cite This Study

Kamikawa et al. (2021) studied this question.

synapsesocial.com/papers/6aaf8012d85a37aba6110eb4https://doi.org/10.1080/02670836.2021.1885096
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