Rapid dislocation-mediated solute repartitioning towards strain-aging hardening in a fine-grained dilute magnesium alloy

Zhen Ming Hua, Min Zha, Zhao Yuan Meng, Shen Bao Jin, Gang Sha, Tian Shuai Wang, Cheng Wang, Hai Long Jia, Yipeng Gao, Hui Yuan Wang

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Achieving appreciable strain-aging hardening coupling with fine-grain strengthening remains a critical challenge in dilute Mg alloys, as high-temperature solid-solution, utilized to impart high-level solutes for strain-aging, inevitably causes grain coarsening and great strength loss. Herein, we report a rapid dislocation-mediated solute repartitioning behavior upon aging in a low-temperature annealed Mg–1.0Zn–0.45Ca–0.33Sn–0.2Mn (wt.%) alloy. Thereby, appreciable strain-aging hardening (YS increment of ∼30 MPa) coupling with fine-grain (grain size of ∼2.5 µm) strengthening accounts for a high yield strength (∼297 MPa) and ductility (∼20%). It suggests a feasible avenue to develop strong dilute Mg alloys by combining strain-aging hardening and fine-grain strengthening.

Original languageEnglish
Pages (from-to)21-28
Number of pages8
JournalMaterials Research Letters
Volume10
Issue number1
DOIs
StatePublished - 2022
Externally publishedYes

Keywords

  • aging
  • dislocation
  • Magnesium alloys
  • solute segregation
  • strength

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