Rapid dislocation-mediated solute repartitioning towards strain-aging hardening in a fine-grained dilute magnesium alloy. Issue 1 (2nd January 2022)

• Record Type: Journal Article
• Authors: Hua, Zhen-Ming; Zha, Min; Meng, Zhao-Yuan; Jin, Shen-Bao; Sha, Gang; Wang, Tian-Shuai; Wang, Cheng; Jia, Hai-Long; Gao, Yipeng; Wang, Hui-Yuan
• Is Part Of: Materials research letters. Volume 10:Issue 1(2022)
• Page Start: 21
• Page End: 28
• Publication Date: 2022-01-02
• Subjects: Magnesium alloys -- aging -- dislocation -- solute segregation -- strength; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2021.2009585
• Languages: English
• ISSNs: 2166-3831

Abstract

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. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: By manipulating solute distribution while keeping a fine-grain structure, appreciable strain-aging hardening response coupling with fine-grain strengthening guarantees the development of strong dilute Mg alloy.