High strength and high ductility achieved in a heterogeneous lamella-structured magnesium alloy. Issue 3 (4th March 2023)

• Record Type: Journal Article
• Authors: Wang, Tong; Zha, Min; Du, Chunfeng; Jia, Hai-Long; Wang, Cheng; Guan, Kai; Gao, Yipeng; Wang, Hui-Yuan
• Is Part Of: Materials research letters. Volume 11:Issue 3(2023)
• Page Start: 187
• Page End: 195
• Publication Date: 2023-03-04
• Subjects: Mg-alloy -- heterogeneous lamella-structure -- strength-ductility synergy -- deformation behavior; 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: 10.1080/21663831.2022.2133976
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: By introducing heterogeneous lamella-structure, we obtained a superior strength-ductility synergy in Mg-alloy associated with excellent strain-hardening ability, i.e. yield strength of ∼251 MPa, tensile strength of ∼393 MPa and elongation of ∼23%. By using advanced characterization techniques, we showed that strengthening was mainly caused by the non-uniform distribution of hetero-deformation induced (HDI) stress associated with grain-boundary disclinations, which are mediated by heterogeneous multi-grain interactions. Induced by grain-boundary disclinations and intergranular slip transfers, a variety of abnormal deformation modes have been activated，which contributed significantly to enhanced ductility. This work suggests a new avenue to evade strength-ductility trade-off dilemma in Mg-alloys. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: The heterogeneous lamella-structure leads to sustained strain-hardenability in Mg-alloy with unique accommodating deformation modes (extensive abnormal slips and feather-shaped twins), induced by grain-boundary disclinations and intergranular slip transfers.