Strengthening mechanisms induced by sequential grain refinement and solid solution strengthening in dual-phase heterostructured Mg-Li alloys with low Al content

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-03-04 DOI:10.1016/j.jallcom.2025.179527

Mengning Xu , Lirong Xiao , Bo Gao , Zhenghao Li , Zixiang Wu , Xuefei Chen , Hao Zhou , Yuntian Zhu

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Abstract

Achieving a high strength-ductility synergy in magnesium alloys is challenging due to their low deformability. In this study, a dual-phase heterostructured Mg-Li alloy was fabricated via cold rolling, exhibiting an excellent specific strength (∼184.8 kNm·kg⁻¹) and elongation (∼16.5%). The addition of Al induced contrasting lattice distortion behaviors in the α- and β-phases, enhancing solid solution strengthening, strain hardening, and hetero-deformation induced (HDI) strengthening. Compared to Mg-9Li, the Mg-9Li-1Al alloy exhibited a higher dislocation density, improved grain refinement efficiency, and increased phase boundary density, leading to stronger HDI stress and improved mechanical properties. These findings provide insights into the strengthening mechanisms of dual-phase heterostructured Mg-Li alloys and offer guidance for designing high-performance magnesium alloys.

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低Al双相异质组织Mg-Li合金的顺序晶粒细化和固溶强化机制

由于镁合金的低变形性，实现高强度-延展性协同是具有挑战性的。本文通过冷轧法制备了双相异质组织Mg-Li合金，该合金具有优异的比强度（~184.8 kNm·kg-1）和延伸率（~16.5%）。Al的加入诱导了α-和β-相的晶格畸变行为，增强了固溶强化、应变硬化和异质变形诱导（HDI）强化。与Mg-9Li相比，Mg-9Li- 1al合金的位错密度更高，晶粒细化效率提高，相界密度增加，导致HDI应力增强，力学性能得到改善。这些发现为进一步了解双相异质结构Mg-Li合金的强化机理提供了新的思路，并为高性能镁合金的设计提供了指导。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.