Defect-solute cooperativity mediated evolution of microstructure and mechanical properties in pre-deformed lean Mg alloys during aging

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-08-27 DOI:10.1016/j.scriptamat.2025.116946

Lu Han , Chao Sun , Shen-Bao Jin , Xiang-Yang Yuan , Yong-Kang Li , Sheng-Jie Han , Hui-Yuan Wang

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Abstract

To elucidate the unresolved dynamic evolution of metastable bake-hardening during prolonged isothermal aging, the time-dependent microstructural evolution in 2 % pre-strained Mg-0.6Al-0.7Ce-0.4Ca-0.4Mn alloy under extended aging conditions was systematically investigated. Dislocation networks act as acceleration diffusion pathways facilitating solute redistribution. Furthermore, the co-segregation of Ca and Al atoms induces heterogeneous nucleation of thermodynamically stable nano-(Mg, Al)₂Ca precipitates during prolonged aging. This unique precipitation mechanism effectively compensates for the conventional weakening of dislocation pinning by solutes observed during thermal exposure. Residual matrix solutes progressively form high-density Guinier-Preston (G.P.) zones, which subsequently transform into nano-Al₂Ca precipitates while maintaining spatial distribution density. This work fundamentally uncovers a previously unrecognized age-hardening paradigm mediated by defect-solute cooperativity, providing critical insights for developing cost-effective Mg alloys with enhanced thermal stability.

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缺陷溶质协同作用介导预变形贫镁合金时效过程中组织和力学性能的演变

为了阐明长时间等温时效过程中亚稳态烘烤硬化的未解动力学演化，系统研究了2%预应变Mg-0.6Al-0.7Ce-0.4Ca-0.4Mn合金在长时间时效条件下随时间变化的显微组织演化。位错网络作为加速扩散途径促进溶质再分配。此外，在长时效过程中，Ca和Al原子的共偏析诱导了热力学稳定的纳米（Mg, Al）₂Ca析出物的非均相成核。这种独特的沉淀机制有效地补偿了在热暴露期间观察到的溶质对位错钉钉的传统削弱。残余基质溶质逐渐形成高密度的Guinier-Preston （gp）带，随后转化为纳米al₂Ca沉淀，同时保持空间分布密度。这项工作从根本上揭示了以前未被认识到的由缺陷溶质协同作用介导的时效硬化范式，为开发具有增强热稳定性的经济高效的镁合金提供了关键见解。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.