Heterogeneous nucleation-driven precipitation of densely distributed nanoscale phases in a low-alloyed magnesium alloy

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-03-27 DOI:10.1016/j.scriptamat.2025.116667

Zhao-Yuan Meng , X.Y. Xu , Shen-Bao Jin , Yu-Long Zhu , Peng Chen , Hui-Yuan Wang

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Abstract

In this work, we report a heterogeneous nucleation-driven precipitation in a low-alloyed magnesium (Mg) alloy, in which tri-atomic-layer η' phases serve as nucleation sites for Al-Mn-(Ca) precipitates. After peak aging, the alloy exhibits a high density of nanoscale Al-Mn-Ca phases (∼2.5 × 10²³ m⁻³), resulting in a substantial age-hardening response of ∼61 MPa, with no decline observed even after prolonged over-aging for up to 300 h. Atomic-resolution HAADF-STEM and APT analyses reveal a three-stage phase evolution: (I) initial η' phase formation, (II) heterogeneous nucleation of Al-Mn clusters on η' phases, and (III) transformation of Al-Mn clusters into Al-Mn-Ca phases, accompanied by partial η' phase dissolution. Molecular dynamics simulations further identify non-equilibrium stress sites around the tri-atomic-layer Al-Ca η' phases, driving the preferential aggregation of Al-Mn clusters. This work presents a new strategy for precipitate inoculation in solid-state precipitation, offering pathways to enhance precipitate density in Mg alloys.

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低合金镁合金中密集分布的纳米相非均相形核驱动析出

在这项工作中，我们报道了低合金镁（Mg）合金中的非均相形核驱动析出，其中三原子层η相作为Al-Mn-(Ca)析出的形核位点。峰时效后，合金表现出高密度的纳米级Al-Mn-Ca相（~ 2.5 × 1023 m−3），产生了可观的时效硬化响应（~ 61 MPa），即使在延长过时效长达300小时后也没有观察到下降。原子分辨率HAADF-STEM和APT分析揭示了三个阶段的相演变：(1)初始η′相形成；(2)Al-Mn团簇在η′相上非均相形核；(3)Al-Mn团簇转变为Al-Mn- ca相，并伴有部分η′相溶解。分子动力学模拟进一步确定了三原子层Al-Ca η相周围的非平衡应力位点，驱动Al-Mn团簇的优先聚集。本研究提出了一种在固态析出中孕育析出相的新策略，为提高镁合金中析出相密度提供了途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.