Enhanced multiple precipitation and long-term stability in AlCuMgSi(Sc) alloys with Er additions

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-17 DOI:10.1016/j.matchar.2024.114461

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引用次数: 0

Abstract

The precipitate evolution and microstructure stability of AlCuMgSiSc alloys with Er additions were intentionally investigated. It reveals that the Cu-containing metastable precipitates (rod-liked Q′ and lath-liked L precipitates) are promoted and achieved highest tensile strength of ∼441.3 MPa through precipitation strengthening after aging at 12 h in AlCuMgSiErSc alloy. Meanwhile, the AlCuMgSiErSc alloy shows approximately ∼6.9 % and ∼ 10.8 % higher UTS (27.7 MPa) and YS (34.1 MPa) than AlCuMgSiSc alloy after severe over aging for 150 h, respectively. Surprisingly, the σ-Al₅Cu₆Mg₂ precipitates are rarely observed in AlCuMgSiErSc alloy indicating that the formation of σ-Al₅Cu₆Mg₂ is inhibited. The excellent thermal stability can be explained by the high density of Q′ precipitates with hybrid structures and L precipitates. Moreover, Er solute atoms preferentially segregate at the interface of the Q′ precipitates and enrich the θ' precipitate, which inhibits the diffusion of solute atoms and stabilizes the coarsening of precipitates. This work may provide a strategy for designing AlCu series alloys with thermally stable microstructures.

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添加 Er 后 AlCuMgSi（Sc）合金的多重析出和长期稳定性得到增强

有意研究了添加 Er 的 AlCuMgSiSc 合金的析出物演化和微观结构稳定性。结果表明，AlCuMgSiErSc 合金在时效 12 h 后，通过沉淀强化，促进了含铜析出物（棒状嗜Q′和板状嗜L析出物）的生成，并获得了最高的抗拉强度∼441.3 MPa。同时，AlCuMgSiErSc 合金在严重超时效 150 h 后，其 UTS（27.7 MPa）和 YS（34.1 MPa）分别比 AlCuMgSiSc 合金高出约 ∼ 6.9 % 和 ∼ 10.8 %。令人惊讶的是，在 AlCuMgSiErSc 合金中很少观察到 σ-Al5Cu6Mg2 沉淀，这表明 σ-Al5Cu6Mg2 的形成受到了抑制。具有混合结构的 Q′析出物和 L 析出物的高密度可以解释出色的热稳定性。此外，Er 溶质原子优先偏析于 Q′沉淀的界面并富集到 θ' 沉淀中，从而抑制了溶质原子的扩散并稳定了沉淀的粗化。这项研究为设计具有热稳定微观结构的 AlCu 系列合金提供了一种策略。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.