Effects of L12 precipitates containing Zr, Er, and Y on the precipitation of Al–Zn–Mg alloys at elevated temperatures

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

Materials Characterization Pub Date : 2024-09-14 DOI:10.1016/j.matchar.2024.114374

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Abstract

Microalloying significantly enhances the high-temperature properties of nano-precipitates through solute partitioning at elevated temperatures. In this study, we investigated the effects of L1₂ crystal structural precipitates containing Zr, Er, and Y influence the precipitation of Al–Zn–Mg alloys using transmission electron microscopy and atom-probe tomography. The results demonstrate that the multi-addition of Zr, Er, and Y improves both ambient and high-temperature hardness of Al–Zn–Mg alloys by increasing the number density of precipitates and preventing coarsening of L1₂/η-MgZn₂ type nano-precipitates during over-aging period at elevated temperatures. Particularly, Y forms a thermally stable L1₂ precipitate through multiple additions with Zr and Er, a finding supported by atom-probe tomography, which reveals a synergistic interaction between Er and Y. The Er and Y multi-addition increases the number density of fine L1₂-Al₃(Zr, Er, Y) precipitates, providing heterogeneous nucleation sites for η-type nano-precipitates at the interfaces between L1₂/η precipitate, thereby increasing the formation of fine η-type nano-precipitates during the over-aging period.

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含 Zr、Er 和 Y 的 L12 沉淀对铝锌镁合金在高温下析出的影响

微合金化可通过高温下的溶质分配大大提高纳米析出物的高温性能。在本研究中，我们利用透射电子显微镜和原子探针断层扫描技术研究了含有 Zr、Er 和 Y 的 L12 晶体结构沉淀物对 Al-Zn-Mg 合金沉淀的影响。结果表明，Zr、Er 和 Y 的多重添加可提高析出物的数量密度，防止 L12/η-MgZn2 型纳米析出物在高温过时效期间发生粗化，从而改善铝锌镁合金的常温和高温硬度。特别是，通过与 Zr 和 Er 的多重添加，Y 形成了热稳定的 L12 沉淀，这一发现得到了原子探针层析成像技术的支持，该技术揭示了 Er 和 Y 之间的协同作用。Er 和 Y 的多重添加增加了细小 L12-Al3(Zr,Er,Y)沉淀的数量密度，在 L12/η 沉淀的界面处为 η 型纳米沉淀提供了异质成核点，从而在过时效期间增加了细小 η 型纳米沉淀的形成。

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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.