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3-dimensional atomic structures of the thickening T1-phase precipitates in AlCuLi(Mg) alloys

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

Materials Characterization Pub Date : 2025-04-07 DOI:10.1016/j.matchar.2025.115015

G.S. Chen , S.Y. Li , W.Q. Ming , C.L. Wu , J.H. Chen

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引用次数: 0

Abstract

The plate-like T₁-phase (Al₂CuLi) precipitates are the key strengthening precipitates in the AlCuLi alloys for aerospace applications. However, their 3-dimensional atomic structures are still an issue full of controversy, since the Li positions in the T₁-phase are difficult to determine with the characterization tools available, and since the frequently observed one-unit-cell-thick T₁-phase precipitates are difficult to grow into real 3-dimensional crystals. There exist quite a lot of atomic structural models that need to be clarified or confirmed for the T₁-phase. Here, we report that all Li-atoms in the thickened T₁-phase precipitates can clearly be visualized, and their crystal structures can be determined precisely, using the integrated differential phase contrast scanning transmission electron microscopy (iDPC-STEM). It has been demonstrated that three basic atomic structures are observed in multi-unit-cell-thick (MUCT) T₁-phase precipitates. Other MUCT ones consist of various combinations of these three basic structures, or they represent distinct orientations of the same structure form. The formation of stacking types of T₁-phase precipitates has also been discussed. Our study provides atomic-scale insights into the complex growth mechanisms of T₁-precipitates in AlCuLi alloys.

查看原文本刊更多论文

微积分（Mg）合金中增厚t1相析出物的三维原子结构

片状t1相（Al2CuLi）析出相是航空航天用微积分合金的关键强化析出相。然而，它们的三维原子结构仍然是一个充满争议的问题，因为Li在t1相中的位置很难用现有的表征工具确定，而且由于经常观察到的1单元胞厚的t1相沉淀很难生长成真正的三维晶体。对于t1相，有相当多的原子结构模型需要澄清或确认。在这里，我们报告了使用集成差相对比扫描透射电子显微镜（iDPC-STEM）可以清晰地看到加厚的t1相析出物中的所有li原子，并且可以精确地确定它们的晶体结构。结果表明，在多单元胞厚（MUCT） t1相中可以观察到三种基本的原子结构。其他MUCT由这三种基本结构的各种组合组成，或者它们代表同一结构形式的不同取向。本文还讨论了t1相相堆积类型的形成。我们的研究提供了对微积分合金中t1析出物复杂生长机制的原子尺度的见解。

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

Materials Characterization

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.

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