Reshaping precipitate structure and morphology in an Al-Zn-Mg-Cu alloy through dislocation-precipitate interactions

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

Materials Characterization Pub Date : 2024-10-24 DOI:10.1016/j.matchar.2024.114486

引用次数: 0

Abstract

Mechanical properties of age-hardenable alloys are significantly influenced by the intricate interplay between precipitates and mobile dislocations. This study examined how dislocations interact with nanosized precipitates at the atomic scale in an under-aged Al-Zn-Mg-Cu alloy. Results revealed that precipitates hinder dislocation movement but are also sheared by them during deformation. Furthermore, the sheared precipitates experienced structural collapse and deviated from their usual evolutionary path, forming ordered but non-periodic topologically close-packed structures and altered morphologies. The discoveries provide insights into dislocation-precipitate interactions and strain-induced structural changes, which could inspire strategies to modulate precipitates with tailored microstructures and thereby improved alloy properties.

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通过位错-沉淀相互作用重塑铝锌镁铜合金中的沉淀结构和形态

析出物和移动位错之间错综复杂的相互作用对时效硬化合金的机械性能有重大影响。本研究探讨了位错如何与欠时效铝-锌-镁-铜合金中的纳米沉淀物在原子尺度上相互作用。结果表明，析出物会阻碍位错的移动，但在变形过程中也会受到位错的剪切。此外，剪切析出物经历了结构坍塌，偏离了其通常的演化路径，形成了有序但非周期性的拓扑紧密堆积结构和改变了的形态。这些发现深入揭示了位错与析出物之间的相互作用以及应变诱导的结构变化，可为采用定制微结构调节析出物从而改善合金性能的策略提供启发。

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 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.