Improving deformability of brittle intermetallics via introducing mobile dislocations across coherent interfaces

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

Scripta Materialia Pub Date : 2025-03-16 DOI:10.1016/j.scriptamat.2025.116638

Ke Xu , Anand Mathew , Zhongxia Shang , Yifan Zhang , Chao Shen , Benson Kunhung Tsai , Jianan Shen , Haiyan Wang , Xinghang Zhang

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Abstract

Intermetallics are generally brittle at room temperature, severely limiting their applications. Using CoAl 100 nm/Fe 10 nm nanolaminate as a model system, we demonstrate a strategy for improving deformability of brittle intermetallics via introducing mobile dislocations across coherent interfaces. High-density pre-existing mobile dislocations are introduced into Fe layers via ion peening. In situ micropillar compression tests show the model system has high yield strength, 3.5 GPa, and sustainable work hardening to 5 GPa with substantial uniform plastic deformation, exhibiting superior strength-deformability synergy. Transmission electron microscopy studies reveal the mobile dislocations continuously propagate from Fe into CoAl across the coherent interface, accommodating the considerable plastic deformation. This study provides a fresh perspective for enhancing room temperature plasticity in a wide range of brittle materials.

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通过引入相干界面上的移动位错提高脆性金属间化合物的变形能力

金属间化合物通常在室温下易碎，严重限制了它们的应用。以CoAl 100 nm/Fe 10 nm纳米层合材料为模型体系，我们展示了一种通过在相干界面上引入移动位错来提高脆性金属间化合物变形能力的策略。通过离子强化将高密度的预先存在的移动位错引入到铁层中。现场微柱压缩试验表明，该模型体系具有较高的屈服强度（3.5 GPa）和持续加工硬化至5 GPa，塑性变形相当均匀，表现出优异的强度-变形能力协同效应。透射电镜研究表明，移动位错通过相干界面从Fe连续传播到煤中，从而适应了相当大的塑性变形。该研究为提高各种脆性材料的室温塑性提供了新的视角。

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.