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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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.