Brazing mechanism of Al0.1CoCrFeNi with composite structure nano-multilayer foils: Molecular dynamics and experimental perspectives

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-10-19 DOI:10.1016/j.intermet.2025.109030

Baolei Wu , Chengdi Song , Mingkang Wang , FuXiang Li , Weiyuan Yu

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Abstract

A defect-free brazed joint with an FCC + BCC dual-phase solid-solution structure was successfully fabricated using an Al_0.1CoCrFeNi high-entropy alloy (HEA) with novel nano-multilayer foils. This study combined molecular dynamics (MD) simulations and experimental methods to elucidate the interfacial diffusion behavior and microstructure formation mechanism during brazing. MD simulations revealed that joint formation progressed from the initial nano-multilayer structure to a disordered solid solution, followed by wetting from a molten Al phase, and culminating in a solid-solution reaction. Experimentally, the joint microstructure was found to consist primarily of a hard BCC (Al-Ni-rich) phase and ductile FCC (Co-Cr-Fe-rich) phase. The formation of this homogeneous solid-solution zone was attributed to extensive atomic interdiffusion and intense interfacial reactions promoted by the high-entropy effect. The brazed joints exhibited maximum shear strengths of 308.5 MPa at room temperature and 292.8 MPa at 1073 K. This study demonstrated that nano-multilayer foils can effectively serve as HEA filler materials, thereby expanding the potential applications of HEAs and providing a novel and reliable strategy for joining Al_0.1CoCrFeNi HEAs.

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Al0.1CoCrFeNi与复合结构纳米多层箔的钎焊机理：分子动力学和实验观点

采用新型纳米多层箔，以Al0.1CoCrFeNi高熵合金（HEA）为材料，成功制备了FCC + BCC双相固溶结构的无缺陷钎焊接头。本文采用分子动力学模拟和实验相结合的方法，研究了钎焊过程中界面扩散行为和微观结构形成机制。MD模拟表明，节理的形成从最初的纳米多层结构到无序的固溶体，然后从熔融Al相润湿，最终形成固溶体反应。实验发现，接头组织主要由坚硬的BCC（富al - ni）相和韧性的FCC（富co - cr - fe）相组成。这一均相固溶区是由广泛的原子间扩散和高熵效应引起的强烈的界面反应形成的。钎焊接头在室温和1073 K下的最大抗剪强度分别为308.5 MPa和292.8 MPa。该研究表明，纳米多层箔可以有效地作为HEA填充材料，从而扩大了HEAs的潜在应用范围，为连接Al0.1CoCrFeNi HEAs提供了一种新颖可靠的策略。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.