A bidirectional-modification strategy for enhancing the reliability of thermoplastic-metal hybrid joint from atomic-scale

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY Composites Part B: Engineering Pub Date : 2024-08-26 DOI:10.1016/j.compositesb.2024.111795

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Abstract

In this study, a strategy towards thermoplastic-metal hybrid joint via bidirectional modification for high reliability was designed. The chemical bond behavior and conditions at the interface were explored from atomic scale using density functional theory (DFT) calculation. Based on the bonding mechanism, the AZ31B alloy was oxidized and the carboxyl groups (COOH) were introduced in the resin chain to improve the strength of chemical bond. The mechanical property of the designed joint was significantly improved and the tensile-shear strength achieved 22.7 MPa after bidirectional modification, reaching 4.5 times that of untreated joints. It was mainly attributed to the generation of metal-carboxylate bridging complex—a typical strong coordination bond formed between two O atoms in COOH and two diagonal magnesium atoms in MgO. Experimental evidence also suggested the generation of new chemical bond at the CFRTP/AZ31B interface. Finally, the bidirectional modification was proved to be an efficient and reliable method with high industrial adaptability. The current work opened up a novel direction for reliability promotion of thermoplastic-metal hybrid structures.

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从原子尺度提高热塑性塑料-金属混合接头可靠性的双向改性策略

本研究设计了一种通过双向改性实现高可靠性热塑性塑料-金属混合接头的策略。利用密度泛函理论（DFT）计算从原子尺度探讨了界面上的化学键行为和条件。根据键合机理，对 AZ31B 合金进行了氧化处理，并在树脂链中引入了羧基（COOH），以提高化学键的强度。双向改性后，设计接头的力学性能显著提高，拉伸剪切强度达到 22.7 兆帕，是未处理接头的 4.5 倍。这主要归功于金属-羧酸桥接复合物的生成--COOH 中的两个 O 原子和 MgO 中的两个对角镁原子之间形成了典型的强配位键。实验证据还表明，在 CFRTP/AZ31B 界面上产生了新的化学键。最后，双向改性被证明是一种高效可靠的方法，具有很高的工业适应性。目前的工作为提高热塑性金属混合结构的可靠性开辟了新的方向。

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来源期刊

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.