Optimization of combined properties of aluminum matrix and interface in an aluminum/steel bimetal via low temperature aging

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2024-11-23 DOI:10.1007/s10853-024-10459-0

Yumeng Chen, Yudong Cao, Kaixuan Chen, Xiaocong Kuang, Hong Xu, Guowei Zhang, Xiaoyan Ren, Yuzhi Zhu, Xiaohua Chen, Zidong Wang

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引用次数: 0

Abstract

The effects of varied aging treatments are investigated on microstructure and properties in a ZL702A/SUS304 steel bimetal. Si and Al₂Cu precipitates are detected in aluminum matrix after peak aging at 80 °C, 120 °C, and 160 °C, all of which yield close hardness within 77 ~ 79 HV. Notably, 80 °C peak aging produces finer, denser, and more uniform precipitates, stemming from the better thermodynamic and kinetic precipitation conditions. A thin oxidation layer is generated at AlFe(Si) transition layer/steel matrix interface after solid solution treatment. The layer remains in thinness (< 1 μm) under 80 °C peak aging but seriously thickens under 120 °C (avg. 16.2 μm) and 160 °C (avg. 12.9 μm), ascribed to the varied diffusion and oxidation kinetics. This generates higher average shear strength of 38.2 MPa in former than that of 28.5 MPa in latter. Fractography indicate fracture under shear loading propagates at thin oxidation layer and occasionally to steel side in 80 °C low temperature bimetal, relieving the devastating fracturing completely through thick fragile oxidation layer in 120 °C and 160 °C peak-aged ones. This work highlights low temperature aging strategy for fine precipitation hardening in aluminum and meantime maintaining a good interfacial bonding of aluminum/steel bimetal.

Graphical abstract

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低温时效优化铝/钢双金属中铝基体和界面的综合性能

研究了不同时效处理对ZL702A/SUS304钢双金属组织和性能的影响。在80℃、120℃和160℃峰时效后，铝基体中有Si和Al2Cu析出，硬度在77 ~ 79 HV之间。值得注意的是，由于更好的热力学和动力学沉淀条件，80℃峰时效产生了更细、更致密、更均匀的析出物。固溶处理后，在AlFe（Si）过渡层/钢基体界面处形成一层薄薄的氧化层。在80°C峰时效条件下，该层厚度保持在1 μm左右，但在120°C（平均16.2 μm）和160°C（平均12.9 μm）峰时效条件下，由于扩散和氧化动力学的变化，该层厚度大幅增加。前者的平均抗剪强度为38.2 MPa，高于后者的28.5 MPa。断口形貌表明，80℃低温双金属剪切载荷下的断口在薄氧化层处扩展，偶有向钢侧延伸，通过120℃和160℃峰时效层的厚脆性氧化层完全解除了破坏性断裂。本研究提出了低温时效策略，在保持铝/钢双金属良好界面结合的同时，实现铝的细沉淀硬化。图形抽象

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.