纳米tio2改性对LPBF 2024铝合金组织及耐蚀性的影响

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-08-09 DOI:10.1016/j.jallcom.2025.182918

Guofeng Jin, Dejun Liu, Gan Tian, Xinzhi Yang, Xiaowei Lei

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引用次数: 0

摘要

激光粉末床熔合2024铝合金的制备受到越来越多的关注，但其柱状枝晶粗大、合金元素偏析严重等问题严重影响了2024铝合金的腐蚀性能，一直是有待解决的难题。本文将TiO2纳米颗粒（NPs）引入到2024合金的LPBF工艺中，有效地触发了非均相形核，获得了1-2 μm的细小等轴晶粒，比未添加TiO2（直径~20 μm）的等轴晶粒小了近一个数量级。同时，由于TiO2 NPs在凝固过程中对溶质原子扩散的阻断作用，减轻了LPBFed 2024合金中Cu严重的枝晶间偏析。结果表明，TiO2的加入降低了钝化膜中的施主密度，使偏析区与Al基体之间的电位差从1.50 V降低到0.88 V，从而显著提高了钝化膜的耐蚀性。本研究克服了LPBF的组织粗大和偏析问题，为增材制造耐蚀铝铜合金铺平了道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Impact of nano-TiO2 modification on the microstructure and corrosion resistance of LPBF 2024 aluminum alloy

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Impact of nano-TiO2 modification on the microstructure and corrosion resistance of LPBF 2024 aluminum alloy

Laser powder bed fusion (LPBF) fabrication of 2024 Al alloy has attracted increasing attention, while the coarse columnar dendrites and severe segregation of alloying elements significantly deteriorate the corrosion performance, remaining to be tough problems to solve. In this work, we introduce TiO₂ nanoparticles (NPs) into the LPBF process of 2024 alloy, which effectively triggers heterogeneous nucleation and obtained fine equiaxed grains with the size of 1-2 μm, near one order of magnitude smaller than that without TiO₂ (diameter of ~20 μm). Meanwhile, the severe interdendritic segregation of Cu in LPBFed 2024 alloy is mitigated owing to the blocking effect of TiO₂ NPs on the diffusion of solute atoms in the solidification process. It is found that the addition of TiO₂ reduces the donor density in passive film, lowers the potential difference between the segregation region and Al matrix from 1.50 V to 0.88 V, and thus notably improves the corrosion resistance. Our work overcomes the coarse microstructure and segregation problems of LPBF, which paves the way for the additive manufacturing of corrosion-resistant Al-Cu alloys.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.