Influence of in-situ precipitation on corrosion behaviors of wire arc directed energy deposited Al-Mg(-Sc-Zr)

IF 14.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science & Technology Pub Date : 2025-01-24 DOI:10.1016/j.jmst.2024.12.025

Yubin Zhou, Zewu Qi, Baoqiang Cong, Yuan Zhao, Wei Guo, Zihao Jiang, Hongwei Li, Chaofang Dong, Yucheng Ji, Xing He, Haibo Wang, Sanbao Lin, Xiaoyu Cai, Bojin Qi

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Abstract

The influence of in-situ precipitation on corrosion behaviors of wire arc directed energy deposited (WADED) Al-Mg-(Sc-Zr) was studied. WADED Al-Mg showed a homogeneous microstructure with coarse equiaxed grains. WADED Al-Mg-Sc-Zr exhibited fine equiaxed grains along the molten pool boundary (MPB) and inter-layer zone (ITZ) while coarse equiaxed grains were inside the molten pool. The in-situ precipitation resulted in the primary Al₃(Sc, Zr) aggregated along MPB and ITZ while minor-sized secondary Al₃(Sc, Zr) existed inside the molten pool. WADED Al-Mg-Sc-Zr showed improved electrochemical behavior than Al-Mg. WADED Al-Mg presented random pittings that occurred near dispersed β-Al₃Mg₂. WADED Al-Mg-Sc-Zr exhibited pittings along MPB and ITZ, where Al₃(Sc, Zr) aggregated and induced galvanic corrosion. Corrosion anisotropy was obvious in Al-Mg-Sc-Zr since more MPBs and ITZs make the XOZ plane susceptive to localized corrosion.

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原位沉淀对电弧定向能沉积Al-Mg（-Sc-Zr）腐蚀行为的影响

研究了原位沉淀对电弧定向能沉积（WADED） Al-Mg-(Sc-Zr)腐蚀行为的影响。WADED Al-Mg的显微组织均匀，晶粒粗大等轴。WADED Al-Mg-Sc-Zr在熔池边界（MPB）和层间区（ITZ）表现出细小的等轴晶粒，而熔池内部则表现出粗等轴晶粒。原位析出导致初生Al3（Sc, Zr）沿MPB和ITZ聚集，而在熔池内部存在少量次生Al3（Sc, Zr）。与Al-Mg相比，Al-Mg- sc - zr的电化学性能有所改善。WADED Al-Mg在分散的β-Al3Mg2附近出现随机点蚀。WADED Al-Mg-Sc-Zr沿MPB和ITZ方向出现点蚀，Al3（Sc, Zr）聚集，引起电偶腐蚀。Al-Mg-Sc-Zr的腐蚀各向异性明显，因为较多的MPBs和ITZs使XOZ面容易发生局部腐蚀。

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来源期刊

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

CiteScore

20.00

自引率

11.00%

发文量

995

审稿时长

13 days

期刊介绍： Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.