Microstructure, wear and corrosion behavior of AZ91D magnesium alloys fabricated by laser surface-modification

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-01-29 DOI:10.1016/j.surfcoat.2025.131863

Boxiang Hong , Duncai Bao , Chenfeng Yuan , Lipeng Jiang , Qian Li , Xun Zhang , Xiang Li , Zhaoxue Deng

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引用次数: 0

Abstract

Magnesium alloys has been presented to have promising application value. Their use, however, is severely hindered by their poor wear and corrosion resistance. Herein, the Ti₃Ni_2.5Al₂Cu_2.5 medium entropy alloy (MEA) coating with good metallurgical properties have been successfully prepared on the surface of AZ91D magnesium alloy by laser cladding. Furthermore, the Cu-Al transition layer was further designed to overcome the problem of high dilution rate in the cladding process. A systematic analysis was performed on the microstructure, element distribution, microhardness, wear behavior and corrosion resistance. The results showed that the Cu-Al transition layer was composed of Cu₃Al₂, AlCuMg and Cu₂Mg phases and it could effectively solve the problems of micro-cracks and magnesium dilution caused by cladding of high melting point material. The phase composition of the top layer in Ti₃Ni_2.5Al₂Cu_2.5 MEA coating included BCC structural phase, B2 structural phase and (Cu, Ni) Ti intermetallic compound. The microhardness of Ti₃Ni_2.5Al₂Cu_2.5 MEA coating was 562.45 ± 15.02 HV_0.3, which was about 9 times higher than that of the substrate (60.05 ± 9.02 HV_0.3). More remarkable, the prepared MEAs coating significantly improve the corrosion and wear resistance ability of the AZ91D substrate.

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镁合金具有广阔的应用价值。然而，它们的耐磨性和耐腐蚀性较差，严重阻碍了它们的应用。在此，通过激光熔覆技术在 AZ91D 镁合金表面成功制备了具有良好冶金性能的 Ti3Ni2.5Al2Cu2.5 中熵合金 (MEA) 涂层。此外，还进一步设计了铜铝过渡层，以克服熔覆过程中的高稀释率问题。对微观结构、元素分布、显微硬度、磨损行为和耐腐蚀性能进行了系统分析。结果表明，Cu-Al 过渡层由 Cu3Al2、AlCuMg 和 Cu2Mg 相组成，能有效解决高熔点材料堆焊时产生的微裂纹和镁稀释问题。Ti3Ni2.5Al2Cu2.5 MEA 涂层表层的相组成包括 BCC 结构相、B2 结构相和（铜、镍）Ti 金属间化合物。Ti3Ni2.5Al2Cu2.5 MEA 涂层的显微硬度为 562.45 ± 15.02 HV0.3，是基体（60.05 ± 9.02 HV0.3）的约 9 倍。更重要的是，制备的 MEAs 涂层显著提高了 AZ91D 基体的耐腐蚀性和耐磨性。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.