激光粉末床熔合AZ91镁合金的显微组织和电化学行为

IF 13.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2025-09-23 DOI:10.1016/j.jma.2025.08.002

R. Reyes-Riverol, G. Callaghan, F.R. García-Galván, Á. Triviño-Peláez, J. Medina, G. Williams, J.A. Jiménez, S. Fajardo

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引用次数: 0

摘要

通过与铸态AZ91镁合金的纵、横截面对比，研究了激光粉末床熔合AZ91镁合金的腐蚀行为。显微组织分析表明，LPBF样品中Mg17Al12分布均匀，而铸态合金中Mg17Al12分布呈网状。电化学和析氢测试表明，LPBF截面没有明显的各向异性，但其腐蚀速率高于铸造合金。动电位极化和电化学阻抗谱证实了腐蚀过程受Mg17Al12相分数的阴极控制。扫描振动电极技术进一步验证了这些发现，表明铸态AZ91合金的电化学活性较低。

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Microstructure and electrochemical behavior of AZ91 Mg Alloy produced by laser powder bed fusion

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Microstructure and electrochemical behavior of AZ91 Mg Alloy produced by laser powder bed fusion

The corrosion behavior of the laser powder bed fusion (LPBF) AZ91 magnesium alloy was investigated by comparing its longitudinal and transverse sections with the cast AZ91 alloy. Microstructural analysis revealed a fine, homogeneous Mg₁₇Al₁₂ distribution in LPBF samples, contrasting with the network-like structure in the cast alloy. Electrochemical and hydrogen evolution tests demonstrated no significant anisotropy in LPBF sections, but they exhibited higher corrosion rates than the cast alloy. Potentiodynamic polarization and electrochemical impedance spectroscopy confirmed that the corrosion process was cathodically controlled by the Mg₁₇Al₁₂ phase fraction. Scanning vibrating electrode technique further validated these findings, highlighting lower electrochemical activity in cast AZ91 alloy.

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.