Microstructure evolution and mechanical properties of 5B70 Al alloy induced by micro-arc oxidation

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2026-05-01 Epub Date: 2026-02-10 DOI:10.1016/j.vacuum.2026.115175

Mingjin wu , Lixin Wang , Yao Xie , Chaoyu Han , Libin Ren , Ping Zhu , Chunyin Deng , Zhongbing Chen , Shuhui Wu , Li Lu , Jia Yang

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Abstract

This study focused on the structural heterogeneity of ceramic film formed during micro-arc oxidation (MAO) and its influence on mechanical properties. Using 5B70 Al alloy as the substrate, a systematic investigation was conducted to compare the microstructural features and mechanical performance between the edge transition zone around discharge pores and the ceramic region between pores. The results indicated that the edge transition zone, affected by localized high-temperature discharges, exhibited amorphous/sub-grain structures accompanied by the precipitation of ZrO₂ particles and structural defects. In contrast, the inter-pore ceramic region features fine and dense grains with a high density of dispersed Al₃Sc nanoparticles. Nanoindentation tests revealed that the inter-pore ceramic region demonstrated higher hardness and elastic modulus, whereas the edge transition zone showed reduced local fracture toughness due to microcracks and coarse particle-induced stress concentrations. This study elucidated the coupled mechanism between reinforcement phase evolution and discharge behavior in regulating film properties, providing theoretical guidance for optimizing the MAO process and enhancing the overall performance of ceramic films.

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微弧氧化诱发5B70铝合金组织演变及力学性能

研究了微弧氧化（MAO）过程中陶瓷膜的结构非均质性及其对力学性能的影响。以5B70铝合金为基体，系统研究了放电孔周围边缘过渡区和孔间陶瓷区的组织特征和力学性能。结果表明：受局部高温放电的影响，合金边缘过渡区呈现出非晶/亚晶结构，并伴有ZrO2颗粒的析出和组织缺陷；相比之下，孔间陶瓷区具有细而致密的晶粒和高密度的分散Al3Sc纳米颗粒。纳米压痕测试表明，孔间陶瓷区具有较高的硬度和弹性模量，而边缘过渡区由于微裂纹和粗颗粒引起的应力集中而表现出局部断裂韧性降低。本研究阐明了增强相演化与放电行为对膜性能调节的耦合机制，为优化MAO工艺，提高陶瓷膜的整体性能提供理论指导。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.