The effect of ultrasonic surface rolling on microstructure and corrosion behaviour of selective laser melting-fabricated 2099 aluminium‑lithium alloy

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-10-02 DOI:10.1016/j.surfcoat.2025.132754

Lei Huang , Yanqiang Gou , Yuxuan Wang , Xiankai Meng , Shu Huang , Jianzhong Zhou

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引用次数: 0

Abstract

Selective laser melting (SLM)-fabricated aluminium‑lithium alloys exhibit substantial potential in aerospace applications owing to structure-function integrated characteristics. However, their high chemical activity can increase their corrosion susceptibility and limit service reliability. In this study, ultrasonic surface rolling (USR) is applied to an SLM-fabricated 2099 aluminium‑lithium alloy, revealing the effects of USR on its electrochemical-corrosion behaviour. The USR treatment decreased the surface roughness by 94.76 % and formed a plastic-deformation region of ∼200 μm. In the deformed region, a compressive residual stress was introduced, reaching up to −274 MPa, and the average grain size decreased by 35.16 %. Moreover, in the surface region of the deformed layer, submicron ultrafine equiaxed grains were formed, and a large amount of precipitated θ′ (Al₂Cu) phases were also dissolved and dispersed. The USR-induced corrosion-resistant surface reduced the corrosion current density by ∼16.01 % and increased the polarisation resistance by ∼476.36 %. This improvement can be attributed to the combined effects of USR on the surface-roughness reduction, introduction of compressive residual stress, grain refinement, and θ′ (Al₂Cu) phase dissolution. These findings provide valuable insights into the microstructure evolution induced by USR and its role in enhancing the corrosion resistance of the SLM-fabricated 2099 aluminium‑lithium alloy.

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超声表面轧制对选择性激光熔化2099铝锂合金显微组织和腐蚀行为的影响

选择性激光熔化（SLM）制造的铝锂合金由于其结构-功能集成的特性，在航空航天应用中表现出巨大的潜力。然而，它们的高化学活性增加了它们的腐蚀敏感性，限制了它们的使用可靠性。在这项研究中，超声波表面轧制（USR）应用于slm制造的2099铝锂合金，揭示了USR对其电化学腐蚀行为的影响。USR处理使表面粗糙度降低了94.76%，形成了约200 μm的塑性变形区。变形区存在残余压应力，达到- 274 MPa，平均晶粒尺寸减小35.16%。变形层表面形成亚微米级超细等轴晶粒，并析出大量的θ′（Al2Cu）相溶解和分散。usr诱导的耐腐蚀表面使腐蚀电流密度降低了~ 16.01%，极化电阻提高了~ 476.36%。这种改善可归因于USR对表面粗糙度降低、压缩残余应力的引入、晶粒细化和θ′（Al2Cu）相溶解的综合作用。这些发现为研究USR诱导2099铝锂合金的微观组织演变及其在提高slm制备的2099铝锂合金耐腐蚀性中的作用提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.