Regulating hardness homogeneity and corrosion resistance of Al-Zn-Mg-Cu alloy via ECAP combined with inter-pass aging

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-26 DOI:10.1016/j.matchar.2024.114489

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引用次数: 0

Abstract

The novel processing strategies of Equal Channel Angular Pressing (ECAP) combined with inter-pass aging was designed, and XRD, SEM, TEM, electrochemical testing, and hardness testing were used to evaluate the relationship between microstructure and performance of alloys in this work. The results indicate that the hardness uniformity of the circular cross-section perpendicular to the extrusion direction was improved by combining ECAP with inter-pass aging, resulting in a hardness inhomogeneity factor (∼0.030) that was lower than that achieved by peak aging and double-stage aging alloys. Polarization curves and electrochemical impedance spectra show that a more negative corrosion potential and a smaller corrosion current density were possessed by the alloy, with the maximum intergranular corrosion depth (IGC) being reduced to 38 μm. Microstructure observation indicates that the improvement in hardness uniformity is due to the uniformity of grain size and the improved distribution and size of the η’ phase, which is attributed to the interaction between the pinning and shear effects of precipitates and dislocations during deformation. The enhanced corrosion resistance was attributed to an orderly combination of deformation and aging that increases the grain boundary volume and disrupts the η phase continuity within grain boundaries.

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通过 ECAP 与层间时效相结合调节铝锌镁铜合金的硬度均匀性和耐腐蚀性能

本研究设计了等通道角压（ECAP）与层间时效相结合的新型加工策略，并采用 XRD、SEM、TEM、电化学测试和硬度测试来评估合金的微观结构与性能之间的关系。结果表明，通过将 ECAP 与层间时效相结合，垂直于挤压方向的圆形截面的硬度均匀性得到了改善，使硬度不均匀系数（∼0.030）低于峰值时效和双阶段时效合金所达到的硬度不均匀系数。极化曲线和电化学阻抗谱显示，合金具有更负的腐蚀电位和更小的腐蚀电流密度，最大晶间腐蚀深度（IGC）减小到 38 μm。显微结构观察表明，硬度均匀性的改善是由于晶粒尺寸的均匀性和η'相分布和尺寸的改善，而η'相的改善是由于变形过程中析出物和位错的针刺效应和剪切效应之间的相互作用。抗腐蚀性的增强归因于变形和老化的有序结合，这种结合增加了晶界体积，破坏了晶界内 η 相的连续性。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.