Microstructure, Mechanical Properties, and Corrosion Behavior in Al-5.6Zn-2.5Mg-1.6Cu-0.2Cr Alloy with Minor Yttrium Addition

被引：0
作者：
Yao, Ting [1 ]
Xiao, Daihong [2 ]
Yan, Yingjie [2 ,3 ]
Liu, Wensheng [2 ]
机构：
[1] Shaanxi Nonferrous Yulin New Mat Grp Co Ltd, Yulin 719099, Peoples R China
[2] Cent South Univ, Powder Met Res Inst, Changsha 410083, Peoples R China
[3] China Nonferrous Met Tianjin New Mat Technol Co Lt, Tianjin 300380, Peoples R China
来源：
MATERIALS | 2025年 / 18卷 / 04期
关键词：
Al-Zn-Mg-Cu-Cr alloy; yttrium addition; microstructure; mechanical properties; corrosion behavior; 7075; ALUMINUM-ALLOY; INTERGRANULAR CORROSION; EVOLUTION;
D O I：
10.3390/ma18040875
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This study systematically investigated the effects of the addition of the rare earth element yttrium (Y) on the microstructural evolution, mechanical properties, and corrosion behavior of as-extruded Al-5.6Zn-2.5Mg-1.6Cu-0.20Cr (wt.%) alloy through comprehensive characterization techniques, including X-ray diffraction (XRD), tensile testing, corrosion analysis, and electron microscopy. Microstructural characterization demonstrated that the incorporation of yttrium resulted in significant refinement of secondary phase particles within the as-extruded alloy matrix. Moreover, quantitative analysis revealed a substantial increase in low-angle grain boundary (LAGB) density, dislocation density, and the formation of subgrain structures. Notably, the volume fraction of eta ' strengthening precipitates showed a marked increase, accompanied by a corresponding reduction in the width of precipitate-free zones (PFZs) along grain boundaries. Following the T74 aging treatment, the alloy with 0.1 wt.% yttrium addition exhibited a remarkable improvement in intergranular corrosion resistance, with the maximum corrosion depth reduced to 107.8 mu m. However, it should be noted that the exfoliation corrosion resistance exhibited an inverse correlation with increasing yttrium content, suggesting a concentration-dependent behavior in corrosion performance.
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页数：15
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