Effect of Zn addition on microstructure and mechanical properties of Al-Cu-Mg-Ag alloys

被引：0
作者：
Mo, Wenfeng [1 ]
Ouyang, Zuoqiong [1 ]
Pan, Yuzhe [1 ]
Li, Wenting [1 ]
Bai, Zhenhai [1 ,2 ]
Luo, Binghui [1 ,2 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Cent South Univ, Key Lab Nonferrous Met Mat Sci & Engn, Minist Educ, Changsha 410083, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2025年 / 940卷
关键词：
Al-Cu-Mg-Ag alloy; Zn addition; Microstructure evolution; Mechanical properties; STRENGTHENING MECHANISMS; HARDENING BEHAVIOR; ATOMIC-STRUCTURE; OMEGA PHASE; PRECIPITATION; DEFORMATION; EVOLUTION; DIFFUSION; KINETICS; CE;
D O I：
10.1016/j.msea.2025.148492
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Microalloying has proven to be an effective strategy for tailoring the microstructure and mechanical properties of aluminum alloys. A systematic investigation combining metallographic analysis, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) was conducted to elucidate the influence of Zn additions (0-4 wt%) on the microstructure-property relationships in Al-Cu-Mg-Ag alloys. Microstructure investigation revealed that Zn addition alters the precipitation kinetics of Al-Cu-Mg-Ag alloy. Beyond the predominant Omega'/Omega phases, the formation of eta phases was identified in alloys with relatively low Zn/Mg ratios (similar to 1.1). The 4 wt% Zn-containing alloy exhibited maximum tensile strength in peak aged condition (602 +/- 2 MPa) and minimum tensile strength when over aged (480 +/- 6 MPa), attributable to Zn-enhanced precipitation of Omega'/Omega and eta ' phases during peak aging, followed by Omega phase coarsening via Ostwald ripening during over aging. Toughness evolution in peak aged specimens displayed a V-shaped trend with increasing Zn content, correlated with precipitate size refinement characteristics at grain boundaries. Our work provides insights into microalloying can modify microstructure and enhance the mechanical properties of Al-Cu-Mg-Ag alloys.
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页数：14
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