Effect of multi-stage aging on the precipitation strengthening and mechanical properties for an Al-Mg-Si-Ag alloy

被引：13
作者：
Chen, Jiahao [1 ]
Cheng, Xiangxiang [1 ]
Ding, Lipeng [2 ]
Weng, Yaoyao [1 ,3 ]
Yin, Jiarong [1 ]
Yao, Hanyu [1 ]
Yu, Hao [1 ]
机构：
[1] Nanjing Inst Technol, Sch Mat Sci & Engn, Nanjing 211167, Peoples R China
[2] Nanjing Tech Univ, Key Lab Light Weight Mat, Nanjing 211816, Peoples R China
[3] Nanjing Inst Technol, Jiangsu Key Lab Adv Struct Mat & Applicat Technol, Nanjing 211167, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2022年 / 190卷
基金：
中国国家自然科学基金;
关键词：
Al-Mg-Si-Ag alloy; Aging hardening; Multi-stage aging; Microstructure; HAADF-STEM; BETA-PHASE; DIFFRACTION PATTERNS; BEHAVIOR; ORIENTATIONS; EVOLUTION;
D O I：
10.1016/j.matchar.2022.112004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Multi-step aging and microalloying are the methods that can effectively facilitate the precipitation strengthening and enhance the performance of Al-Mg-Si alloys. The effect of multi-step aging on the precipitation and properties for an Ag-microalloying Al-Mg-Si alloy is systematically investigated in this article. Controlling temperatures of the primary and secondary aging steps are essential for promoting the effectiveness of the multi-stage aging. The optimal multi-stage aging treatment is identified as: 100 degrees C x 2 h + 180 degrees C x 2 h, which gives a peak hardness of 142.4 HV (13.7 HV higher than that of the single-stage aging) for this alloy. It is demonstrated that the primary aging at 100 degrees C can promote the formation of high density of Cluster(2), and the secondary aging at 180 degrees C accelerates the transformation of Cluster(2) to beta '' caused by the good combination of thermodynamics and kinetics of the transformation. The incorporation of Ag atoms can further promote the nucleation of the beta" phase.
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页数：8
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