Precipitation behavior during low-temperature aging in Al-Mg-Si alloy using STEM-EDS intensity correlograms

被引：1
作者：
Saito, Genki [1 ]
Sano, Yamato [2 ,5 ]
Mizuno, Kazuya [2 ]
Torigoe, Shoma [2 ]
Takata, Ken [2 ]
Okajima, Toshihiro [3 ]
Muto, Shunsuke [1 ,4 ]
机构：
[1] Nagoya Univ, Grad Sch Engn, Furo Cho,Chikusa Ku, Nagoya, Aichi 4648603, Japan
[2] Daido Univ, Dept Mech Engn, 10-3 Takiharucho,Minami Ku, Nagoya, Aichi 4578530, Japan
[3] Aichi Synchrotron Radiat Ctr, 250-3 Minamiyamaguchi Cho, Seto, Aichi 4890965, Japan
[4] Nagoya Univ, Inst Mat & Syst Sustainabil, Adv Measurement Technol Ctr, Furo Cho,Chikusa Ku, Nagoya, Aichi 4648603, Japan
[5] UACJ Corp, 3-1-12 Chitose,Minato Ku, Nagoya, Aichi 4558670, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2025年 / 923卷
基金：
日本学术振兴会;
关键词：
Al-Mg-Si alloys; STEM-EDS; Aging; Cluster; Precipitate; Intensity correlograms; CRYSTAL-STRUCTURE; STRENGTH; ALUMINUM; CLUSTER; PHASE;
D O I：
10.1016/j.msea.2024.147686
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Al-Mg-Si alloys are extensively used in automotive panels because of their high formability and age-hardening capabilities during paint baking. Natural aging that occurs after the solution treatment inhibits formation of (3 '' precipitates during subsequent artificial aging, reducing the hardness. The precipitation behavior of Al-0.65Mg-0.81Si mass% alloy during isothermal aging at 100 degrees C over various durations is investigated in this study using scanning transmission electron microscopy (STEM) and STEM energy-dispersive X-ray spectroscopy (EDS). The analysis reveals the formation of Guinier-Preston (GP) zones and (3 '' precipitates, which influence the mechanical properties of the alloy. After 1 h of aging, no GP zones are observed; however, clusters with diameters of 1.0-1.5 nm formed, increasing and decreasing in density at 10 and 400 h, respectively. Further, (3 ''-related structures with a Mg/Si ratio of -1 started forming at 10 h and grew in number by 400 h, with most particles being spherical and some elongated along the [100]Al direction. These microstructural changes correlate with yield strength variations, highlighting the role of pre-aging in promoting (3 '' formation during subsequent artificial aging. In addition, a novel STEM-EDS intensity correlogram method is introduced to effectively distinguish aging products from the matrix and deepen the understanding of microstructural evolution in Al-Mg-Si alloys.
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页数：9
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