Bake hardening behavior and precipitation kinetic of a novel Al-Mg-Si-Cu aluminum alloy for lightweight automotive body

被引：76
作者：
Li, Hui [1 ,2 ]
Yan, Zhaohui [2 ]
Cao, Lingyong [2 ]
机构：
[1] Yantai Nanshan Univ, Coll Engn, Yantai 265700, Shandong, Peoples R China
[2] Shandong Nanshan Aluminum Co Ltd, Natl Engn Res Ctr Plast Working Aluminum Alloys, Yantai 265713, Shandong, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 728卷
关键词：
Al-Mg-Si-Cu aluminum alloy; Natural aging; Pre-aging treatment; Bake hardening response; Precipitation kinetic; STORAGE TIME; TEMPERATURE;
D O I：
10.1016/j.msea.2018.05.014
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The natural aging (NA) phenomena and its negative effect on bake hardening (BH) response, and a wide temperature/time range of pre-aging (PA) treatment on a novel Al-Mg-Si-Cu automotive aluminum alloy were investigated systematically by micro-hardness measurement, tensile test, transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) analysis. The precipitation kinetic of main strengthening beta '' phase was calculated according DSC curves based on JMA (Johnson-Mehl-Avrami) equation. The results indicate that artificial aging (AA) immediately after solution treatment is helpful to achieve good BH response, while aging temperature and time determine the value and arrival time of peak hardness. BH value is decreased with increase of NA time. BH value is ranging from 40 MPa to 110 MPa after different PA treatment, and the optimal one is obtained while PA at 160 degrees C for 10 min. The precipitation activation energy of beta '' phase of T4P state (160 degrees C/10 min) is reduced about 42 kJ/mol compared to T4 state, which is attributed to the increase of GP region size during PA treatment.
引用
收藏
页码：88 / 94
页数：7
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