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Materials (Basel). 2018 Aug 13;11(8). pii: E1422. doi: 10.3390/ma11081422.

Aging Response and Precipitation Behavior after 5% Pre-Deformation of an Al-Mg-Si-Cu Alloy.

Jin S1,2, Ngai T3, Li L4, Jia S5, Zhai T6,7, Ke D8.

Author information

1
Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. shuoxunjimmy@outlook.com.
2
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA. shuoxunjimmy@outlook.com.
3
Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. dhni@scut.edu.cn.
4
Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China. liliejun@scut.edu.cn.
5
Center for Aluminum Technology, University of Kentucky, Lexington, KY 40511, USA. shian.jia@gmail.com.
6
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA. tongguang.zhai@uky.edu.
7
Fujian Metal-New Aluminum Technology Co. Ltd. 3# Alloy Road, Wuhushan Industry Area Qingkou Investment Zone, Fuzhou 350000, China. tongguang.zhai@uky.edu.
8
Fujian Metal-New Aluminum Technology Co. Ltd. 3# Alloy Road, Wuhushan Industry Area Qingkou Investment Zone, Fuzhou 350000, China. kdj@vip.163.com.

Abstract

In this study, Al-1.00 Mg-0.65 Si-0.24 Cu alloy was solution heat-treated, water-quenched, and then pre-deformed for 5% before aging. The peak hardness and yield strength of the pre-deformed sample with subsequent artificial aging were similar to that of a T6 condition sample. It was also found that the pre-deformation treatment could inhibit the negative influence of natural aging to some degree. After seven days of natural aging, the pre-deformed sample obtained better peak hardness and yield strength upon artificial aging than the sample without pre-deformation. In addition, the pre-deformation treatment could reduce 50% of the artificial aging time to reach the peak aging condition compared with T6 treatment. For the peak aged condition in the pre-deformed sample, transmission electron microscopy (TEM) observation found two types of precipitates exhibited along the dislocations besides the β″ precipitates in the Al matrix. Both precipitates had disordered atomic arrangements on the ordered subcell (Si network). The disordered precipitates occupied a number of Mg and Si atoms, resulting in less β″ precipitates formed during artificial aging at 180 °C.

KEYWORDS:

Al-Mg-Si-Cu alloy; mechanical properties; pre-deformation; precipitation behavior

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