Static and Dynamic Precipitation Behavior of the Al-20wt.% Zn Alloy

The static and dynamic precipitation behavior of solution-treated binary Al-20 wt.% Zn alloy is investigated via artificial aging, cold rolling and artificial aging combined with cold rolling. The solution-treated Al-Zn alloy exhibits high thermal stability during aging, and low densities of nano-si...

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Published inChinese physics letters Vol. 33; no. 5; pp. 63 - 66
Main Author 刘崇宇 江鸿杰 王春霞 亓海全 李义兵 马明臻 刘日平
Format Journal Article
LanguageEnglish
Published 01.05.2016
Subjects
Al-Zn合金
人工老化
动态析出
塑性应变
析出行为
沉淀相
铝锌合金
静态
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/33/5/056101

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Summary:The static and dynamic precipitation behavior of solution-treated binary Al-20 wt.% Zn alloy is investigated via artificial aging, cold rolling and artificial aging combined with cold rolling. The solution-treated Al-Zn alloy exhibits high thermal stability during aging, and low densities of nano-sized Zn particles are precipitated along with AI grain boundaries after aging at 200℃ for 13 h. Compared with static precipitation, dynamic precipitation occurs more easily in the Al-Zn alloy. Zn clusters are obtained after cold rolling at an equivalent plastic strain of 0.6, and the size of the Zn phase reaches hundreds of nanometers when the strain is increased to 12.1. The results show that the speed of static precipitation can be significantly enhanced after the application of 2.9 rolling strain. Grain refinement and defects induced by cold rolling are considered to promote Zn precipitation. The hardness of Al-Zn alloy is also affected by static and dynamic precipitations.
Bibliography:11-1959/O4
Chong-Yu Liu, Hong-Jie Jiang, Chun-Xia Wang, Hai-Quan Qi, Yi-Bing Li, Ming-Zhen Ma,Ri-Ping Liu（1.Key Laboratory of New Processing Technology for Nonferrous Metal ＆ Materials （Ministry of Education）, Guilin University of Technology, Guilin 541004; 2.State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004; 3.Guangxi Key Laboratory of Universities for Clean Metallurgy and Comprehensive Utilization of Nonferrous Metal Resources, Guilin 541004）
The static and dynamic precipitation behavior of solution-treated binary Al-20 wt.% Zn alloy is investigated via artificial aging, cold rolling and artificial aging combined with cold rolling. The solution-treated Al-Zn alloy exhibits high thermal stability during aging, and low densities of nano-sized Zn particles are precipitated along with AI grain boundaries after aging at 200℃ for 13 h. Compared with static precipitation, dynamic precipitation occurs more easily in the Al-Zn alloy. Zn clusters are obtained after cold rolling at an equivalent plastic strain of 0.6, and the size of the Zn phase reaches hundreds of nanometers when the strain is increased to 12.1. The results show that the speed of static precipitation can be significantly enhanced after the application of 2.9 rolling strain. Grain refinement and defects induced by cold rolling are considered to promote Zn precipitation. The hardness of Al-Zn alloy is also affected by static and dynamic precipitations.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/33/5/056101