Effect of minor Sc addition on microstructure and stress corrosion cracking behavior of medium strength Al-Zn-Mg alloy

doi:10.1016/j.jmst.2017.11.042

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	Effect of minor Sc addition on microstructure and stress corrosion cracking behavior of medium strength Al-Zn-Mg alloy
	Li, ZM ; Jiang, HC ; Wang, YL ; Zhang, D ; Yan, DS ; Rong, LJ
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2018-07-01
卷号	34 期号:7 页码:1172-1179
关键词	Aluminium alloy Al-3(Sc, Zr, Ti) Recrystallization Stress corrosion cracking
ISSN号	1005-0302
DOI	10.1016/j.jmst.2017.11.042
英文摘要	Influence of Sc content on microstructure and stress corrosion cracking behavior of medium strength Al-Zn-Mg alloy have been investigated by optical microscopy, scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy and slow strain rate test. The results indicate that the addition of Sc results in the formation of the quaternary coherent Al-3(Sc, Zr, Ti) dispersoids during homogenization treatment, which will inhibit the dynamic recrystallization behavior. The number density of Al-3(Sc, Zr, Ti) particles increases with the increase of Sc content, and thus the recrystallization fraction of hot-extruded alloy is reduced and the peak strength in two-stage artificial aging sample is enhanced. At the same time, the wide of precipitation free zone is reduced, and the content of Zn and Mg in grain boundary particles and precipitation free zone is increased with the increase of Sc content. In peak-aged state, the 0.06 wt% Sc added alloy shows the better stress corrosion cracking resistance than the Sc-free alloy because of the reduction of recrystallization fraction and the interrupted distribution of grain boundary precipitates along grain boundary. However, the further addition of Sc to 0.11 wt% will result in the deterioration of stress corrosion cracking resistance due to the increase of electrochemical activity of grain boundary particles and precipitation free zone as well as hydrogen embrittlement. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000434132800014
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/80134]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li, ZM,Jiang, HC,Wang, YL,et al. Effect of minor Sc addition on microstructure and stress corrosion cracking behavior of medium strength Al-Zn-Mg alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2018,34(7):1172-1179.
APA	Li, ZM,Jiang, HC,Wang, YL,Zhang, D,Yan, DS,&Rong, LJ.(2018).Effect of minor Sc addition on microstructure and stress corrosion cracking behavior of medium strength Al-Zn-Mg alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,34(7),1172-1179.
MLA	Li, ZM,et al."Effect of minor Sc addition on microstructure and stress corrosion cracking behavior of medium strength Al-Zn-Mg alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 34.7(2018):1172-1179.