Multiple twins of a decagonal approximant embedded in S-Al2CuMg phase resulting in pitting initiation of a 2024Al alloy

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	Multiple twins of a decagonal approximant embedded in S-Al2CuMg phase resulting in pitting initiation of a 2024Al alloy
	J.; Zhang Wang, B.; Zhou, Y. T.; Ma, X. L.
	2015
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	82 页码:22-31
摘要	The pitting of Al-Cu-Mg alloy is believed to originate from the local dissolution of S-Al2CuMg particles, and the dissolution activity differs from one particle to another. Nevertheless, the initial site where the dissolution of the S phase preferentially occurs and the cause of the heterogeneity in the electrochemical dissolution activity remain unknown, hindering our understanding of pitting initiation of Al-Cu-Mg alloys. In this work, we have applied in situ ex-environmental transmission electron microscopy and identified a large number of nanosized Al20Cu2Mn3 approximants of the decagonal quasicrystal embedded in the S phase. We find that the S phase with Al20Cu2Mn3 inclusions is more active than those free of the approximants. Such a preference is clarified to result from the decomposition of Al20Cu2Mn3 approximant prior to the dissolution of the S phase. In addition, we also find that the electrochemical behavior of Al20Cu2Mn3 approximants is different. The approximants with multiple twins are more active than those with few planar defects. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[wang, j. ; zhang, b. ; zhou, y. t. ; ma, x. l.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; ma, xl (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, wenhua rd 72, shenyang 110016, peoples r china. ; xlma@imr.ac.cn
关键词	s Phase Pitting Al20cu2mn3 2024al Multiple Twins Transmission Electron-microscopy S-phase Localized Corrosion Aluminum-alloy Intergranular Corrosion Intermetallic Compounds Chloride Solutions Al Cu Particles
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73949
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J.,Zhang Wang, B.,Zhou, Y. T.,et al. Multiple twins of a decagonal approximant embedded in S-Al2CuMg phase resulting in pitting initiation of a 2024Al alloy[J]. Acta Materialia,2015,82:22-31.
APA	J.,Zhang Wang, B.,Zhou, Y. T.,&Ma, X. L..(2015).Multiple twins of a decagonal approximant embedded in S-Al2CuMg phase resulting in pitting initiation of a 2024Al alloy.Acta Materialia,82,22-31.
MLA	J.,et al."Multiple twins of a decagonal approximant embedded in S-Al2CuMg phase resulting in pitting initiation of a 2024Al alloy".Acta Materialia 82(2015):22-31.