Preferred corrosion pathways for oxygen in Al2Ca - twin boundaries and dislocations

doi:10.1016/j.jallcom.2022.168296

IMR OpenIR

	Preferred corrosion pathways for oxygen in Al2Ca - twin boundaries and dislocations
	Peter, Nicolas J.1,2; Zander, Daniela 3; Cao, Xumeng 4; Tian, Chunhua 1; Zhang, Siyuan 1; Du, Kui 4; Scheu, Christina 1; Dehm, Gerhard 1
通讯作者	Dehm, Gerhard(dehm@mpie.de)
	2023-03-05
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	936 页码:5
摘要	With an ongoing discussion on the oxygen diffusion along crystal defects remaining, it is difficult to study this phenomenon in Al containing intermetallic materials due to its rapid and passivating oxide formation. We report here the observation of enhanced oxygen diffusion along crystal defects, i.e. dislocations and twin boundaries, in the C15 Al2Ca Laves phase and how the presence of oxygen induces structural changes at these defects. Three main phases were identified and characterized structurally by aberration-corrected, atomic resolution scanning transmission electron microscopy, analytically by energy dispersive X-ray spectroscopy and electron energy loss spectroscopy. Unlike the C15 bulk phase, the twin boundary and dislocation transformed into a few nanometer wide amorphous phase, which depletes in Al and Ca but is highly enriched in oxygen. The dislocation even shows coexistence of the amorphous phase with a simple Al-rich A1 fcc phase. This A1 phase only depletes in Ca, not in Al (Al remains at bulk concentration), and is also enriched in oxygen. The Al-rich A1 phase is coherent with the C15 matrix. Electron energy loss spectroscopy revealed the amorphous phase to be Al2O3. We thereby show as one of the first studies that oxygen diffusion along crystal defects, especially also at the twin boundary can induce the formation of an amorphous oxide along themselves. The identification of oxygen-induced transformation at strained defects has to be considered when the material is exposed to air during plastic deformation at elevated temperatures. (c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
关键词	Intermetallics Atomic scale structure Corrosion Microstructure Transmission electron microscopy Laves phase
资助者	Deutsche Forschungsgemeinschaft (DFG)
DOI	10.1016/j.jallcom.2022.168296
收录类别	SCI
语种	英语
资助项目	Deutsche Forschungsgemeinschaft (DFG)[SFB1394] ; Deutsche Forschungsgemeinschaft (DFG)[409476157]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001055551900004
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/179006
专题	中国科学院金属研究所
通讯作者	Dehm, Gerhard
作者单位	1.Max Planck Inst Iron Res, Max Planck Str 1, D-40237 Dusseldorf, Germany 2.Forschungszentrum Julich, Inst Energy & Climate Res IEK 2, D-52425 Julich, Germany 3.Rhein Westfal TH Aachen, Div Mat Sci & Engn, Chair Corros & Corros Protect, Intzestr 5, D-52072 Aachen, Germany 4.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Peter, Nicolas J.,Zander, Daniela,Cao, Xumeng,et al. Preferred corrosion pathways for oxygen in Al2Ca - twin boundaries and dislocations[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2023,936:5.
APA	Peter, Nicolas J..,Zander, Daniela.,Cao, Xumeng.,Tian, Chunhua.,Zhang, Siyuan.,...&Dehm, Gerhard.(2023).Preferred corrosion pathways for oxygen in Al2Ca - twin boundaries and dislocations.JOURNAL OF ALLOYS AND COMPOUNDS,936,5.
MLA	Peter, Nicolas J.,et al."Preferred corrosion pathways for oxygen in Al2Ca - twin boundaries and dislocations".JOURNAL OF ALLOYS AND COMPOUNDS 936(2023):5.