Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys

doi:10.1038/srep39525

CORC > 金属研究所 > 中国科学院金属研究所

	Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys
	Zhang, B.1; Wang, J.1; Wu, B.1; Oguzie, E. E.2; Luo, K.3; Ma, X. L.1
刊名	SCIENTIFIC REPORTS
	2016-12-21
卷号	6 页码:7
ISSN号	2045-2322
DOI	10.1038/srep39525
通讯作者	Zhang, B.(bozhang@imr.ac.cn) ; Ma, X. L.(xlma@imr.ac.cn)
英文摘要	Atomistic chemical inhomogeneities are anticipated to induce dissimilarities in surface potentials, which control corrosion initiation of alloys at the atomic scale. Precise understanding of corrosion is therefore hampered by lack of definite information describing how atomistic heterogeneities regulate the process. Here, using high-angle annular dark-field (HAADF) scanning transmission electron microscope (STEM) and electron energy loss spectroscopy (EELS) techniques, we systematically analyzed the Al20Cu2Mn3 second phase of 2024Al and successfully observed that atomic-scale segregation of Cu at defect sites induced preferential dissolution of the adjacent zones. We define an " atomic-scale galvanic cell", composed of zones rich in Cu and its surrounding matrix. Our findings provide vital information linking atomic-scale microstructure and pitting mechanism, particularly for Al-Cu-Mg alloys. The resolution achieved also enables understanding of dealloying mechanisms and further streamlines our comprehension of the concept of general corrosion.
资助项目	National Natural Science Foundation of China[51101157] ; Innovation Fund in IMR[SCJJ-2013-PY-09] ; SYNL[2016FP14] ; Chinese Academy of Sciences (CAS)
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000390322400001
资助机构	National Natural Science Foundation of China ; Innovation Fund in IMR ; SYNL ; Chinese Academy of Sciences (CAS)
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/123524]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, B.; Ma, X. L.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci SYNL, Wenhua Rd 72, Shenyang 110016, Peoples R China 2.Fed Univ Technol Owerri, Dept Chem, Electrochem & Mat Sci Res Lab, PMB 1526, Owerri, Nigeria 3.Guilin Univ Technol, Guangxi Key Lab Univ Clean Met Comprehens Utiliza, Guilin 541004, Peoples R China
推荐引用方式 GB/T 7714	Zhang, B.,Wang, J.,Wu, B.,et al. Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys[J]. SCIENTIFIC REPORTS,2016,6:7.
APA	Zhang, B.,Wang, J.,Wu, B.,Oguzie, E. E.,Luo, K.,&Ma, X. L..(2016).Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys.SCIENTIFIC REPORTS,6,7.
MLA	Zhang, B.,et al."Direct observation of atomic-scale origins of local dissolution in Al-Cu-Mg alloys".SCIENTIFIC REPORTS 6(2016):7.