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
Corresponding AuthorZhang, B.( ; Ma, X. L.(
AbstractAtomistic 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.
Funding OrganizationNational Natural Science Foundation of China ; Innovation Fund in IMR ; SYNL ; Chinese Academy of Sciences (CAS)
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[51101157] ; Innovation Fund in IMR[SCJJ-2013-PY-09] ; SYNL[2016FP14] ; Chinese Academy of Sciences (CAS)
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000390322400001
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhang, B.; Ma, X. L.
Affiliation1.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
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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.
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