Characterization of Precipitation in Al-Li Alloy AA2195 by means of Atom Probe Tomography and Transmission Electron Microscopy
Joint Authors
Khushaim, Muna
Boll, Torben
Seibert, Judith
Haider, Ferdinand
Al-Kassab, Talaat
Source
Advances in Condensed Matter Physics
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-06-22
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
The microstructure of the commercial alloy AA2195 was investigated on the nanoscale after conducting T8 tempering.
This particular thermomechanical treatment of the specimen resulted in the formation of platelet-shaped T1Al2CuLi/θ′Al2Cu precipitates within the Al matrix.
The electrochemically prepared samples were analyzed by scanning transmission electron microscopy and atom probe tomography for chemical mapping.
The θ′ platelets, which are less than 2 nm thick, have the stoichiometric composition consistent with the expected Al2Cu equilibrium composition.
Additionally, the Li distribution inside the θ′ platelets was found to equal the same value as in the matrix.
The equally thin T1 platelet deviates from the formula (Al2CuLi) in its stoichiometry and shows Mg enrichment inside the platelet without any indication of a higher segregation level at the precipitate/matrix interface.
The deviation from the (Al2CuLi) stoichiometry cannot be simply interpreted as a consequence of artifacts when measuring the Cu and Li concentrations inside the T1 platelet.
The results show rather a strong hint for a true lower Li and Cu contents, hence supporting reasonably the hypothesis that the real chemical composition for the thin T1 platelet in the T8 tempering condition differs from the equilibrium composition of the thermodynamic stable bulk phase.
American Psychological Association (APA)
Khushaim, Muna& Boll, Torben& Seibert, Judith& Haider, Ferdinand& Al-Kassab, Talaat. 2015. Characterization of Precipitation in Al-Li Alloy AA2195 by means of Atom Probe Tomography and Transmission Electron Microscopy. Advances in Condensed Matter Physics،Vol. 2015, no. 2015, pp.1-11.
https://search.emarefa.net/detail/BIM-1052293
Modern Language Association (MLA)
Khushaim, Muna…[et al.]. Characterization of Precipitation in Al-Li Alloy AA2195 by means of Atom Probe Tomography and Transmission Electron Microscopy. Advances in Condensed Matter Physics No. 2015 (2015), pp.1-11.
https://search.emarefa.net/detail/BIM-1052293
American Medical Association (AMA)
Khushaim, Muna& Boll, Torben& Seibert, Judith& Haider, Ferdinand& Al-Kassab, Talaat. Characterization of Precipitation in Al-Li Alloy AA2195 by means of Atom Probe Tomography and Transmission Electron Microscopy. Advances in Condensed Matter Physics. 2015. Vol. 2015, no. 2015, pp.1-11.
https://search.emarefa.net/detail/BIM-1052293
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1052293