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- Title
STEM-EELS/EDS Chemical Analysis of Solute Clusters in a Dilute Mille-Feuille- Type Mg-Zn-Y Alloy.
- Authors
Sato, Yohei K.; Daisuke Egusa; Hidetoshi Miyazaki; Koji Kimura; Mitsuhiro Itakura; Masami Terauchi; Eiji Abe
- Abstract
Dilute MgZnYalloy with a mille-feuille structure (MFS) exhibits a mechanical strength comparable to MgZnYalloy with long period stacking/ordered (LPSO) structure through kink deformation. In order to deepen understanding the thermal stability of the MFS-type Mg alloys, it is required to clarify the solute cluster structures composed of Zn and Y in solute enriched stacking faults (SESFs). In this study, electron energy-loss and energy dispersive X-ray spectroscopy based on scanning transmission electron microscopy (STEM-EELS/EDS) were conducted to investigate the electronic structure and composition of Zn and Y in the SESFs of the MFS-Mg alloy. Zn-L2,3 spectra indicated that the valence charges of Zn in the dilute Mg alloy were different from that of the LPSO-type MgZnYalloy. In addition, the intensity ratio of L3/L2 in Y-L2,3 spectrum of the dilute MFS-Mg alloy was larger than that of the LPSO-Mg alloy, reflecting the electron occupancies of 4d3/2 and 4d5/2 orbitals of Y atoms were different from those of the LPSO-Mg alloys. STEM-EELS analysis of the SESF composition in the dilute MFS-Mg alloy indicated that the Zn/Y ratio should be lower than that of the LPSO-Mg alloy, which was confirmed also by STEM-EDS measurements. These results indicate that the cluster structure in the SESFs of the dilute MFS-Mg alloy should be different from the ideal Zn6Y8 cluster in the LPSOtype MgZnY alloys.
- Subjects
DILUTE alloys; SCANNING transmission electron microscopy; ENERGY dispersive X-ray spectroscopy; ANALYTICAL chemistry; ALLOYS; ELECTRON energy loss spectroscopy
- Publication
Materials Transactions, 2023, Vol 64, Issue 5, p950
- ISSN
1345-9678
- Publication type
Article
- DOI
10.2320/matertrans.MT-MD2022023