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Lithium mapping in a Mg-9Li-4Al-1Zn alloy using electron energy-loss spectroscopy

journal contribution
posted on 2023-08-24, 04:29 authored by Yu Zhang, Laure Bourgeois, Yu Chen, Zhuoran Zeng, Nick Birbilis, Philip NH Nakashima
Magnesium-lithium alloys with high lithium content have been attracting significant attention because of their low density, high formability and corrosion resistance. These properties are dependent on the distribution of lithium, which is difficult to map in the presence of magnesium. In this work, a ratio spectrum-imaging method with electron energy-loss spectroscopy (EELS) is demonstrated, which enables the mapping of lithium. In application to LAZ941 (Mg-9Li-4Al-1Zn in wt.%), this technique revealed that a key precipitate in the microstructure, previously thought by some to be Mg17Al12, is in fact rich in lithium. This result was corroborated with a structural investigation by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), showing this phase to be Al1-xZnxLi, with x<<1. This work indicates the potential offered by this technique for mapping lithium in materials.

History

Journal

Journal of Magnesium and Alloys

Volume

11

Pagination

1170-1179

Location

Amsterdam, The Netherlands

ISSN

2213-9567

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Issue

4

Publisher

Elsevier