Experimental Study of the Solidification Microstructure in the Mg-Rich Corner of Mg-Al-Ce System

Wong, C, Styles, M, Zhu, S, Abbott, T, Nogita, K, McDonald, S, StJohn, D, Gibson, M and Easton, M 2018, 'Experimental Study of the Solidification Microstructure in the Mg-Rich Corner of Mg-Al-Ce System', in D. Orlov et al. (ed.) Magnesium Technology 2018, Phoenix, USA, 11-15th March 2018, pp. 79-85.


Document type: Conference Paper
Collection: Conference Papers

Title Experimental Study of the Solidification Microstructure in the Mg-Rich Corner of Mg-Al-Ce System
Author(s) Wong, C
Styles, M
Zhu, S
Abbott, T
Nogita, K
McDonald, S
StJohn, D
Gibson, M
Easton, M
Year 2018
Conference name TMS Annual Meeting
Conference location Phoenix, USA
Conference dates 11-15th March 2018
Proceedings title Magnesium Technology 2018
Editor(s) D. Orlov et al.
Publisher The Minerals, Metals & Materials Society
Place of publication United States
Start page 79
End page 85
Total pages 7
Abstract The current lack of comprehensive understanding of the microstructure evolution in Mg-Al-Ce alloys hinders the accuracy of thermodynamic predictions. Our investigations have identified shortcomings within the published literature for the Mg-rich end of the Mg-Al-Ce phase diagram. In this study, the microstructure evolution in Mg-Al-Ce alloys has been studied by X-ray diffraction, scanning and transmission electron microscopy. The experimental results are compared with the Scheil- Gulliver prediction calculated using the CALPHAD method. The observed microstructure contains both the binary Al-Ce and Mg-Ce intermetallic phases in these alloys. The solidification sequence, invariant point and the phase boundaries in the liquidus projection of the Mg-Al-Ce phase diagrams that have been reported previously are inconsistent with this study. The hypoeutectic region is smaller compared to the current Mg-Al-Ce phase diagram. In addition, a hexagonal Al5Ce2 phase which is isostructural with Al5La2 has been identified in these alloys. The research addresses some of the current limitations in understanding the effect of Ce, when added in isolation, on microstructure development in Mg-Al based alloys.
Subjects Metals and Alloy Materials
Keyword(s) Magnesium alloys
Microstructure
Phase diagram
Copyright notice © The Minerals, Metals & Materials Society 2018
ISBN 9783319723327
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