Solidification path and microstructure evolution of Mg-3Al-14La alloy: Implications for the Mg-rich corner of the Mg-Al-La phase diagram

Wong, C, Nogita, K, Styles, M, Zhu, S, Qiu, D, McDonald, S, Gibson, M, Abbott, T and Easton, M 2019, 'Solidification path and microstructure evolution of Mg-3Al-14La alloy: Implications for the Mg-rich corner of the Mg-Al-La phase diagram', Journal of Alloys and Compounds, vol. 784, pp. 527-534.


Document type: Journal Article
Collection: Journal Articles

Title Solidification path and microstructure evolution of Mg-3Al-14La alloy: Implications for the Mg-rich corner of the Mg-Al-La phase diagram
Author(s) Wong, C
Nogita, K
Styles, M
Zhu, S
Qiu, D
McDonald, S
Gibson, M
Abbott, T
Easton, M
Year 2019
Journal name Journal of Alloys and Compounds
Volume number 784
Start page 527
End page 534
Total pages 8
Publisher Elsevier BV
Abstract The solidification path and microstructure evolution in Mg-3Al-14La alloy have been investigated by in-situ synchrotron radiography, thermal analysis and characterisation of the final microstructure. It is shown that the solidification sequence begins with the precipitation of primary Al 5 La 2 , followed by a eutectic with the products α-Mg+Al 5 La 2 , then a mono-variant binary eutectic with the products α-Mg+Mg 12 La and lastly a ternary eutectic with the products α-Mg+Mg 12 La +(Al,Mg) 3 La. This solidification sequence is found to be significantly different to the current Mg-Al-La thermodynamic description. The two main discrepancies are: (i) with Al 5 La 2 being the primary phase, the Mg-3Al-14La alloy is a hyper-eutectic alloy rather than a hypo-eutectic alloy as currently described and (ii) the (Al,Mg) 3 La phase, which was recently identified as a new phase in the Mg-Al-La system, is also present in the Mg-3Al-14La alloy. The results from this study will be useful for the improvement of the current thermodynamic description of the Mg-Al-La system.
Subject Metals and Alloy Materials
Manufacturing Engineering not elsewhere classified
Keyword(s) Metals and alloys
Solidification
Phase diagrams
Synchrotron radiation
X-ray diffraction
Transmission electron microscopy (TEM)
DOI - identifier 10.1016/j.jallcom.2019.01.029
Copyright notice © 2019 Elsevier B.V.
ISSN 1873-4669
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Altmetric details:
Access Statistics: 13 Abstract Views  -  Detailed Statistics
Created: Mon, 29 Apr 2019, 13:04:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us