Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 784, Issue -, Pages 527-534Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.01.029
Keywords
Metals and alloys; Solidification; Phase diagrams; Synchrotron radiation; X-ray diffraction; Transmission electron microscopy (TEM)
Categories
Funding
- Australian Research Council (ARC) [LP130100828]
Ask authors/readers for more resources
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 Al5La2, followed by a eutectic with the products alpha-Mg+Al5La2, then a mono-variant binary eutectic with the products alpha-Mg+Mg12La and lastly a ternary eutectic with the products alpha-Mg+Mg12La +(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 Al5La2 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. (C) 2019 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available