Imperial College London
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ProfessorChristopherGourlay

Faculty of Engineering, Department of Materials

Professor of Physical Metallurgy
 
 
 
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Contact

 

+44 (0)20 7594 8707c.gourlay

 
 
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Location

 

301DBessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Lin:2023:10.1016/j.jallcom.2022.168571,
author = {Lin, CJ and Peng, L and Xian, JW and Li, Q and Gourlay, CM},
doi = {10.1016/j.jallcom.2022.168571},
journal = {Journal of Alloys and Compounds},
pages = {1--16},
title = {Eutectic solidification in Mg-9Al-0.7Zn: from divorced to coupled growth},
url = {http://dx.doi.org/10.1016/j.jallcom.2022.168571},
volume = {938},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In hypoeutectic Mg-Al-based alloys, Mg17Al12 forms in the last stages of solidification by a eutectic reaction that is usually fully or partially divorced. Here we investigate the nucleation, growth and morphology of the Mg17Al12-containing eutectic in a multicomponent Mg-9Al-0.7Zn-0.2Mn alloy. Under all solidification conditions studied, Mg17Al12 formed an interconnected skeleton in 3D and Mg17Al12 orientation domains spanned multiple α-Mg grains, indicating that Mg17Al12 nucleation events are relatively infrequent. While most regions of α-Mg+Mg17Al12 had no preferred orientation relationship (OR), occasional eutectic regions had the Burgers OR that may be related to the nucleation of Mg17Al12 on α-Mg during solidification. It is shown that the degree of partially divorced growth depends on a simple geometrical measure for the space available for eutectic growth involving the dendrite arm spacing, the eutectic fraction and the eutectic spacing. We then demonstrate that fully coupled eutectic microstructures can be generated in this alloy by independently manipulating the magnesium dendrite solidification time and the eutectic cooling rate.
AU  - Lin,CJ
AU  - Peng,L
AU  - Xian,JW
AU  - Li,Q
AU  - Gourlay,CM
DO  - 10.1016/j.jallcom.2022.168571
EP  - 16
PY  - 2023///
SN  - 0925-8388
SP  - 1
TI  - Eutectic solidification in Mg-9Al-0.7Zn: from divorced to coupled growth
T2  - Journal of Alloys and Compounds
UR  - http://dx.doi.org/10.1016/j.jallcom.2022.168571
UR  - https://www.sciencedirect.com/science/article/pii/S0925838822049623?via%3Dihub
UR  - http://hdl.handle.net/10044/1/102648
VL  - 938
ER  -
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