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Title: Microstructure control and ductility improvement of La-Al-(Cu, Ni) composites by Bridgman solidification
Authors: Zhang, Y. 
Xu, W.
Tan, H. 
Li, Y. 
Keywords: Bridgman solidification
Bulk metallic glass
La based alloy
Issue Date: May-2005
Citation: Zhang, Y., Xu, W., Tan, H., Li, Y. (2005-05). Microstructure control and ductility improvement of La-Al-(Cu, Ni) composites by Bridgman solidification. Acta Materialia 53 (9) : 2607-2616. ScholarBank@NUS Repository.
Abstract: Microstructure evolutions were experimentally studied as a function of growth velocity and alloy composition in LaxAl14(Cu, Ni)86 - x alloys (x = 57-74). The composition-velocity ranges were determined for the formation of eutectic, amorphous, eutectic + compound, amorphous + dendrite, and eutectic + dendrite. A skewed eutectic coupled zone was found towards the compound phase. A composite structure composed of ductile La dendrites in a matrix of either eutectic or amorphous phase can be produced in hypoeutectic alloys. Compressive tests were performed on amorphous/dendrite and eutectic/dendrite composites. As the volume fraction of dendrites increases, fracture strength linearly decreases and obeys a rule-of-mixtures relationship, whereas plastic strain exhibits an exponential increase. Optimised mechanical properties can be realized through both alloy composition design and well-controlled solidification processing. © 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Source Title: Acta Materialia
ISSN: 13596454
DOI: 10.1016/j.actamat.2005.02.020
Appears in Collections:Staff Publications

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