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Microstructure control and ductility improvement of La-Al-(Cu,Ni) composites by Bridgman solidification
journal contributionposted on 2005-05-01, 00:00 authored by Y Zhang, Wei XuWei Xu, H Tan, Y Li
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.
Pagination2607 - 2616
LocationAmsterdam, The Netherlands
Publication classificationC1.1 Refereed article in a scholarly journal
Copyright notice2005, Acta Materialia Inc.
Science & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceBridgman solidificationBulk metallic glassEutecticCompositeLa based alloyBULK METALLIC GLASSESMECHANICAL-PROPERTIESENHANCED PLASTICITYALLOYSMechanical EngineeringCondensed Matter Physics