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Title: Enhanced heterogeneous nucleation on oxides in Al alloys by intensive shearing
Authors: Li, HT
Wang, Y
Fan, Z
Keywords: Heterogeneous nucleation;Grain refinement;Oxide particles;α-Al phase
Issue Date: 2011
Publisher: IOP Publishing
Citation: IOP Conference Series: Materials Science and Engineering, 27: 012047, (2011)
Abstract: Oxides, in liquid aluminium alloys, can cause severe difficulties during casting, contribute to the formation of cast defects and degrade the mechanical properties of cast components. In this paper, microstructural characteristics of naturally occurring oxides in the melts of commercial purity aluminium and Al-Mg binary alloys have been investigated. They are characterised by densely populated oxide particles within liquid oxide films. With intensive shearing, the particle agglomerates are dispersed into uniformly distributed individual particles. It was found that with intensive melt shearing, grain refinement of α-Al can be achieved by the dispersed oxide particles. The smaller lattice misfit between the oxide particles and the α-Al phase is characterised by a well defined crystallographic orientation relationship. And the mechanisms of grain refinement are discussed.
ISSN: 1757-8981
Appears in Collections:Brunel Centre for Advanced Solidification Technology (BCAST)

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