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dc.contributor.authorLi, HT-
dc.contributor.authorWang, Y-
dc.contributor.authorFan, Z-
dc.identifier.citationActa Materialia, 60(4): 1528 - 1537, Feb 2012en_US
dc.descriptionThis is the post-print version of the Article. The official published version can be accessed from the link below - Copyright @ 2012 Elsevieren_US
dc.description.abstractThe mechanisms involved in the grain refinement of Al–Mg alloys through varying the Mg content and applying intensive melt shearing were investigated. It was found that the oxide formed in Al–Mg alloys under normal melting conditions is MgAl2O4, which displays an equiaxed and faceted morphology with {1 1 1} planes exposed as its natural surfaces. Depending on the Mg content, MgAl2O4 particles exist either as oxide films in dilute Al–Mg alloys (Mg < 1 wt.%) or as naturally dispersed discrete particles in more concentrated Al–Mg alloys (Mg > 1 wt.%). Such MgAl2O4 particles can act as potent sites for nucleation of α-Al grains, which is evidenced by the well-defined cube-on-cube orientation relationship between MgAl2O4 and α-Al. Enhanced heterogeneous nucleation in Al–Mg alloys can be attributed to the high potency of MgAl2O4 particles with a lattice misfit of 1.4% and the increased number density of MgAl2O4 particles due to either natural dispersion by the increased Mg content or forced dispersion through intensive melt shearing. It was also found that intensive melt shearing leads to significant grain refinement of dilute Al–Mg alloys by effective dispersion of the MgAl2O4 particles entrapped in oxide films, but it has marginal effect on the grain refinement of concentrated Al–Mg alloys, where MgAl2O4 particles have been naturally dispersed into individual particles by the increased Mg content.en_US
dc.description.sponsorshipThis study is funded from the EPSRC Grant EP/H026177/1.en_US
dc.subjectAluminium alloysen_US
dc.subjectGrain refinementen_US
dc.subjectHeterogeneous nucleationen_US
dc.subjectSolidification microstructureen_US
dc.subjectOxide particlesen_US
dc.titleMechanisms of enhanced heterogeneous nucleation during solidification in binary Al-Mg alloysen_US
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