Oxidation of Aluminium Alloy Melts and Inoculation by Oxide Particles View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-10-10

AUTHORS

Yun Wang, Hu-Tian Li, Zhongyun Fan

ABSTRACT

One of the main concerns in recycling aluminium alloy scrap is the removal of oxide inclusions. Understanding the nature and behaviour of oxide films in the alloy melts is an important step for developing efficient recycling technologies. In this work, characterisation of oxides formed in pure Al and Al–Mg alloy melts was carried out. In commercially pure Al melt, γ-Al2O3 platelets and α-Al2O3 particles were found to form at 750 and 920 °C, respectively. The oxides were in the form of liquid-like films consisting of numerous individual particles. The addition of 0.49 and 0.70 wt% Mg resulted in the formation of MgAl2O4, and the MgAl2O4 particles were {1 1 1} faceted and had a cube-on-cube orientation relationship with α-Al. The MgAl2O4 films were also liquid-like in which large numbers of the particles were held by the melt. Grain refinement was achieved by intensive shearing of the melts prior to solidification. It is believed that intensive melt shearing broke up the oxide films and dispersed the potent oxide particles which in turn enhanced the heterogeneous nucleation, resulting in grain refinement. The potency of the oxide particles and the mechanism of the inoculation by the oxides were discussed on the basis of the TEM results and theoretical analysis of the lattice misfits at the interfaces along specific orientation relationships. More... »

PAGES

653-661

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12666-012-0194-x

DOI

http://dx.doi.org/10.1007/s12666-012-0194-x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1030017209


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