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dc.contributor.authorBolzoni, Leandroen_NZ
dc.contributor.authorXia, Mingxuen_NZ
dc.contributor.authorHari Babu, Nadendlaen_NZ
dc.date.accessioned2017-01-04T20:39:39Z
dc.date.available2016en_NZ
dc.date.available2017-01-04T20:39:39Z
dc.date.issued2016en_NZ
dc.identifier.citationBolzoni, L., Xia, M., & Hari Babu, N. (2016). Formation of equiaxed crystal structures in directionally solidified Al-Si alloys using Nb-based heterogeneous nuclei. Scientific Reports. http://doi.org/10.1038/srep39554en
dc.identifier.issn2045-2322en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/10829
dc.description.abstractThe design of chemical compositions containing potent nuclei for the enhancement of heterogeneous nucleation in aluminium, especially cast alloys such as Al-Si alloys, is a matter of importance in order to achieve homogeneous properties in castings with complex geometries. We identified that Al3Nb/NbB2 compounds are effective heterogeneous nuclei and are successfully produced in the form of Al-2Nb-xB (x = 0.5, 1 and 2) master alloys. Our study shows that the inoculation of Al-10Si braze alloy with these compounds effectively promotes the heterogeneous nucleation of primary α-Al crystals and reduces the undercooling needed for solidification to take place. Moreover, we present evidences that these Nb-based compounds prevent the growth of columnar crystals and permit to obtain, for the first time, fine and equiaxed crystals in directionally solidified Al-10Si braze alloy. As a consequence of the potent heterogeneous particles, the size of the α-Al crystals was found to be less dependent on the processing conditions, especially the thermal gradient. Finally, we also demonstrate that the enhanced nucleation leads to the refinement of secondary phases such as eutectic silicon and primary silicon particles.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherNature Publishing Group: Open Access Journals - Option Cen_NZ
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
dc.titleFormation of equiaxed crystal structures in directionally solidified Al-Si alloys using Nb-based heterogeneous nucleien_NZ
dc.typeJournal Article
dc.identifier.doi10.1038/srep39554en_NZ
dc.relation.isPartOfScientific Reportsen_NZ
pubs.elements-id144929
uow.identifier.article-nosrep39554


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