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dc.contributor.authorBolzoni, Leandroen_NZ
dc.contributor.authorHari Babu, Nadendlaen_NZ
dc.date.accessioned2019-01-17T22:08:14Z
dc.date.available2018-01-01en_NZ
dc.date.available2019-01-17T22:08:14Z
dc.date.issued2018en_NZ
dc.identifier.citationBolzoni, L., & Hari Babu, N. (2018). Efficacy of Borides in Grain Refining Al-Si Alloys. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. https://doi.org/10.1007/s11661-018-5017-1en
dc.identifier.issn1073-5623en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/12279
dc.description.abstractThe grain refining efficacy of titanium, aluminum, and niobium borides, as well as niobium aluminides, introduced via commercial and lab made master alloys on Al-Si alloys was investigated. Significant grain refinement is achieved via the introduction of these heterogeneous nuclei regardless of their chemistry, stoichiometry of the master alloy, and addition rate. However, the grain refinement is affected by variable such as contact time, as the inoculating particle may sediment or be poisoned, and cooling rate. Specifically, a faster cooling rate generally leads to finer grains due to the lower time for grain growth. In the case of borides, the chemical inoculation efficiency is greatly affected by their thermodynamic stability in molten Al-Si alloys. Conversely, the grain refining potency of properitectic Al3Nb remains unaffected. The underlying grain refining mechanism was finally investigated using current models based on the growth restriction factor Q to simultaneously consider the effect of nucleant potency and alloy chemistry. Among Ti-, Al-, and Nb-based borides with similar particle size and distribution, the latter are the most efficient to grain refine Al-Si alloys.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.rights© The Author(s) 2018
dc.titleEfficacy of Borides in Grain Refining Al-Si Alloysen_NZ
dc.typeJournal Article
dc.identifier.doi10.1007/s11661-018-5017-1en_NZ
dc.relation.isPartOfMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Scienceen_NZ
pubs.elements-id230973
pubs.publication-statusAccepteden_NZ


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