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Title: Grain refining potency of Nb-B inoculation on Al-12Si-0.6Fe-0.5Mn alloy
Authors: Bolzoni, L
Nowak, M
Hari Babu, N
Keywords: Heterogeneous nucleation;Metals and alloys;Microstructure;Nb-B inoculation;Thermal analysis
Issue Date: 2015
Publisher: Elsevier Ltd
Citation: Journal of Alloys and Compounds, 623 pp. 79 - 82, 2015
Abstract: In a recent work we reported that the combined addition of Nb and B has higher grain refinement effectiveness than the addition of these individual chemical elements. In this work a commercial Al-12Si-0.6Fe-0.5Mn alloy is employed to fully characterise the refining potency of Nb-B inoculation. It is found that the addition of Nb powder and KBF4 flux to Al-Si melt introduces potent nuclei with low lattice mismatch with the primary α-Al dendrites (i.e. low undercooling) and, thus, promote noteworthy grain refinement through heterogeneous nucleation. Nb-B inoculation induces a significant increment of the volumetric number of grains, decreases the undercooling needed for solidification and makes the grain size of the Nb-B inoculated material less sensitive to the cooling rate employed to solidify the material.
Description: This article has been made available through the Brunel Open Access Publishing Fund.
ISSN: 0925-8388
Appears in Collections:Brunel OA Publishing Fund
Brunel Centre for Advanced Solidification Technology (BCAST)

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