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Metals 2015, 5(3), 1387-1396; doi:10.3390/met5031387

Effect of Material and Process Atmosphere in the Preparation of Al-Ti-B Grain Refiner by SHS

1
Tecnalia Research & Innovation. Department of Foundry and Steel making, c/Geldo, Edif. 700, E-48160 Derio, Spain
2
CNRS, University of Bordeaux, ICMCB, UPR 9048, F-33600 Pessac cedex, France
3
Tecnalia Research & Innovation. Department of Aerospace, c/Mikeletegi 2, E-20009 Donostia–San Sebastián, Spain
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 4 June 2015 / Revised: 8 July 2015 / Accepted: 16 July 2015 / Published: 30 July 2015
(This article belongs to the Special Issue Casting Alloy Design and Modification)
View Full-Text   |   Download PDF [1140 KB, uploaded 30 July 2015]   |  

Abstract

Al-Ti-B master alloys are widely used in the aluminum industry as grain refiners for the control of the microstructure of the aluminum alloys. The SHS (self-propagating high-temperature synthesis) is an ex situ method that uses exothermic reactions to sustain the chemical reaction in a combustion wave. The advantages of SHS are the low energy requirement, simplicity and product purity. However, the raw material used has to be very pure, with a very small size leading to the necessity of a reactor with a protective gas to produce the reaction. The purpose of this investigation is to fabricate SHS master alloys with commercial standard raw materials, with lower purity and higher grain size without a reactor or protective gas in order to (1) decrease the price and (2) improve the productivity of master alloy manufacturing. The possibility of using cheap borated salts instead of expensive pure boron has been studied. Different compositions of aluminum master alloy have been developed. Bigger TiB2 grain size has been obtained when using bigger commercial raw materials. Larger titanium powder can produce an aluminum master alloy with a maximum of 30% of aluminum without reactor. In comparison, SHS reaction is much more difficult when using finer titanium powder. View Full-Text
Keywords: grain refiner; self-propagating high-temperature synthesis; aluminum; flux grain refiner; self-propagating high-temperature synthesis; aluminum; flux
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Vicario, I.; Poulon-Quintin, A.; Lagos, M.A.; Silvain, J.-F. Effect of Material and Process Atmosphere in the Preparation of Al-Ti-B Grain Refiner by SHS. Metals 2015, 5, 1387-1396.

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