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On the precipitation of TiB2 in aluminum melts from the reaction with KBF4 and K2TiF6
Outokumpu Copper R and D, Västerås, Sweden.
Corrosion and Metals Research Institute, Stockholm, Sweden.ORCID iD: 0000-0002-0101-0062
2005 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 413-414, p. 527-532Article in journal (Refereed) Published
Abstract [en]

The divergent reaction between Al and the two salts K2TiF6 and KBF4 are used in the manufacturing of Al-Ti-B master alloys for grain refinement. It is also possible to use the same reaction to make aluminum based metal matrix composites. The formation sequence of TiB2 from the reaction with K2TiF6 and KBF4 is discussed in the view of the formation of a salt/metal emulsion and agglomeration. The highly exothermic reaction with K2TiF6 will aid the formation of an emulsion and Al3Ti form that in a subsequent step transforms into TiB2. It will also support high element transfer efficiency. The reaction with KBF4 causes less heat to evolve and the tendency towards formation of an emulsion and thus lower transfer efficiency resulting in a sluggish formation of AlB2. Simultaneous additions of K2TiF6 and KBF4 increase the transfer efficiency but will cause the formation of stringer defects in a layered structure. © 2005 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2005. Vol. 413-414, p. 527-532
Keywords [en]
Al, In situ reaction, K2TiF6, KBF4, Particulate composite, Addition reactions, Agglomeration, Aluminum, Emulsions, Liquid metals, Metallic matrix composites, Phase transitions, Potassium compounds, Precipitation (chemical), Structure (composition), Aluminum melts, Titanium boride, Titanium compounds, composite
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-16642DOI: 10.1016/j.msea.2005.09.054OAI: oai:DiVA.org:hj-16642DiVA, id: diva2:454623
Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2017-12-08Bibliographically approved

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Jarfors, A. E. W.

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