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Scandium on the formation of in situ TiB2 particulates in an aluminum matrix

Published online by Cambridge University Press:  28 June 2018

Dan Huang ,
David Yan ,
Siming Ma  and
Xiaoming Wang
Dan Huang
Affiliation:
School of Engineering Technology, Purdue University, West Lafayette, Indiana 47906, USA
David Yan
Affiliation:
Department of Aviation and Technology, San Jose State University, San Jose, California 95192, USA
Siming Ma
Affiliation:
School of Engineering Technology, Purdue University, West Lafayette, Indiana 47906, USA
Xiaoming Wang*
Affiliation:
School of Engineering Technology, Purdue University, West Lafayette, Indiana 47906, USA
*
a)Address all correspondence to this author. e-mail: wang1747@purdue.edu
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Abstract

TiB2 particulates were formed in situ in an aluminum matrix via chemical reactions between an aluminum melt and the mixture of K2TiF6 and KBF4 salts. Different effects of Sc addition on the formation of the TiB2 particulates were revealed depending on the participation of Sc at different stages of the formation of the particulates. The metal–salt reactions resulted in boride layers along the α-Al grain boundaries in the presence of Sc, while the addition of Sc after the metal–salt reactions broke up the boride layers improving the dispersion of the TiB2 particulates to a limited degree. Sc promoted the growth of the TiB2 particulates, resulting in the coarsening of TiB2 particulates. The participation of Sc in the formation of TiB2 particulates altered the coarsening of the TiB2 particulates, resulting in different morphologies of the TiB2 particulates depending on the participation of Sc in the formation of the TiB2 particulates at different stages.

Keywords

in situ TiB2aluminum alloyAl–Ti–Bmetal matrix compositeAl–Sc alloy
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 18 , 28 September 2018 , pp. 2721 - 2727
Copyright
Copyright © Materials Research Society 2018 

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