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Distinctive characteristics of solid-state reactions in mechanically alloyed Ti–Al–Si–C powder mixtures

Published online by Cambridge University Press:  03 March 2011

J.B. Zhou  and
K.P. Rao
J.B. Zhou
Affiliation:
Department of Manufacturing Engineering & Engineering Management,City University of Hong Kong, Kowloon, Hong Kong
K.P. Rao*
Affiliation:
Department of Manufacturing Engineering & Engineering Management,City University of Hong Kong, Kowloon, Hong Kong
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Ti–Al–Si–C powder mixtures of two different compositions, namely, 58Ti–30Al–6Si–6C (at.%) and 50Ti–15Al–20Si–15C (at.%), were mechanically alloyed to investigate the solid-state reactions during such a process. The mechanically alloyed powders were characterized as a function of milling time by x-ray diffraction (XRD), scanning electron microscopy, energy-dispersive spectrometry, and transmission electron microscopy (TEM). XRD results showed that solid solutions of Ti were formed for a powder mixture of 58Ti–30Al–6Si–6C in about 20 h of milling, whereas Ti5(Al,Si)3 and Ti(Al,Si)C compounds started to form in the powder mixture of 50Ti–15Al–20Si–15C within just 5 h of milling. TEM observations demonstrated that the particle sizes were of nano and submicron scale in both cases. This investigation indicated that in mechanically alloyed Ti–Al–Si–C powder mixtures, the main solid-state reactions are due to interdiffusion and mechanically induced self-propagating reaction.

Keywords

Mechanical alloyingPowder metallurgyStability
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 375 - 385
Copyright
Copyright © Materials Research Society 2005

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