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Formation of intermetallic nanocomposites in the Ti–Al–Si system by mechanical alloying and subsequent heat treatment

Published online by Cambridge University Press:  31 January 2011

K. W. Liu ,
J. S. Zhang ,
J. G. Wang  and
G. L. Chen
K. W. Liu
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
J. S. Zhang
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
J. G. Wang
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
G. L. Chen
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, 100083 Beijing, People's Republic of China
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Abstract

Formation of nanocrystalline Al3Ti, TiAl, Ti3Al, and Ti5Si3 composites by mechanically alloying (MA) in the Ti–Al–Si system and subsequent annealing treatment are investigated. Microstructure development was monitored by x-ray diffraction, differential thermal analysis, and transmission electron microscopy. An amorphous phase could be generated through milling for 100 h. The results of annealing at different temperatures on this amorphous phase show that the formation of titanium aluminides (Al3Ti, TiAl, and Ti3Al, according to the initial relative amount of Ti and Al) and Ti5Si3 (the only silicide produced by the crystallization reaction) take place. Annealing produces nanocrystalline composites of Al3Ti, TiAl, Ti3Al, and Ti5Si3 with a grain size less than 20 nm. With increasing annealing temperature, the crystalline sizes of the phases increased.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1198 - 1203
Copyright
Copyright © Materials Research Society 1998

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