Effect of Ni addition on the formation mechanism of Ti5Si3 during self-propagation high-temperature synthesis and mechanical property

Yang, Y. F. and Mu, D. (2014) Effect of Ni addition on the formation mechanism of Ti5Si3 during self-propagation high-temperature synthesis and mechanical property. Journal of the European Ceramic Society, 34 10: 2177-2185. doi:10.1016/j.jeurceramsoc.2014.02.018


Author Yang, Y. F.
Mu, D.
Title Effect of Ni addition on the formation mechanism of Ti5Si3 during self-propagation high-temperature synthesis and mechanical property
Formatted title
Effect of Ni addition on the formation mechanism of Ti5Si3 during self-propagation high-temperature synthesis and mechanical property
Journal name Journal of the European Ceramic Society   Check publisher's open access policy
ISSN 0955-2219
1873-619X
Publication date 2014-09-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.jeurceramsoc.2014.02.018
Volume 34
Issue 10
Start page 2177
End page 2185
Total pages 9
Place of publication London United Kingdom
Publisher Elsevier
Language eng
Formatted abstract
The addition of Ni to Ti-Si system significantly decreased the ignition difficulty of self-propagation high-temperature synthesis (SHS), increased the product purity and improved the mechanical properties of bulk Ti5Si3 material. The formation of Ti5Si3 was controlled by two mechanisms: (i) solid-state reaction: evolution of unstable Ti-Si intermediate phases to Ti5Si3 through the mutual diffusion of Ti and Si atoms; and (ii) Ni-induced dissolution-precipitation: Ni reacted with Si and Ti to form Ni-Si and Ni-Ti intermetallics and the heat released from these reactions created massive Ni-Si and Ni-Ti liquids; subsequently, these liquid diffused mutually to form Ni-Ti-Si ternary liquid and finally massive Ti5Si3 precipitated out of the liquid. The latter mechanism played a dominant role in forming Ti5Si3 and led to the direct formation of Ti5Si3, which decreased the product impurity. The good binder effect of Ni for Ti5Si3 contributed to the improved fracture toughness and enhanced density.
Keyword Powder metallurgy
Self-propagation high-temperature synthesis
Ceramic
Composite
Titanium silicides
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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