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Interfacial Microstructure of Titanium Nitride – Titanium Diboride Composite Synthesized by Hot Shock Compaction

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Abstract:

Interfacial microstructure of TiN-TiB2 composite, which was synthesized by hot shock compaction combined explosively shock condolidation and self-propagating high-temperature synthesis, was investigated by transmission electron microscopy (TEM). In the TiN-TiB2 composite included 60mol% TiN, an experimentally measured average grain size of the both TiN and TiB2 was approximately 500nm, and it decreased rather than those of the raw powders. By the conventional TEM observations, we clarified that there was a specific orientation relationship between cubic TiN and hexagonal TiB2. The high resolution electron microscopy (HREM) observations revealed that the TiN/TiB2 interphase boudnaries were atomically flat. We also observed grain boundaries of the composite and found that no secondary phases such as amorphous phase and precipitates were observed at the grain boundaries in the composite.

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Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

2481-2484

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.2481

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Online since:

October 2007

Authors:

Seiichiro Ii, Teruko Nishitani, Ryuichi Tomoshige

Keywords:

Composite, Grain Boundary, High Resolution Electron Microscopy (HREM), Hot Dynamic Compaction, Interphase Boundaries, TEM, Titanium Diboride, Titanium Nitride

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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