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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.56  No.10 (2007)  >  pp.959-963

Journal of the Society of Materials Science, Japan
<<Previous article Vol.56  No.10 (2007)   pp.959 - 963 Next article>>

High Temperature Deformation Behavior and Microstructure Change in Nano-Grain Ti-SiC Composites

Naoki MIYANO1), Yusuke KUMAGAI2), Masayoshi YOSHIMOTO2), Kazuo ISONISHI3) and Kei AMEYAMA4)
1) Dept. of Micro Eng., Graduate School of Eng., Kyoto Univ.
2) Ritsumeikan Univ.
3) Dept. of Education, Shiga Univ.
4) Dept. of Sci. and Eng., Ritsumeikan Univ.


Ti-SiC nano grain composite is produced by sintering process by using mechanical alloyed powder. Then, its high temperature transformation behavior and the microstructure change of non-equilibrium structures are investigated. TiC/Ti5Si3 powders of elements Ti and SiC whose composition is Ti-20mass%SiC are blended for mechanical alloying (MA). The MA powder whose average particle size is 20∼30μm, has an amorphous structure. The MA powder is compacted by cold compact compression machine for fabrication of a compression-test piece. As the results of the compression-test and TEM observations, it found that new phases were forming during the compression test, and the flow stress changed depending on the initial microstructure of a test piece. Especially, the existence of Ti3SiC2 and a SiC phase affected deformation resistance. Such a deformation behavior is attributed to a pseudo-superplasticity in the material, in which the phase transition of metastable microstructure occurs during the deformation.


Keyword:
Mechanical alloying, Non-equilibrium, Ceramics composite, Superplastic deformation, SPS

Received: January 17, 2007
Published online: October 18, 2007
Copyright (c) 2007 by The Society of Materials Science, Japan

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