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Microstructure and Properties of Directionally Solidified NbSi2/ Nb5Si3 Composites

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Abstract:

NbSi2 is an attractive material for high temperature applications due to its high melting point, low density and good oxidation resistance. The high-temperature strength of NbSi2 is expected to be further improved by incorporation with Nb5Si3, which performs a high creep resistance and strength at high temperature due to its complex crystal structure. In this paper, directionally solidified NbSi2/ Nb5Si3 in-situ composites have been prepared using an optical floating zone method. Scanning Electron Microscopes (SEM) and X-ray diffraction (XRD) have been used to investigate the phase constitution and microstructure. The orientation relationship between Nb5Si3 and NbSi2 is investigated by transmission electron microscopy (TEM). High-temperature properties of alloys are tested by compression at the strain rate of 1×10-4/s at 1673K and 1773K. It was found that high temperature strength and phase constitution of directionally solidified alloys depended on the addition of Mo.

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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

733-736

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.733

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Online since:

January 2005

Authors:

Wei Li, Hai Bo Yang, Ai Dang Shan, Lan Ting Zhang, Jian Sheng Wu

Keywords:

Directionally Solidification, High Temperature Compression, NbSi2/ Nb5Si3 Composites, Orientation Relationship, Phase Transformation

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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