Paper Title:
Microstructure and Properties of Directionally Solidified NbSi2/ Nb5Si3 Composites
  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.

  Info
Periodical
Materials Science Forum (Volumes 475-479)
Main Theme
Edited by
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Pages
733-736
DOI
10.4028/www.scientific.net/MSF.475-479.733
Citation
W. Li, H. B. Yang, A. D. Shan, L. T. Zhang, J. S. Wu, "Microstructure and Properties of Directionally Solidified NbSi2/ Nb5Si3 Composites", Materials Science Forum, Vols. 475-479, pp. 733-736, 2005
Online since
January 2005
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