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Processing, microstructure, and mechanical properties of (Nb)/Nb5Si3 two-phase alloys

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Abstract

It has been shown that a fine lamellar structure composed of Nb solid solution, (Nb), and Nb5Si3 is formed through eutectoid decomposition in the Nb-Si binary system and its ternary derivatives. Such alloys would exhibit a high strength at over 1400 K, yet showing room-temperature toughness of over 10 to 20 MPa m1/2 if a proper lamellar spacing is chosen. In the present work, effects of processing on the microstructure evolution and mechanical properties are investigated on the Nb-18 at. pct Si alloys prepared by hot pressing (HP) and spark-plasma sintering (SPS). The powders used in the present work are of pure Nb and Nb5Si3 in order for the fabrication to become possible at temperatures higher than the melting point of Si and to reduce the formation of SiO2. The results show that the SPS yields more uniform two-phase microstructure but the alloy fabricated through HP tends to provide higher elevated temperature strength.

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Author notes

  1. Hiroaki Yamaoka (Graduate Student) & Nobuaki Sekido (Graduate Student)

    Present address: the Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 226-8502, Yokohama, Japan

Authors and Affiliations

  1. the Department of Materials Science and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 226-8502, Yokohama, Japan

    Yoshisato Kimura & Yoshinao Mishima

  2. the Petroleum Association of Japan, Chiyoda-ku, 100-0004, Tokyo, Japan

    Hiroaki Yamaoka (Graduate Student)

  3. the Department of Materials Science and Engineering, University of Wisconsin-Madison, 53706, Madison, WI

    Nobuaki Sekido (Graduate Student)

Authors
  1. Yoshisato Kimura
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  2. Yoshinao Mishima
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  3. Hiroaki Yamaoka
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  4. Nobuaki Sekido
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Additional information

This article is based on a presentation made in the symposium entitled “Beyond Nickel-Base Superalloys,” which took place March 14–18, 2004, at the TMS Spring meeting in Charlotte, NC, under the auspices of the SMD-Corrosion and Environmental Effects Committee, the SMD-High Temperature Alloys Committee, the SMD-Mechanical Behavior of Materials Committee, and the SMD-Refractory Metals Committee.

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Kimura, Y., Mishima, Y., Yamaoka, H. et al. Processing, microstructure, and mechanical properties of (Nb)/Nb5Si3 two-phase alloys. Metall Mater Trans A 36, 483–488 (2005). https://doi.org/10.1007/s11661-005-0161-9

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  • DOI: https://doi.org/10.1007/s11661-005-0161-9

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