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Microstructures and High-temperature Strength of Silicide-reinforced Nb Alloys

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Abstract

This article describes the phase stability, microstructures and mechanical properties of silicide-reinforced Nb alloys in Nb-Mo-W-Si quaternary system prepared by arc melting and heat treatment. There exists an equilibrium two-phase field of Nb solid solution (Nbss) and α(Nb,Mo,W)5Si3 in a Nb-rich region of this quaternary system. Alloys in this region have a eutectic reaction of L → Nbss+β(Nb,Mo,W)5Si3 during solidification. The β(Nb,Mo,W)5Si3 transforms to the stable α(Nb,Mo,W)5Si3 at very high temperature. The cast and heat treated hypoeutectic alloys consist of dendritic Nbss, network-shaped Nbss matrix and α(Nb,Mo,W)5Si3. These quaternary alloys exhibit excellent high-temperature strength, although the fracture toughness is still unacceptable for practical applications.

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Acknowledgment

This research is supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan.

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Authors and Affiliations

  1. Japan Ultra-high Temperature Materials Research Institute, Ube, 755–0001, Japan

    C.L. Ma, Y. Tan, H. Tanaka, A. Kasama, R. Tanaka, Y. Mishima & S. Hanada

  2. Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, 226–8502, Japan

    Y. Mishima

  3. Institute for Materials Research, Tohoku University, Sendai, 980–8577, Japan

    S. Hanada

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  1. C.L. Ma
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  2. Y. Tan
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  3. H. Tanaka
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  4. A. Kasama
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  5. R. Tanaka
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  6. Y. Mishima
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  7. S. Hanada
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Ma, C., Tan, Y., Tanaka, H. et al. Microstructures and High-temperature Strength of Silicide-reinforced Nb Alloys. MRS Online Proceedings Library 646, 395–400 (2000). https://doi.org/10.1557/PROC-646-N5.39.1

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  • DOI: https://doi.org/10.1557/PROC-646-N5.39.1

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