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Effect of Alloying Elements on Nb-Rich Portion of Nb-Si-X Ternary Systems and In Situ Crack Observation of Nb-Si-Based Alloys

  • Symposium: Beyond Nickel Base Superalloys II
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Abstract

To find a new route for microstructure control and to find additive elements beneficial for improving high-temperature strength, a systematic investigation is performed on hypoeutectic Nb-15 at. pct Si-X ternary alloys containing a transition element, Fe, Co, Ni, Cu, Ru, Rh, Pd, Re, Os, Ir, Pt, or Au. Information on phase equilibrium is classified in terms of phase stability of silicide phases, α Nb5Si3, Nb4SiX, and Nb3Si, and the relationship between microstructure and mechanical properties both at room temperature and high temperature is investigated. All the additive elements are found to stabilize either α Nb5Si3 or Nb4SiX but destabilize Nb3Si. A microstructure of Nbss/α Nb5Si3 alloy composed of spheroidized α Nb5Si3 phase embedded in the Nbss matrix is effective for toughening, regardless of the initial as-cast microstructure. Also the plastic deformation of Nbss dendrites may effectively suppress the propagation of longer cracks. High-temperature strength of alloys is governed by the deformation of Nbss phase and increases with higher melting point additives.

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Acknowledgments

This study is supported partly by The IWATANI NAOJI foundation. It is a pleasure for the authors to thank Mr. N. Miyazaki and Mr. H. Uesugi for technical support.

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Seiji Miura (Associate Professor) & Tetsuo Mohri (Professor)

  2. Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Toru Hatabata (Graduate Student) & Takuya Okawa (Graduate Student)

Authors
  1. Seiji Miura
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  2. Toru Hatabata
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  3. Takuya Okawa
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  4. Tetsuo Mohri
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Correspondence to Seiji Miura.

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Manuscript submitted December 31, 2012.

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Miura, S., Hatabata, T., Okawa, T. et al. Effect of Alloying Elements on Nb-Rich Portion of Nb-Si-X Ternary Systems and In Situ Crack Observation of Nb-Si-Based Alloys. Metall Mater Trans A 45, 1136–1147 (2014). https://doi.org/10.1007/s11661-013-2118-8

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  • DOI: https://doi.org/10.1007/s11661-013-2118-8

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