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Optimization of Mo-Si-B intermetallic alloys

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Abstract

Mo-Si-B intermetallics consisting of the phases Mo3Si and Mo5SiB2, and a molybdenum solid solution (“α-Mo”), have melting points on the order of 2000 °C. These alloys have potential as oxidation-resistant ultra-high-temperature structural materials. They can be designed with microstructures containing either individual α-Mo particles or a continuous α-Mo phase. A compilation of existing data shows that an increase in the volume fraction of the α-Mo phase increases the room-temperature fracture toughness at the expense of the oxidation resistance and the creep strength. If the α-Mo phase could be further ductilized, less α-Mo would be needed to achieve an adequate value of the fracture toughness, and the oxidation resistance would be improved. It is shown that microalloying of Mo-Si-B intermetallics with Zr and the addition of MgAl2O4 spinel particles to Mo both hold promise in this regard.

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Authors and Affiliations

  1. Oak Ridge National Laboratory, the Metals and Ceramics Division, 37831, Oak Ridge, TN

    J. H. Schneibel (Senior Research Staff Member) & P. F. Tortorelli (Group Leader)

  2. the Materials Sciences Division, Lawrence Berkeley National Laboratory, and Department of Materials Science and Engineering, University of California, 94720, Berkeley, CA

    R. O. Ritchie (Professor)

  3. the Department of Mechanical Engineering, Oregon State University, 97331-6001, Corvallis, OR

    J. J. Kruzic (Assistant Professor)

Authors
  1. J. H. Schneibel
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  2. P. F. Tortorelli
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  3. R. O. Ritchie
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  4. J. J. Kruzic
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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 15–17, 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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Schneibel, J.H., Tortorelli, P.F., Ritchie, R.O. et al. Optimization of Mo-Si-B intermetallic alloys. Metall Mater Trans A 36, 525–531 (2005). https://doi.org/10.1007/s11661-005-0166-4

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  • DOI: https://doi.org/10.1007/s11661-005-0166-4

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