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The microstructural engineering of Mo-Si-B alloys produced by reaction synthesis

  • Refractory Metals
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Abstract

Mo-Si-B alloys are candidate materials for next-generation jet engine turbine blades and have the potential to increase the service temperature of the base metals 200°C higher than nickel superalloys. These refractory alloys form a composite microstructure of molybdenum solid Solution (Moss and two intermetallic phases, Mo3Bi and Mo5SiB2, where the Moss phase enhances toughness and the intermetallic phases provide oxidation resistance. The properties of the alloys are highly dependent on the morphology of the microstructure. A powder processing approach has been developed to synthesize the three-phase alloys through the reaction of molybdenum, Si3N4 and BN powders. Electron backscatter diffraction imaging has been used to map the location of individual phases and provide a method for quantifying the Cluster size distribution of a secondary phase to examine the effect of BN reactant powders on the dispersion of the intermetallic phases.

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Authors and Affiliations

  1. Materials Science and Engineering Department, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA

    Michael R. Middlemas & Joe K. Cochran

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  1. Michael R. Middlemas
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  2. Joe K. Cochran
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Correspondence to Michael R. Middlemas.

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Middlemas, M.R., Cochran, J.K. The microstructural engineering of Mo-Si-B alloys produced by reaction synthesis. JOM 62, 20–24 (2010). https://doi.org/10.1007/s11837-010-0150-3

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  • DOI: https://doi.org/10.1007/s11837-010-0150-3

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