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- Title
The microstructural engineering of Mo-Si-B alloys produced by reaction synthesis.
- Authors
Middlemas, Michael; Cochran, Joe
- 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 (Mo and two intermetallic phases, MoBi and MoSiB, where the Mo 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, SiN 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.
- Subjects
MOLYBDENUM alloys; TURBINE blades -- Design &; construction; JET propulsion in airplanes; JET planes; MATERIALS testing; AIRPLANE design
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2010, Vol 62, Issue 10, p20
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-010-0150-3