Optimizaton of Mo-Si-B intermetallic alloys

Mo-Si-B intermetallics consisting of the phases Mo^sub 3^Si and Mo^sub 5^SiB^sub 2^, 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 w...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2005-03, Vol.36 (3), p.525-531
Main Authors: SCHNEIBEL, J. H, RITCHIE, R. O, KRUZIC, J. J, TORTORELLI, P. F
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Exact sciences and technology
Metallurgy
Metals
Metals. Metallurgy
Optimization
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Summary:Mo-Si-B intermetallics consisting of the phases Mo^sub 3^Si and Mo^sub 5^SiB^sub 2^, 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 MgAl^sub 2^O^sub 4^ spinel particles to Mo both hold promise in this regard. [PUBLICATION ABSTRACT]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-005-0166-4