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Optimization of Mo-Si-B Intermetallics

Published online by Cambridge University Press:  11 February 2011

Joachim H. Schneibel ,
Peter F. Tortorelli ,
Matthew J. Kramer ,
Andrew J. Thom ,
Jamie J. Kruzic  and
Robert O. Ritchie
Joachim H. Schneibel
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A
Peter F. Tortorelli
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A
Matthew J. Kramer
Affiliation:
Iowa State University, Ames Laboratory, Ames, Iowa 50011–3020, U.S.A.
Andrew J. Thom
Affiliation:
Iowa State University, Ames Laboratory, Ames, Iowa 50011–3020, U.S.A.
Jamie J. Kruzic
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory, and Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, U.S.A.
Robert O. Ritchie
Affiliation:
Materials Sciences Division, Lawrence Berkeley National Laboratory, and Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, U.S.A.
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Abstract

Mo-Si-B intermetallics consisting of the phases Mo3Si, Mo5SiB2, and α-Mo (Mo solid solution) can be designed to exhibit some degree of oxidation resistance, fracture toughness, and creep strength, but not necessarily all of these at the same time. For example, microstructures that enhance the oxidation resistance are typically associated with low fracture toughness. Examples will be given illustrating the oxidation resistance, fracture toughness, and creep strength of Mo-Si-B intermetallics as a function of their phase volume fractions as well as the topology and length scale of their microstructures. Microstructures containing either individual α-Mo particles or a continuous α-Mo matrix will be described. The examples provide possible ways to control the composition and microstructure of Mo-Si-B alloys such as to optimize the desired balance of properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB2.2
Copyright
Copyright © Materials Research Society 2003

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References

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