Processing and properties of Mo 5Si 3 single crystals and alloys

F. Chu, D. J. Thoma, K. J. McClellan, Pedro Peralta, F. X. Li, E. Fodran

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

Among the high-temperature intermetallic systems, transition-metal suicides are attractive because of their high melting temperatures (many greater than 2273 K) and potential oxidation resistance. In particular, Mo 3Si 3 exhibits a very high melting point (2453 K) and also has a solubility range of 2 - 3 atomic percent, which can aid in processing and alloy design strategies. The focus of this study is to evaluate the processing and properties of Mo 5Si 3 and Mo 3Si 3-base intermetallics. For the optimal baseline comparison, high-purity single crystals have been fabricated, and thermal and elastic properties have been experimentally measured. Although Mo 5Si 3 has a strong thermal expansion anisotropy, its elastic anisotropy factors and the Poisson's ratios indicate that Mo 5Si 3 is less anisotropic in elasticity. The combination of the thermal and elastic properties has been employed to calculate the thermal residual stress and to explain the potential for grain boundary cracking during processing. Room temperature Vickers indentation tests of Mo 5Si 3 have been performed. The orientation dependence of hardness and fracture toughness of Mo 5Si 3 single crystals have been obtained. The corresponding deformation and fracture modes have been revealed by microscopy studies. Finally, micro- and macroalloyed Mo 5Si 3 with aluminum and boron will be briefly explored with property assessments.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
Volume552
StatePublished - 1999
Externally publishedYes

Fingerprint

Single crystals
Intermetallics
Melting point
Anisotropy
Processing
Boron
Oxidation resistance
Poisson ratio
Aluminum
Indentation
Thermal stress
Transition metals
Thermal expansion
Fracture toughness
Elasticity
Residual stresses
Microscopic examination
Grain boundaries
Solubility
Hardness

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Chu, F., Thoma, D. J., McClellan, K. J., Peralta, P., Li, F. X., & Fodran, E. (1999). Processing and properties of Mo 5Si 3 single crystals and alloys In Materials Research Society Symposium - Proceedings (Vol. 552)

Processing and properties of Mo 5Si 3 single crystals and alloys . / Chu, F.; Thoma, D. J.; McClellan, K. J.; Peralta, Pedro; Li, F. X.; Fodran, E.

Materials Research Society Symposium - Proceedings. Vol. 552 1999.

Research output: Chapter in Book/Report/Conference proceedingChapter

Chu, F, Thoma, DJ, McClellan, KJ, Peralta, P, Li, FX & Fodran, E 1999, Processing and properties of Mo 5Si 3 single crystals and alloys in Materials Research Society Symposium - Proceedings. vol. 552.
Chu F, Thoma DJ, McClellan KJ, Peralta P, Li FX, Fodran E. Processing and properties of Mo 5Si 3 single crystals and alloys In Materials Research Society Symposium - Proceedings. Vol. 552. 1999
Chu, F. ; Thoma, D. J. ; McClellan, K. J. ; Peralta, Pedro ; Li, F. X. ; Fodran, E. / Processing and properties of Mo 5Si 3 single crystals and alloys Materials Research Society Symposium - Proceedings. Vol. 552 1999.
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