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Transition Metal Alloying and Phase Stability in the Mo-Si-B System

Published online by Cambridge University Press:  11 February 2011

R. Sakidja ,
S. Kim ,
J. S. Park  and
J. H. Perepezko
R. Sakidja
Affiliation:
University of Wisconsin-Madison, Materials Science & Engineering, 1509 University Avenue, Madison, WI 53706, USA
S. Kim
Affiliation:
University of Wisconsin-Madison, Materials Science & Engineering, 1509 University Avenue, Madison, WI 53706, USA
J. S. Park
Affiliation:
University of Wisconsin-Madison, Materials Science & Engineering, 1509 University Avenue, Madison, WI 53706, USA
J. H. Perepezko
Affiliation:
University of Wisconsin-Madison, Materials Science & Engineering, 1509 University Avenue, Madison, WI 53706, USA
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Abstract

The effect of transition metal substitution for Mo on the phase stability and multi-phase microstructures in the Mo-Si-B ternary system has been examined. The metal-rich portion of the ternary Mo-Si-B system at equilibrium is comprised of thermally stable BCC Mo(ss) phase, a ternary-based Mo5SiB2 (T2 phase), binary-based metal-rich silicides (Mo3Si [the A15 phase] and Mo5Si3 [the T1 phase]) and borides (Mo2B and MoB phases). Systematic alloying with selected transition metals which are substitutional in both Mo(ss) and T2 phases such as Cr, V, Nb, W, Ti and Hf, has been performed to elucidate the roles of the substitution on the stability of the three phase fields of Mo(ss) + T2 + A15 and T2+ T1 + A15. The potential of the alloying effects on the microstructure design and control of the solidification pathways is further detailed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB2.3
Copyright
Copyright © Materials Research Society 2003

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References

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