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Directional Solidification of Mo5Si3-MoSi2 Eutectic

Published online by Cambridge University Press:  10 February 2011

S. M. Borowicz,
L. Heatherly,
R. H. Zee and
E. P. George
S. M. Borowicz
Affiliation:
Materials Engineering Program, Auburn University, Auburn, AL 36849
L. Heatherly
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
R. H. Zee
Affiliation:
Materials Engineering Program, Auburn University, Auburn, AL 36849
E. P. George
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

The Mo-Si phase diagram exhibits a Mo5Si3-MoSi2 eutectic at the 54% Si composition. Since the terminal phases have comparable melting points and are equidistant from the eutectic composition, there is the possibility of obtaining lamellar microstructures in this system. In addition, if the alloys are directionally solidified, there is the further possibility of obtaining aligned lamellae. In this study, a high temperature (xenon-arc-lamp) optical floating zone furnace is utilized to directionally solidify Mo-Si alloys of the eutectic composition. Growth conditions are systematically varied to investigate their effects on the solidification microstructure. Growth rates and rotation speeds are identified that result in lamellar microstructures.

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References

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