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Effects of Solidification Parameters on Lamellar Microstructures of Near Eutectic Cr-Cr3Si Alloys

Published online by Cambridge University Press:  11 February 2011

H. Bei ,
E. P. George  and
G. M. Pharr
H. Bei
Affiliation:
The University of Tennessee, Department of Materials Science and Engineering, Knoxville, TN 37996–2200
E. P. George
Affiliation:
The University of Tennessee, Department of Materials Science and Engineering, Knoxville, TN 37996–2200 Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, TN 37831–6093
G. M. Pharr
Affiliation:
The University of Tennessee, Department of Materials Science and Engineering, Knoxville, TN 37996–2200 Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, TN 37831–6093
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Abstract

Directional solidification of Cr-Cr3Si eutectic alloys has been carried out using a high temperature optical floating zone furnace. Uniform and well-aligned lamellar structures were obtained over a fairly wide range of intermediate growth rates but not at very low or very high growth rates where degenerate and cellular structures, respectively, were obtained. The lamellar spacing was found to increase with decreasing solidification rate, in agreement with the Jackson-Hunt theory. In addition, for a fixed growth rate, the lamellar spacing was found to increase with increasing rotation rate. Lamellar structures could also be produced at off-eutectic compositions, but only for a limited range of growth conditions. The Cr-rich lamellae are effective in stopping indention cracks nucleated in the brittle Cr3Si phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB2.5
Copyright
Copyright © Materials Research Society 2003

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References

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