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Microstructure and Mechanical Properties of Oxide Eutectic Fibers

Published online by Cambridge University Press:  21 February 2011

S. D. Durbin ,
A. Yoshikawa ,
K. Hasegawa ,
J.-H. Lee ,
B. M. Epelbaum ,
T. Fukuda  and
Y. Waku
S. D. Durbin
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
A. Yoshikawa
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
K. Hasegawa
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
J.-H. Lee
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
B. M. Epelbaum
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
T. Fukuda
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Y. Waku
Affiliation:
Japan Ultra-high Temperature Materials Research Center Ube 755-0001, Japan
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Abstract

Some oxide eutectic materials, such as sapphire/YAG, display an intricate “Chinese script” microstructure which strongly influences properties such as mechanical strength. We used the micro pulling-down technique to grow fibers of a series of such materials at rates over 20 mm/min, giving a uniform microstructure with a characteristic size as low as 150 nm. Bulk and surface characteristics of this microstructure were investigated by electron and atomic force microscopy. Smaller microstructure size gave higher tensile strength at 1500°C. Annealing of the fibers produced some coarsening of the microstructure, but increased the strength at lower temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 577
Copyright
Copyright © Materials Research Society 2000

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References

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