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Effect of Growth Rate on Microstructure and Mechanical Properties of the Directionally Solidified Nb-Si Eutectic Alloy

Published online by Cambridge University Press:  11 February 2011

Nobuaki Sekido ,
Yoshisato Kimura  and
Yoshinao Mishima
Nobuaki Sekido
Affiliation:
Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226–8502, Japan Now with Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, U.S.A
Yoshisato Kimura
Affiliation:
Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226–8502, Japan
Yoshinao Mishima
Affiliation:
Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226–8502, Japan
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Abstract

The development of ultra-high temperature structural materials having superior mechanical properties to the nickel based superalloys has been pursued in the niobium silicide based composites. The unidirectional solidification technique was performed on the (Nb)/Nb3Si eutectic alloy in the Nb-Si binary system. A continuity of Nb phases in the eutectic microstructure increases with decreasing a growth rate, which yields the enhancement of fracture toughness as well as high temperature strength. The mechanisms of microstructural formation, toughening, and strengthening are briefly discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.25
Copyright
Copyright © Materials Research Society 2003

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