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Microstructures and High-temperature Strength of Silicide-reinforced Nb Alloys

Published online by Cambridge University Press:  21 March 2011

C.L. Ma ,
Y. Tan ,
H. Tanaka ,
A. Kasama ,
R. Tanaka ,
Y. Mishima  and
S. Hanada
C.L. Ma
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube 755–0001, Japan
Y. Tan
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube 755–0001, Japan
H. Tanaka
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube 755–0001, Japan
A. Kasama
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube 755–0001, Japan
R. Tanaka
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube 755–0001, Japan
Y. Mishima
Affiliation:
Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226–8502, Japan
S. Hanada
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan
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Abstract

This article describes the phase stability, microstructures and mechanical properties of silicide-reinforced Nb alloys in Nb-Mo-W-Si quaternary system prepared by arc melting and heat treatment. There exists an equilibrium two-phase field of Nb solid solution (Nbss) and α(Nb,Mo,W)5Si3 in a Nb-rich region of this quaternary system. Alloys in this region have a eutectic reaction of L → Nbss+β(Nb,Mo,W)5Si3 during solidification. The β(Nb,Mo,W)5Si3 transforms to the stable α(Nb,Mo,W)5Si3 at very high temperature. The cast and heat treated hypoeutectic alloys consist of dendritic Nbss, network-shaped Nbss matrix and α(Nb,Mo,W)5Si3. These quaternary alloys exhibit excellent high-temperature strength, although the fracture toughness is still unacceptable for practical applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.39.1
Copyright
Copyright © Materials Research Society 2001

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References

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