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Microstructure Control of Nb-Si Alloy Doped with Zr and Mg through Eutectic and Eutectoid Reactions and its Deformation Behavior

Published online by Cambridge University Press:  26 February 2011

Seiji Miura ,
Yuki Murasato ,
Kenji Ohkubo ,
Yoshisato Kimura ,
Nobuaki Sekido ,
Yoshinao Mishima  and
Tetsuo Mohri
Seiji Miura
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan, 81-11-706-6347, 81-11-706-6347
Yuki Murasato
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan
Kenji Ohkubo
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan
Yoshisato Kimura
Affiliation:
[email protected], Tokyo Institute of Technology, Mat.Sci. and Eng, Yokohama, 4259, Japan
Nobuaki Sekido
Affiliation:
[email protected], University of Wisconsin-Madison, Mat.Sci. and Eng, Madison, WI, 53706, United States
Yoshinao Mishima
Affiliation:
[email protected], Tokyo Institute of Technology, Mat.Sci. and Eng, Yokohama, 4259, Japan
Tetsuo Mohri
Affiliation:
[email protected], Hokkaido Univ., Mat.Sci. and Eng., Kita-13, Nishi-8, Sapporo, 060-8628, Japan
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Abstract

In order to overcome the brittleness of Nb-Si intermetallic compounds, a novel microstructure control through a eutectic solidification and a eutectoid decomposition reactions has been proposed for obtaining Nb matrix alloys with Nb-silicide dispersion by the present authors. As the additions of Zr and Mg accelerate the eutectoid decomposition rate and spheroidization of Nb-silicide during heat treatment, the effects of these additives on the eutectic microstructure are investigated. The effect of the growth rate during the uni-directional solidification on the microstructure of a selected alloy was examined and it was found that the following eutectoid reaction rate is strongly affected by the growth rate.

Keywords

Nbcrystal growthphase equilibria
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-33
Copyright
Copyright © Materials Research Society 2007

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References

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