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Microstructure and Mechanical Properties of Multi-Phase Intermetallic Alloys Composed of GCP Ni3X (X:Si, Ti and Nb) Phases

Published online by Cambridge University Press:  26 February 2011

Masayoshi Fujita ,
Yasuyuki Kaneno  and
Takayuki Takasugi
Masayoshi Fujita
Affiliation:
hz502@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Materials Science, Graduate School of Engineering, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
Yasuyuki Kaneno
Affiliation:
kaneno@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Department of Materials Science, Graduate School of Engineering, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
Takayuki Takasugi
Affiliation:
takasugi@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Department of Materials Science, Graduate School of Engineering, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
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Abstract

Using alloys whose initial microstructures are composed of Ni3Si(L12), Ni3Si(L12)+Ni3Ti(D024) and Ni3Si(L12)+Ni3Nb(D0a), aging phenomenon and the associated high-temperature tensile property were investigated. It was shown by micro hardness measurement that age hardening behavior due to the precipitation of the Ni3Ti(D024) phase occurs in all alloys at temperatures above 823K. It was however shown by tensile test that the precipitated Ni3Ti(D024) phase is not so much effective in improving the mechanical properties of alloys whose initial microstructures are composed of Ni3Si(L12)+Ni3Nb(D0a) or Ni3Si(L12)+Ni3Ti (D024). In alloys whose initial microstructures are composed of Ni3Si(L12)+Ni3Nb (D0a), a good combination of tensile strength and tensile elongation was found over a wide of test temperature whether or not they contain the precipitated Ni3Ti(D024) phase.

Keywords

microstructureductilityNi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-32
Copyright
Copyright © Materials Research Society 2007

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References

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