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Microstructure and mechanical properties of dual two-phase Ni3Al–Ni3V intermetallic alloys charged with carbon

Published online by Cambridge University Press:  19 April 2016

Yuki Hamada ,
Naotaka Kuroyanagi ,
Yasuyuki Kaneno  and
Takayuki Takasugi
Yuki Hamada
Affiliation:
Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
Naotaka Kuroyanagi
Affiliation:
Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
Yasuyuki Kaneno
Affiliation:
Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
Takayuki Takasugi*
Affiliation:
Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
*
a)Address all correspondence to this author. e-mail: takasugi@mtr.osakafu-u.ac.jp
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Abstract

The microstructures and mechanical properties of ternary (Ni75Al9V16) and multicomponent (Ni69Al9V9.5Nb3Ti1.5Co4Cr4) dual two-phase intermetallic alloys charged with C were investigated by scanning electron microscope, electron probe microscopic analyzer, x-ray diffraction, Vickers hardness, and tensile tests. Solid solubility limits of C in the dual two-phase microstructures were small, mostly less than 0.1 at.%. When C was charged exceeding the solid solubility limit, large-sized carbides were solidified with no structural coherency with the dual two-phase microstructure. Major transition metals constituting the carbides changed from Nb and Ti to V with increasing charged C content. This transition was correlated with the capability of the carbide formation. C dissolving in the dual two-phase microstructure enhanced hardness and flow strength through solid solution hardening without sacrificing tensile ductility. The formed carbides little contributed to strengthening, rather, contributed to softening through depleting constituent element V as well as alloying metals Nb, Ti, and Cr from the dual two-phase microstructures.

Keywords

Ni3AlNi3Vmultiphase intermetallicscarboncarbidemicrostructuremechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 12 , 28 June 2016 , pp. 1711 - 1722
Copyright
Copyright © Materials Research Society 2016 

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References

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