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

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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.

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ACKNOWLEDGMENT

This work was supported in part by a Grant-in-Aid for Scientific Research (B) (No. 26289263) from the Japan Society for the Promotion of Science (JSPS).

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Authors and Affiliations

  1. Department of Materials Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan

    Yuki Hamada, Naotaka Kuroyanagi, Yasuyuki Kaneno & Takayuki Takasugi

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  1. Yuki Hamada
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  2. Naotaka Kuroyanagi
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  3. Yasuyuki Kaneno
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  4. Takayuki Takasugi
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Correspondence to Takayuki Takasugi.

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Hamada, Y., Kuroyanagi, N., Kaneno, Y. et al. Microstructure and mechanical properties of dual two-phase Ni3Al–Ni3V intermetallic alloys charged with carbon. Journal of Materials Research 31, 1711–1722 (2016). https://doi.org/10.1557/jmr.2016.153

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