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Plasma-Assisted Surface Modification of Two-Phase Intermetallic Alloy Composed of Ni3X Type Structures

Published online by Cambridge University Press:  01 February 2011

Yasuyuki Kaneno
Affiliation:
kaneno@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Sakai, Japan
Naoki Matsumoto
Affiliation:
am0505@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Sakai, Japan
Noriyoshi Tsuji
Affiliation:
tsuji@sdc-tanaka.co.jp, Tanaka Ltd., Osaka, Japan
Shinichi Tanaka
Affiliation:
shin-tnk@sdc-tanaka.co.jp, SDC Inc., Sakai, Japan
Takayuki Takasugi
Affiliation:
takasugi@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Sakai, Japan
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Abstract

A two-phase intermetallic alloy composed of Ni3Al (L12) and Ni3V (D022) was plasma-nitrided or -carburized in dependence of temperature and time. It was found that the hardness of the surface layer of the present intermetallic alloy was enhanced by both plasma-nitriding (PN) and -carburizing (PC), and primarily depended on treating temperature; the maximum surface hardness of the alloy was shown by nitriding at around 850 K and by carburizing at 1025 K. In addition, the hardened layers due to PN and PC effectively kept their hardness up to a high temperature. The XRD analysis revealed that vanadium nitride (VN) and vanadium carbide (VC) were formed in the surface of the nitrided and carburized alloy, respectively, suggesting that the enhanced surface hardness was attributed to the dispersion hardening due to the nitrides and carbides.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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References

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