Abstract
A dual two-phase intermetallic alloy composed of Ni 3Al (L1 2) and Ni 3V (D0 22) was plasma-nitrided (PN) or -carburized (PC) in dependence of processing temperature and time. The surface layers of nitrided or carburized alloy were characterized by micro-hardness measurement, scanning electron microscopy, electron probe micro-analysis and X-ray diffraction analysis. The maximum surface hardness of the alloy was obtained by nitriding at around 850 K and by carburizing at 1025 K, and little decreased up to a high temperature with increasing temperature. The XRD analysis revealed that vanadium nitrides (VN) and vanadium carbides (VC) were formed in the surface layer of the nitrided and carburized alloy, respectively; suggesting that the enhanced surface hardness is attributed to the dispersion hardening due to the nitrides and carbides.
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