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Ti-based solid solution carbonitrides prepared from Ti-alloy scraps via a hydrogenation-dehydrogenation process and high-energy milling

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Abstract

Ti-based solid-solution carbonitrides (Ti,Al,V)(CN) and (Ti,Al,Mo,V)(CN), were synthesized successfully using Ti-6Al-4V (Ti-64) and Ti-8Al-1Mo-1V (Ti-811) alloy scraps via hydrogenation-dehydrogenation and highenergy milling processes. A single phase of (Ti,Al,V)(CN) could be readily synthesized by the high-energy milling of Ti-64 alloy with graphite in a nitrogen atmosphere regardless of the carbon content. On the other hand, for the Ti-811 alloy, metallic Mo and various Mo-less carbides, in this case Ti2AlC, Ti3AlC2, and Ti3AlC, were also formed in addition to (Ti,Al,Mo,V)(CN) due to the low nitrogen affinity of Mo. The solid-solution carbonitrides consolidated by spark plasma sintering revealed excellent mechanical properties (HV: 19.1-20.6 GPa, KIC: 5.2-6.4 MPa·m1/2) due to the alloying effect of Al, Mo, and V in Ti(CN). These values are superior to those of typical Ti(CN)–based ceramic composites (HV: 16-20 GPa, KIC: 3.2-5.5 MPa·m1/2). We believe that the suggested method would be a valuable option for the production of Ti-based solid-solution carbonitrides with decent mechanical properties economically.

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Authors and Affiliations

  1. Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, Yuseong-gu, Daejeon, 305-350, Korea

    Sun-A Jung, Hanjung Kwon, Ki-Min Roh, Chang-Yul Suh & Wonbaek Kim

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  1. Sun-A Jung
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  2. Hanjung Kwon
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  3. Ki-Min Roh
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  4. Chang-Yul Suh
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  5. Wonbaek Kim
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Correspondence to Hanjung Kwon.

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Jung, SA., Kwon, H., Roh, KM. et al. Ti-based solid solution carbonitrides prepared from Ti-alloy scraps via a hydrogenation-dehydrogenation process and high-energy milling. Met. Mater. Int. 21, 923–928 (2015). https://doi.org/10.1007/s12540-015-5050-1

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