Surface hardening of age-hardenable Cu-Ti dilute alloys by plasma nitriding

S. Semboshi, S. Kimura, A. Iwase, N. Ohtsu

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A plasma-nitriding procedure was applied to enhance the surface hardness and wear toughness of practical age-hardenable Cu-4mol% Ti alloy. Plasma nitriding at 1073K and 1173K leads to the formation of TiN surface layers with thicknesses of 300nm and 350nm, respectively, above Cu3Ti3O layers with thicknesses of approximately 700nm and 2200nm. In other words, the thicknesses of the surface compound layers increase with plasma nitriding temperature, which also increases the surface hardening. In particular, the hard TiN and Cu3Ti3O on the surface contribute to hardening of the surface to Vickers hardness of around 10GPa, which is much greater than the hardness of the substrate alloy of approximately 1.6GPa. The surface layers also modified the wear resistance significantly. Thus, an optimized plasma-nitriding procedure is a promising surface modification technique for age-hardenable Cu-Ti dilute alloys.

Original languageEnglish
Pages (from-to)691-698
Number of pages8
JournalSurface and Coatings Technology
Publication statusPublished - 2014 Nov 15


  • Cu-Ti alloy
  • Hardness
  • Nitriding
  • Surface hardening
  • TiN
  • Wear resistance

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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