Development of Machinable High-Strength Copper-Based Alloys by Sulfide Dispersion

Katsunari Oikawa, Hiroharu Ido, Hajime Mitsui, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Studies on the properties of Cu-S-Ti and Cu-S-Zr alloys containing 0.8-1.6 at% S, and 0.4-2.7 at% Ti or Zr were carried out. Titanium and zirconium formed (Ti, Cu)S and (Cu, Zr)2S, respectively, which were uniformly dispersed. Age-hardening phenomena were observed in the alloys having the composition ratio of Ti/S>1 or Zr/S>1, which indicates that the soluble titanium and zirconium in the Cu-matrix after formation of sulfide result in age-hardening. (Ti, Cu)S and (Cu, Zr)2S were found to be the effective inclusions for improving the machinability. The Cu-S-Ti and Cu-S-Zr alloys developed by sulfide dispersion are very promising as a new type of copper-based alloys having high strength, high electrical conductivity and good machinability.

Original languageEnglish
Pages (from-to)2088-2093
Number of pages6
JournalMaterials Transactions
Issue number10
Publication statusPublished - 2003 Oct


  • Electrical conductivity
  • High strength
  • Machinability
  • Titanium sulfide
  • Zirconium sulfide


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