Development of multi-functional and high-strength copper--based alloys by sulfide dispersion

摘要

Studies on the properties of Cu-S-Ti and Cu-S-Zr alloys containing 0.8-1.6 at.% S, and 0.4-2.7at.% Ti or Zr were carried out. Titanium and zirconium formed the (Ti, Cu) S and (Cu, Zr) 2S, respectively, which were uniformly dispersed. The 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-fcc matrix after forming the sulfide result in the age-hardening. The (Ti, Cu) S and (Cu, Zr) 2S are 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 for the new type of copper-based alloys having the high strength, high electrical conductivity and good machinability.