The effect of 3 wt.% Cu addition on the microstructure, tribological property and corrosion resistance of CoCrW alloys fabricated by selective laser melting

J Mater Sci Mater Med. 2018 Mar 19;29(4):37. doi: 10.1007/s10856-018-6043-7.

Abstract

Microstructure, tribological property and corrosion resistance of orthopedic implant materials CoCrW-3 wt.% Cu fabricated by selective laser melting (SLM) process were systematically investigated with CoCrW as control. Equaxied γ-phase together with the inside {111} < 112 > type twin and platelet ε-phase was found in both the Cu-bearing and Cu-free alloys. Compared to the Cu-free alloy, the introduction of 3 wt.% Cu significantly increased the volume fraction of the ε-phase. In both alloys, the hardness of ε-phase zone was rather higher (~4 times) than that of γ-phase zone. The wear factor of 3 wt.% Cu-bearing alloy possessed smaller wear factor, although it had higher friction coefficient compared with Cu-free alloys. The ε-phase in the CoCr alloy would account for reducing both abrasive and fatigue wear. Moreover, the Cu-bearing alloy presented relatively higher corrosion potential Ecorr and lower corrosion current density Icorr compared to the Cu-free alloy. Accordingly, 3 wt.% Cu addition plays a key role in enhancing the wear resistance and corrosion resistance of CoCrW alloys, which indicates that the SLM CoCrW-3Cu alloy is a promising personalized alternative for traditional biomedical implant materials.

MeSH terms

  • Biocompatible Materials
  • Chromium Alloys*
  • Cobalt*
  • Copper*
  • Corrosion
  • Dental Materials
  • Lasers*
  • Materials Testing
  • Tungsten*

Substances

  • Biocompatible Materials
  • Chromium Alloys
  • Dental Materials
  • Cobalt
  • Copper
  • Tungsten