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

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.

• Authors: Jiasi Luo, Songquan Wu, Yanjin Lu, Sai Guo, Yang Yang, Chaoqian Zhao, Junjie Lin, Tingting Huang, Jinxin Lin
• Journal: Journal of materials science. Materials in medicine (J Mater Sci Mater Med) Vol. 29 Issue 4 Pg. 37 (Mar 19 2018) ISSN: 1573-4838 [Electronic] United States
• PMID: 29556818 (Publication Type: Journal Article)

Chemical References

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

Topics

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