Fabrication, tribological and corrosion behaviors of ultra-fine grained Co–28Cr–6Mo alloy for biomedical applications. (July 2016)

• Record Type: Journal Article
• Authors: Ren, Fuzeng; Zhu, Weiwei; Chu, Kangjie
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 60(2016)
• Page Start: 139
• Page End: 147
• Publication Date: 2016-07
• Subjects: Mechanical alloying -- Co–Cr–Mo alloy -- Wear -- Corrosion; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2015.12.039
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: Nickel and carbides free Co–28Cr–6Mo alloy was fabricated by combination of mechanical alloying and warm pressing. The microstructure, mechanical properties, pin-on-disk dry sliding wear and corrosion behavior in simulated physiological solution were investigated. The produced Co–28Cr–6Mo alloy has elongated ultra-fine grained (UFG) structure of ε-phase with average grain size of 600 nm in length and 150 nm in thickness. The hardness and modulus were determined to be 8.87±0.56 GPa and 198.27±7.02 GPa, respectively. The coefficient of friction upon dry sliding against alumina is pretty close to that of the forged Co–29Cr–6Mo alloy. The initial ε-phase and UFG microstructure contribute to reduce the depth of severe plastic deformation region during wear and enable the alloy with excellent wear resistance. The corrosion potential of such UFG Co–Cr–Mo alloy has more positive corrosion potential and much lower corrosion current density than those of ASTM alloy.