title: Fabrication, tribological and corrosion behaviors of ultra-fine grained Co-28Cr-6Mo alloy for biomedical applications.
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 600nm in length and 150nm in thickness. The hardness and modulus were determined to be 8.87±0.56GPa and 198.27±7.02GPa, 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.
authors.affiliation: Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong, China. Electronic address: renfz@sustc.edu.cn.
authors.forename: Fuzeng
authors.initials: F
authors.lastname: Ren
authors.affiliation: Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Zhu
authors.affiliation: Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong, China.
authors.forename: Kangjie
authors.initials: K
authors.lastname: Chu
mesh_terms: D000497:Alloys; D000537:Aluminum Oxide; D001672:Biocompatible Materials; D002857:Chromium; D003035:Cobalt; D003343:Corrosion; D006244:Hardness; D008982:Molybdenum; D009532:Nickel
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D002857:Chromium; D003035:Cobalt; D009532:Nickel; D008982:Molybdenum; D000537:Aluminum Oxide
keywords: Corrosion; Co–Cr–Mo alloy; Mechanical alloying; Wear