title: Effects of surface friction treatment on the in vitro release of constituent metals from the biomedical Co-29Cr-6Mo-0.16N alloy.
abstract: Due to the ignorance by many researchers on the influence of starting microstructure on the metal release of biomedical materials in human body after implant, in this study, the effect of surface friction treatment on the in vitro release of the constituent elements of the biomedical Co-29Cr-6Mo-0.16N (CCM) alloy is investigated for the first time by immersion test in lactic acid solution combined with electron backscatter diffraction, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, and inductively coupled plasma atomic emission spectroscopy (ICP-EOS). The results indicate that friction treatment on the as-annealed CCM alloy sample surface leads to a planar strain-induced martensitic transformation (SIMT) on sample surface; this greatly accelerates the release of all the constituent elements and, in particular, that of Co as indicated by the ICP-EOS analysis. This increase can be ascribed to a localized deformation that occurred over the entire sample surface, with the dislocation density being high within the SIMTed phase and low in the alloy matrix.
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Wang
authors.affiliation: State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, China; School of Materials Science and Engineering, Central South University, Changsha, China. Electronic address: lyping@csu.edu.cn.
authors.forename: Yunping
authors.initials: Y
authors.lastname: Li
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Yuhang
authors.initials: Y
authors.lastname: Hou
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Huakang
authors.initials: H
authors.lastname: Bian
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Koizumi
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Chiba
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D017276:Friction; D008982:Molybdenum / Q000737:chemistry*
chemical_list: D000497:Alloys; D002857:Chromium; D003035:Cobalt; D008982:Molybdenum
keywords: Acid solution; Cobalt; ICP-EOS; Metal release; XPS; surface friction treatment