Fabrication, tribological and corrosion behaviors of ultra-fine grained Co-28Cr-6Mo alloy for biomedical applications
Fabrication, tribological and corrosion behaviors of ultra-fine grained Co-28Cr-6Mo alloy for biomedical applications
复制标题
用于生物医学应用的超细晶粒 Co-28Cr-6Mo 合金的制造、摩擦学和腐蚀行为
DOI：
10.1016/j.jmbbm.2015.12.039
复制
发表时间：
2016
影响因子：
3.9
通讯作者：
Chu Kangjie
中科院分区：
文献类型：
--
作者：
Ren Fuzeng;Zhu Weiwei;Chu Kangjie
采用机械合金化和热压相结合的方法制备了不含镍和碳化物的Co-28Cr-6Mo合金。研究了其显微组织、力学性能、销盘干滑动磨损及在模拟生理溶液中的腐蚀行为。制备的Co-28Cr-6Mo合金具有ε-相超细晶拉长组织，平均晶粒尺寸为600 nm，厚度为150 nm。硬度和模量分别为8.87±0.56 GPa和198.27±7.02 GPa。与氧化铝干滑动摩擦系数与锻造Co-29Cr-6Mo合金相当接近。初始ε相和UFG组织有助于减少磨损过程中剧烈塑性变形区域的深度，使合金具有优异的耐磨性。这种UFG Co-Cr-Mo合金的腐蚀电位比ASTM合金具有更高的正腐蚀电位和更低的腐蚀电流密度。
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.