The slow degration of iron limits its bone implant application.The solid solution of Zn in Fe is expected to accelerate the degradation.In this work,mechanical alloying(MA)was used to prepare Fe-Zn powder with supersa...The slow degration of iron limits its bone implant application.The solid solution of Zn in Fe is expected to accelerate the degradation.In this work,mechanical alloying(MA)was used to prepare Fe-Zn powder with supersaturated solid solution.MA significantly decreased the lamellar spacing between particles,thus reducing the diffusion distance of solution atoms.Moreover,it caused a number of crystalline defects,which further promoted the solution diffusion.Subsequently,the MA-processed powder was consolidated into Fe-Zn part by laser sintering,which involved a partial melting/rapid solidification mechanism and retained the original supersaturated solid solution.Results proved that the Fe-Zn alloy became more susceptible with a lowered corrosion potential,and thereby an accelerated corrosion rate of(0.112±0.013)mm/year.Furthermore,it also exhibited favorable cell behavior.This work highlighted the advantage of MA combined with laser sintering for the preparation of Fe-Zn implant with improved degradation performance.展开更多
The characteristics of morphologies and changes of the microstructures in mechanically alloyed （MA） （m（Cr）∶m（C）∶m（Cr）=90∶1∶9） mixed powders were investigated by using SEM observation and X-ray diffracti...The characteristics of morphologies and changes of the microstructures in mechanically alloyed （MA） （m（Cr）∶m（C）∶m（Cr）=90∶1∶9） mixed powders were investigated by using SEM observation and X-ray diffraction （XRD） analyses. The results show that Cu, C and Cr mixed powders mechanically alloyed for 12 h forms the Cu-based super-saturated solid solution; after high energy ball-milling for 96 h the partial solute elements Cr and C precipitate, meanwhile, the mechanochemical reactions take place and the carbides Cr7C3 form. The composite powders after mechanically alloyed are fine and flat. The formed defects such as free surface, grain boundary, sub-grain boundary and dislocation decrease diffusion activity energy, which is the important reason for developing super-saturated solid solution and promoting the second phase precipitation.展开更多
基金Projects(51935014,82072084,81871498)supported by the Natural Science Foundation of ChinaProjects(20192ACB20005,2020ACB214004)supported by the Jiangxi Provincial Natural Science Foundation of China+4 种基金Project(20201BBE51012)supported by the Provincial Key R&D Projects of Jiangxi Province,ChinaProject(2018)supported by the Guangdong Province Higher Vocational Colleges&Schools Pearl River Scholar Funded Scheme,ChinaProject(2017RS3008)supported by Hunan Provincial Science and Technology Plan,ChinaProject supported by the Open Research Fund of Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology,ChinaProject(2020M682114)China Postdoctoral Science Foundation。
文摘The slow degration of iron limits its bone implant application.The solid solution of Zn in Fe is expected to accelerate the degradation.In this work,mechanical alloying(MA)was used to prepare Fe-Zn powder with supersaturated solid solution.MA significantly decreased the lamellar spacing between particles,thus reducing the diffusion distance of solution atoms.Moreover,it caused a number of crystalline defects,which further promoted the solution diffusion.Subsequently,the MA-processed powder was consolidated into Fe-Zn part by laser sintering,which involved a partial melting/rapid solidification mechanism and retained the original supersaturated solid solution.Results proved that the Fe-Zn alloy became more susceptible with a lowered corrosion potential,and thereby an accelerated corrosion rate of(0.112±0.013)mm/year.Furthermore,it also exhibited favorable cell behavior.This work highlighted the advantage of MA combined with laser sintering for the preparation of Fe-Zn implant with improved degradation performance.
文摘The characteristics of morphologies and changes of the microstructures in mechanically alloyed （MA） （m（Cr）∶m（C）∶m（Cr）=90∶1∶9） mixed powders were investigated by using SEM observation and X-ray diffraction （XRD） analyses. The results show that Cu, C and Cr mixed powders mechanically alloyed for 12 h forms the Cu-based super-saturated solid solution; after high energy ball-milling for 96 h the partial solute elements Cr and C precipitate, meanwhile, the mechanochemical reactions take place and the carbides Cr7C3 form. The composite powders after mechanically alloyed are fine and flat. The formed defects such as free surface, grain boundary, sub-grain boundary and dislocation decrease diffusion activity energy, which is the important reason for developing super-saturated solid solution and promoting the second phase precipitation.
