The influence of alloying dysprosium(Dy)element on the biodegradable behavior and mechanical prop-erty of Mg-6 Zn alloys in a simulated body solution(SBF)solution was studied.The results indicate that Dy significantly...The influence of alloying dysprosium(Dy)element on the biodegradable behavior and mechanical prop-erty of Mg-6 Zn alloys in a simulated body solution(SBF)solution was studied.The results indicate that Dy significantly contributes to grain refinement,and form a distinctive fiber texture in Dy-containing al-loys.The presence of Dy promotes the formation of granular DyZn3 precipitates,which possess a higher electrode potential than the matrix,thus accelerating matrix corrosion.Corrosion results demonstrate that the Dy element is not beneficial to reducing the initial corrosion rate of Mg-6 Zn but is conducive to improving the protective effect of product film as the immersion time increases.Dy-containing alloys exhibit higher strength than Mg-6 Zn while maintaining good plasticity related to grain boundary and precipitation strength effects.Consequently,the incorporation of 2 wt.%Dy into Mg-6 Zn alloys results in a synergistic enhancement of strength,as well as moderate corrosion resistance and fracture elongation.展开更多
Mg alloys have broad application potential thanks to their low density,degradability,and biocompatibility.However,the inherent conflict between corrosion resistance and mechanical properties poses a significant challe...Mg alloys have broad application potential thanks to their low density,degradability,and biocompatibility.However,the inherent conflict between corrosion resistance and mechanical properties poses a significant challenge that restricts the application of Mg alloys as biomaterials.This study investigated the incorporation of Sm(0 wt%,2 wt%,4 wt%,6 wt%)into the Mg-7Gd-0.5Zr-0.5Zn alloy to enhance its mechanical properties and corrosion resistance.The findings suggest that incorporating the Sm element improves the tensile yield strength(TYS),ultimate tensile strength(UTS)and corrosion resistance despite the sacrifice of elongation.The Mg-7Gd-2Sm-0.5Zr-0.5Zn alloy presents an outstanding balance of corrosion resistance and mechanical properties.The TYS,UTS,and fracture elongation(FE)are175 MPa,265.8 MPa,and 19%,respectively.The corrosion rate is significantly reduced from 4.02 to 2.55 mm/y.With the increment of Sm content,the grains are refined,and the texture is weakened.Sm ele ment is beneficial to the promotion of the precipitation of second phases,forming Sm-containing(Mg,Zn)_(3)RE phase and MgsRE phase.Meanwhile,Sm promotes the co-segregation of elements at grain boundaries and stacking faults,which collectively influence the performance.The impacts of elements co-segregation and second phase on strengthening mechanisms and corrosion mechanisms are discussed in detail.展开更多
基金supported by the National Natural Science Foundation of China(No.52301133)the China Postdoctoral Science Foundation(No.2023M730276)the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(No.YESS20210415).
文摘The influence of alloying dysprosium(Dy)element on the biodegradable behavior and mechanical prop-erty of Mg-6 Zn alloys in a simulated body solution(SBF)solution was studied.The results indicate that Dy significantly contributes to grain refinement,and form a distinctive fiber texture in Dy-containing al-loys.The presence of Dy promotes the formation of granular DyZn3 precipitates,which possess a higher electrode potential than the matrix,thus accelerating matrix corrosion.Corrosion results demonstrate that the Dy element is not beneficial to reducing the initial corrosion rate of Mg-6 Zn but is conducive to improving the protective effect of product film as the immersion time increases.Dy-containing alloys exhibit higher strength than Mg-6 Zn while maintaining good plasticity related to grain boundary and precipitation strength effects.Consequently,the incorporation of 2 wt.%Dy into Mg-6 Zn alloys results in a synergistic enhancement of strength,as well as moderate corrosion resistance and fracture elongation.
基金Project supported by the National Natural Science Foundation of China(52301133,52471117)the China Postdoctoral Science Foundation(2023M730276)the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(YESS20210415)。
文摘Mg alloys have broad application potential thanks to their low density,degradability,and biocompatibility.However,the inherent conflict between corrosion resistance and mechanical properties poses a significant challenge that restricts the application of Mg alloys as biomaterials.This study investigated the incorporation of Sm(0 wt%,2 wt%,4 wt%,6 wt%)into the Mg-7Gd-0.5Zr-0.5Zn alloy to enhance its mechanical properties and corrosion resistance.The findings suggest that incorporating the Sm element improves the tensile yield strength(TYS),ultimate tensile strength(UTS)and corrosion resistance despite the sacrifice of elongation.The Mg-7Gd-2Sm-0.5Zr-0.5Zn alloy presents an outstanding balance of corrosion resistance and mechanical properties.The TYS,UTS,and fracture elongation(FE)are175 MPa,265.8 MPa,and 19%,respectively.The corrosion rate is significantly reduced from 4.02 to 2.55 mm/y.With the increment of Sm content,the grains are refined,and the texture is weakened.Sm ele ment is beneficial to the promotion of the precipitation of second phases,forming Sm-containing(Mg,Zn)_(3)RE phase and MgsRE phase.Meanwhile,Sm promotes the co-segregation of elements at grain boundaries and stacking faults,which collectively influence the performance.The impacts of elements co-segregation and second phase on strengthening mechanisms and corrosion mechanisms are discussed in detail.
