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Microstructures, mechanical properties and in vitro corrosion behavior of biodegradable Zn alloys microalloyed with Al, Mn, Cu, Ag and Li elements

引用

Journal of Materials Science & Technology 2022年第8期103卷 244-260页

作者： Lei Li Huanzheng Jiao Congfu Liu Lin Yang Yusong Suo Ruixue Zhang Tie Liu Jianzhong Cui Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

In this work,Zn microalloyed with Al,Mn,Cu,Ag and Li was cast,annealed and *** results showed that addition of multiple trace elements causes significant change in the microstructures,mechanical properties and corrosion behavior of Zn-0.1Al-0.1Mn-0.1Cu-0.1Ag(^(1)ZM),Zn-0.1Al-0.1Mn-0.1Cu0.1Ag-0.1Li(^(2)ZM-0.1Li)and Zn-0.1Al-0.1Mn-0.1Cu-0.1Ag-0.35Li(^(3)ZM-0.35Li)*** ternary phases with the approximate compositions of Al_(13)Mn_(3)Zn_(34) and Al_(10)MnZn_(89) phases are formed in the casting and annealing processes of these alloys,***β-LiZn_(4) lamellae that have not been extensively reported are precipitated from the primary Zn dendrites in the casting process of ZM-0.35Li ***,Zn laths are precipitated from the eutecticβ-LiZn_(4) phase in the annealing process of ZM-0.35Li *** above-mentioned phases are crushed or elongated in the as-extruded alloys,which play an important role in improving the strength of the *** the as-extruded alloys have typical(0001)basal texture,accompanied with relatively low{0001}slip and high{1012}twinning Schmid factors,which are advantageous and disadvantageous to the strength enhancement of the alloys,*** the as-cast alloys exhibit poor mechanical properties,especially low *** as-extruded ZM alloy exhibits ultrahigh ductility,with an elongation of up to 82.2%±2.94%.The as-extruded ZM0.35Li alloy shows the best comprehensive mechanical properties,with yield strength,ultimate tensile strength,elongation and hardness of 380±1.6 MPa,449±7.4 MPa,62.3%±4.63%and 98±1.4 HV,*** corrosion rates of the ZM,ZM-0.1Li and ZM-0.35Li alloys are 0.241±0.004,0.206±0.006 and 0.189±0.008 mm/year,*** vitro immersion corrosion rates(after 26 d in SBF solution)of them are 0.134±0.005,0.125±0.004 and 0.121±0.003 mm/year,*** as-extruded ZM-0.35Li alloy exhibits the best corrosion resistance.

关键词： Biodegradable Zn alloy multi-microalloying Microstructure Mechanical properties Corrosion behavior

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