The effects of two kinds of heat treatments T4(solution treatment) and T6(aging treatment) on the corrosion behaviors of Mg-3Zn magnesium alloy were studied by electrochemical measurements and scanning electron micros...The effects of two kinds of heat treatments T4(solution treatment) and T6(aging treatment) on the corrosion behaviors of Mg-3Zn magnesium alloy were studied by electrochemical measurements and scanning electron microscopy(SEM) .It is found that zinc element enriches along grain boundaries to exhibit a network microstructure for both T4-and T6-treated alloy.For T6 treatment,larger MgZn particles form mainly on grain boundary and fine MgZn particles precipitate on matrix.Compared with cast alloy,T4 treatment could decrease the amounts of MgZn particles,and decrease the zinc content of zinc-rich net-segregation.Electrochemical measurements show that T4 treatment increases the corrosion resistance while T6 treatment decreases the corrosion resistance of Mn-3Zn alloy.展开更多
In this paper,biomedical porous Ti-Nb-Ta-Zr with 40%porosity and 166±21μm macro-pore size was successfully fabricated by space holder method.The microstructure,Vickers hardness,compressive and electrochemistry b...In this paper,biomedical porous Ti-Nb-Ta-Zr with 40%porosity and 166±21μm macro-pore size was successfully fabricated by space holder method.The microstructure,Vickers hardness,compressive and electrochemistry behavior were studied.It results that a few second phases exist inβmatrix of the porous Ti-Nb-Ta-Zr.Its Young's modulus is 0.8 GPa,close to 0.01-3 GPa for trabecular bone.The total recovery strain ratio and pseudoelastic strain ratio are 8.8%and 2.7%,respectively.It fails mainly by brittle cleavage with the fan-shaped and smooth cleaved facets.Although,local ductile fracture by a few dimples and a small amount of transcrystalline fracture with the cleavage of similarly oriented laths in a colony are observed on the fracture surface.The impedance spectrum of porous Ti-Nb-Ta-Zr has the characteristics of half capacitive arc resistance,showing good corrosion resistance in SBF solution.展开更多
基金Project(2007CB613705)supported by the National Basic Research Program of China
文摘The effects of two kinds of heat treatments T4(solution treatment) and T6(aging treatment) on the corrosion behaviors of Mg-3Zn magnesium alloy were studied by electrochemical measurements and scanning electron microscopy(SEM) .It is found that zinc element enriches along grain boundaries to exhibit a network microstructure for both T4-and T6-treated alloy.For T6 treatment,larger MgZn particles form mainly on grain boundary and fine MgZn particles precipitate on matrix.Compared with cast alloy,T4 treatment could decrease the amounts of MgZn particles,and decrease the zinc content of zinc-rich net-segregation.Electrochemical measurements show that T4 treatment increases the corrosion resistance while T6 treatment decreases the corrosion resistance of Mn-3Zn alloy.
基金supported by“1331”Innovation Team of Jinzhong University(jzxycxtd2019008)research project under Grant No.201801D221095 from Natural Science Foundation of Shanxi Province(CN).
文摘In this paper,biomedical porous Ti-Nb-Ta-Zr with 40%porosity and 166±21μm macro-pore size was successfully fabricated by space holder method.The microstructure,Vickers hardness,compressive and electrochemistry behavior were studied.It results that a few second phases exist inβmatrix of the porous Ti-Nb-Ta-Zr.Its Young's modulus is 0.8 GPa,close to 0.01-3 GPa for trabecular bone.The total recovery strain ratio and pseudoelastic strain ratio are 8.8%and 2.7%,respectively.It fails mainly by brittle cleavage with the fan-shaped and smooth cleaved facets.Although,local ductile fracture by a few dimples and a small amount of transcrystalline fracture with the cleavage of similarly oriented laths in a colony are observed on the fracture surface.The impedance spectrum of porous Ti-Nb-Ta-Zr has the characteristics of half capacitive arc resistance,showing good corrosion resistance in SBF solution.
