首页|Impact of scandium and terbium on the mechanical properties,corrosion behavior,and biocompatibility of biodegradable Mg-Zn-Zr-Mn alloys
Impact of scandium and terbium on the mechanical properties,corrosion behavior,and biocompatibility of biodegradable Mg-Zn-Zr-Mn alloys
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维普
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Magnesium(Mg)-based bone implants degrade rapidly in the physiological environment of the human body which affects their structural in-tegrity and biocompatibility before adequate bone repair.Rare earth elements(REEs)have demonstrated their effectiveness in tailoring the corro-sion and mechanical behavior of Mg alloys.This study methodically investigated the impacts of scandium(Sc)and terbium(Tb)in tailoring the corrosion resistance,mechanical properties,and biocompatibility of Mg-0.5Zn-0.35Zr-0.15Mn(MZZM)alloys fabricated via casting and hot ex-trusion.Results indicate that addition of Sc and Tb improved the strength of MZZM alloys via grain size reduction and solid solution strengthe-ning mechanisms.The extruded MZZM-(1-2)Sc-(1-2)Tb(mass fraction)alloys exhibit compressive strengths within the range of 336-405 MPa,surpassing the minimum required strength of 200 MPa for bone implants by a significant margin.Potentiodynamic polarization tests re-vealed low corrosion rates of as-cast MZZM(0.25 mm·a-1),MZZM-2Tb(0.45 mm·a-1),MZZM-1Sc-1Tb(0.18 mm·a-1),and MZZM-1Sc-2Tb(0.64 mm·a-1),and extruded MZZM(0.17 mm·a-1),MZZM-1Sc(0.15 mm·a-1),MZZM-2Sc(0.45 mm·a-1),MZZM-1Tb(0.17 mm ·a-1),MZZM-2Tb(0.10 mm·a-1),MZZM-1Sc-1Tb(0.14 mm·a-1),MZZM-1Sc-2Tb(0.40 mm·a-1),and MZZM-2Sc-2Tb(0.51 mm· a-1)alloys,which were found lower compared to corrosion rate of high-purity Mg(about 1.0 mm·a-1)reported in the literature.Furthermore,addition of Sc,or Tb,or Sc and Tb to MZZM alloys did not adversely affect the viability of SaOS2 cells,but enhanced their initial cell attach-ment,proliferation,and spreading shown via polygonal shapes and filipodia.This study emphasizes the benefits of incorporating Sc and Tb ele-ments in MZZM alloys,as they effectively enhance corrosion resistance,mechanical properties,and biocompatibility simultaneously.
Corrosion propertyIn vitro cytotoxicityMagnesium alloysMechanical propertyRare earth elements
维普
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