【摘 要】
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In this study,two casting speeds of 10 and 30 r/min were used in vertical twin-roll casting(TRC)to obtain Mg-rare earth(Mg-RE)alloys,and their microstructures,c
【机 构】
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Department of Electronic Engineering,Graduate School of Engineering,Saitama Institute of Technology,
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In this study,two casting speeds of 10 and 30 r/min were used in vertical twin-roll casting(TRC)to obtain Mg-rare earth(Mg-RE)alloys,and their microstructures,corrosion behaviours and in vivo bone reactions were investigated in detail.The results indicated that the roll-castings of TRC-30 r/min exhibited a finer grain size and higher volume fraction of non-crystallization than those in castings of TRC-10 r/min.Moreover,the results of electrochemical impedance spectroscopy(EIS)and po-tentiodynamic polarization indicated that the castings of TRC-30 r/min displayed a higher corrosion resistance compared with those in the castings of TRC-10 r/min.Animal tests showed that a higher degree of newly formed bone tissues was achieved by implants of TRC-30 r/min.Additionally,in vivo tests displayed that degradation properties of the TRC-30-r/min implants were better than those of the TRC-10-r/min implants;furthermore,the degradation layer was a two-layer structure,and P and Ca were enriched in the outer degradation layer.In summary,these findings elucidated that casting speed has a substantial effect on the microstructure and degradation property of Mg-based implants,and the degradation property performs better with increased casting speed.
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