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Mechanical properties, biodegradability and cytocompatibility of biodegradable mg-zn-zr-nd/Y alloys

Journal of Materials Science & Technology 2020年第12期47卷 190-201页

作者： Shi Jin Dan Zhang Xiaopeng Lu Yang Zhang Lili Tan Ying Liu Qiang Wang School and Hospital of Stomatology China Medical UniversityShenyang 110001China Liaoning Provincial Key Laboratory of Oral Diseases Shenyang 110001China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China School of Stomatology Jiamusi UniversityJiamusi 154007China

Biodegradable magnesium alloys have been turned out to be a promising candidate for orthopedic *** this study,the mechanical properties,degradation behaviorand cytocompatibility of mgzn-zr-nd and mg-zn-zr-Y alloys were studied in comparison with pure *** tests showed that the strength and ductility of mg-zn-zr-nd and mg-zn-zr-Y alloys were *** corrosion resistance analyzed by electrochemical test and immersion test in alpha modified eagle(α-MEM) medium with 10% fetal bovine serum(FBS) revealed the degradation of mg-zn-zr-nd and mg-zn-zr-Y alloys were faster than pure mg at an early stage but slowed down after long time *** metal ion concentrations were consistent with the corrosion ***-zn-zr-nd alloy shows better mechanical properties than pure mg and better corrosion resistance than mg-zn-zr-Y *** direct and indirect in vitro tests with MC3 T3-E1 cells demonstrate that mg-zn-zr-nd shows the best cytocompatibility and *** results suggest that mg-zn-zr-nd alloy shows an ideal combination of mechanical,corrosive and biological *** summary,these results implying the mg-zn-zr-nd alloy has great potential to benefit the future development of orthopedic applications.

关键词： Magnesium mg-zn-zr-nd alloy mg-zn-zr-Y alloy Biodegradable implant Biocompatibility

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Non-destructive corrosion study on a magnesium alloy with mechanical properties tailored for biodegradable cardiovascular stent applications

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Journal of Materials Science & Technology 2021年第7期66卷 128-138页

作者： Changhong Cai Marta M.Alves Renbo Song Yongjin Wang Jingyuan Li School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Centro de Qufmica Estrutural Instituto Superior TecnicoUniversidade de LisboaAv.Rovisco Pais1049-001LisboaPortugal

Anmg-2zn-0.6zr-0.6nd alloy for biodegradable cardiovascular stent applications was prepared through indirect extrusion. The alloy exhibited a superior combination of tensile yield strength(TYS), ultimate tensile strength(UTS) and elongation(EL) of about 269 MPa, 298 MPa and 25.6 %, respectively. In addition,the non-destructive electrochemical frequency modulation(EFM) technique was used for the first time to investigate the corrosion behavior of mg alloys combined with electrochemical impedance spectroscopy(EIS) in Dulbecco’s Modified Eagle’s Medium(DMEM) and in Hank’s solution. Compared with the corrosion rate of 0.07 mm/year in Hank’s solution, lower corrosion rate of 0.03 mm/year was achieved in DMEM. The significant differences between the corrosion rate trends were discussed and related with the composition of the corrosion layer formed. Depending on the biomimetic fluids tested, different corrosion products were precipitated on the alloy’s surface: a compact and homogeneous layer of mg_(x)Ca_(y)(PO_(4))_(z) and zn(OH)_(2) and organic compounds was formed in DMEM, whereas a partial coverage of mg_(x)Ca_(y)(PO_(4))_(z) and zn(OH)_(2) was formed in Hank’s solution.

关键词： mg-zn-zr-nd alloy Mechanical property Corrosion EIS EFM

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