Mechanical and corrosion properties of biodegradable magnesium mini-tubes with different grain morphologies:Size and distribution  

作　　者：Xiang Wang Chun Chen Bozun Miao Zilong Wang Hua Huang Shaokang Guan Guangyin Yuan 

机构地区：[1]National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240 China [2]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450002,China

出　　处：《Journal of Materials Science & Technology》2024年第16期165-174,共10页材料科学技术（英文版）

基　　金：funded by grants from the National Natural Science Foundation of China(Nos.52130104 and 52273318);the Science and Technology Innovation Commission of Shenzhen Municipality(No.JCYJ20220818102815033);the National Key Research and Development Program of China(Nos.2021YFC2400701 and 2020YFE020210).

摘　　要：Biodegradable magnesium(Mg)alloys have received much attention due to their biocompatibility and biodegradation.In this study,to uncover the effects of grain morphologies,including grain size and distribution on mechanical and corrosion properties,biodegradable Mg-2.1Nd-0.2Zn-0.5Zr(wt.%)(denoted as JDBM)alloy mini-tubes for stent application with three typical microstructures were achieved success-fully by adjusting drawing parameters.Samples with the bimodal structure exhibit the highest strengthductility balance attributed to the combined effects of fine grains and coarse grains,but show the fastest corrosion rate of about 1.00±0.136 mm/year mainly due to the formation of micro galvanic couples between coarse and fined grains.Samples with fine equiaxed grains show the lowest corrosion rate of about 0.17±0.059 mm/year,as well as uniform corrosion mode and mechanical properties of yield strength(YS)256±5.7 MPa,ultimate tensile strength(UTS)266±3.8 MPa,and elongation to failure(EL)13.5%±1.8%,attributed to the high-density grain boundaries.Samples with coarse equiaxed grains exhibit medium corrosion resistance and mechanical properties of about 175±4.8 MPa,221±4.0 MPa,and 21.53%±4.1%.Considering the mechanical and in vitro corrosion properties,biodegradable JDBM alloy implants are recommended to be composed of fine equiaxed grains,which can be used as microstructural targets for fabrication and processing.

关 键 词：Magnesium alloy Grain morphology CORROSION Mechanical properties Mini-tubes 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG172.2[金属学及工艺—金属材料]