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

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外文摘要：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 dis-tribution 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 strength-ductility 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 mi-crostructural targets for fabrication and processing.

外文关键词：

Magnesium alloyGrain morphologyCorrosionMechanical propertiesMini-tubes

作者：

Xiang Wang、Chun Chen、Bozun Miao、Zilong Wang、Hua Huang、Shaokang Guan、Guangyin Yuan

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作者单位：

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

School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450002,China

基金：

National Natural science Foundation of ChinaNational Natural science Foundation of Chinascience and Technology Innovation Commission of Shenzhen MunicipalityNational Key Research and Development Program of ChinaNational Key Research and Development Program of China

项目编号：

5213010452273318JCYJ202208181028150332021YFC24007012020YFE020210

出版年：

2024

DOI：

10.1016/j.jmst.2023.10.013

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.183(16)