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In Vitro Study on Mg-Sn-Mn Alloy as Biodegradable Metals

Journal of Materials Science & Technology 2014年第7期30卷 675-685页

作者： Zhen Zhen Tingfei Xi Yufeng Zheng li li lugee li Center for Biomedical Materials and Tissue Engineering Academy for Advanced Interdisciplinary StudiesPeking University Biomedical Engineering Research Center Shenzhen InstitutePeking University Department of Materials Science and Engineering College of EngineeringPeking University Center for Biomedical Materials and Engineering Harbin Engineering University Dongguan EONTEC Company Ltd

The mechanical properties, chemical properties and biocompatibility of Mg-3Sn-0.5Mn alloy were tested. A series of in vitro evaluations such as tensile test, static and dynamic immersion test, hemocompatibility test as well as cytotoxicity test were presented, with commercial magnesium alloy WE43 as the control. Mg-3Sn-0.5Mn alloy possesses suitable strength and superior ductility compared with WE43 and AZ31. Static immersion and dynamic degradation tests showed more uniform degradation with a more moderate rate for Mg-3Sn-0.5Mn alloy （0.34 mm/y in static condition and 0.25 mm/y in dynamic condition） compared with WE43 alloy （0.42 mm/y in static condition and 0.33 mm/y in dynamic condition） in Hank＇s solution. Blood compatibility evaluation suggested that Mg-3Sn-0.5Mn alloy had no destructive effect on erythrocyte and showed excellent anti-thrombogenicity to blood system. Besides, Mg-3Sn-0.5Mn alloy showed no inhibition effect to L929 metabolic activity and mild toxicity to vascular smooth muscle cell （VSMC） in preliminary cell viability assessment. By considering its excellent mechanical strength, corrosion resistance, low ion release rate and good biocompatibility, Mg-3Sn-0.5Mn alloy may be a promising economical candidate as biomedical implant material for load-bearing clinical applications in the future.

关键词： Mg-3Sn-0.5Mn alloy Corrosion Dynamic immersion Static immersion Biodegradable material

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Mass production of magnetocaloric LaFeMnSiB alloys with hydrogenation

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Journal of Iron and Steel Research International 2017年第4期24卷 462-468页

作者： Tao Zhang Cheng-yong Wang lugee li Yong Zhang Cui-lan liu Guangdong University of Technology Guangzhou 510006GuangdongChina Dongguan Eontech Co. Ltd.Dongguan 523662GuangdongChina State Key Laboratory of Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Baotou Research Institute of Rare Earth Baotou 014030Inner MongoliaChina

LaFe_（11.39）Mn_（0.35）Si_（1.26）B_（0.1）Hxalloys were prepared by *** were annealed at 1343Kfor30-90 hto form the NaZn13 ***-rich andα-Fe secondary phases were also *** hydrogenation at 553 Kand 0.15 MPa of H_2 pressure for 5hwas employed to improve the Curie temperature of the alloys to 279 *** maximum magnetic entropy change,relative cooling power,and adiabatic temperature change of LaFe_（11.39）Mn_（0.35）Si_（1.26）B_（0.1）H_x annealed at 1343 Kfor 90hafter hydrogen absorption are 6.38J/（kg·K）（magnetic changesμ0ΔH =1.65T）,100.1J/kg（μ0ΔH =1.65T）,and 2.2 K（μ0ΔH =1.48T）,*** the maximum magnetic entropy change of the LaFe_（11.39）Mn_（0.35）Si_（1.26）B_（0.1）H_x alloys is lower than those of similar alloys with high purity raw materials,the relative cooling power is nearly the *** effect of impurities of the raw materials used was also *** is assumed that the impurity of 0.2wt.% Al is responsible for the reduced entropy change of the resulted *** LaFe_（11.39）Mn_（0.35）Si_（1.26）B_（0.1）H_x alloys prepared by this method could be a low cost alternative material for room temperature magnetic cooling applications.

关键词： Magnetocaloric effect Annealing Hydrogenation Adiabatic temperature change Relative cooling power Maximum magnetic entropy change

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Graded microstructures of Al-li-Mg-Zn-Cu entropic alloys under supergravity

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Science China Materials 2019年第5期62卷 736-744页

作者： Ruixuan li Zhe Wang Zhancheng Guo Peter K. liaw Tao Zhang lugee li Yong Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Department of Materials Science and Engineering The University of Tennessee Dongguan EON Institute for Advanced Materials

Investigating the microstructures and properties of gradient materials has been regarded as a promising way to accelerate the identification of optimal compositions for applications. Herein, a supergravity method is applied to prepare the graded entropic alloys Al-Zn-li-Mg-Cu. Through carefully optimizing the experimental conditions, the graded microstructures and hardness values appear after the supergravity technique. The morphology of the alloy significantly changes from the bulk intermetallics to eutectic structures along the supergravity force direction, which results from the crushed and graded aluminum oxide combined with the extremelystrong force. The results show that with this supergravity method, a performance-enhanced alloy can potentially be achieved through the centrifugation in a short time span and thus it paves the way for designing and synthesizing entropic alloys with intriguing properties.

关键词： entropic alloys supergravity graded microstructures grain refinement viscosity

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Degradation and biological properties of Ca-P contained micro-arc oxidation self-sealing coating on pure magnesium for bone fixation

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Regenerative Biomaterials 2015年第2期2卷 107-118页

作者： Weidan Wang Peng Wan Chen liu lili Tan Weirong li lugee li Ke Yang Institute of Metal Research Chinese Academy of Sciences72 Wenhua RoadShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China EONTEC Co. LtdDongguanGuangdong523662China

Poor corrosion resistance is one of the main disadvantages for biodegradable magnesium-based metals,especially applied for bone fixation,where there is a high demand of bio-mechanical strength and *** coating has been proved as an effective method to control the in vivo *** this study a Ca-P self-sealing micro-arc oxidation(MAO)coating was studied to verify its efficacy and biological properties by in vitro and in vivo *** was found that the MAO coating could effectively retard the degradation according to immersion and electrochemical tests as well as 3D reconstruction by X-ray tomography after *** MAO coating exhibited no toxicity and could stimulate the new bone ***,the Ca-P self-sealing MAO coating could be a potential candidate for application of biodegradable Mg-based implant in bone fixations.

关键词： pure magnesium degradation self-sealing micro-arc oxidation coating in vivo implantation

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