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Journal of Magnesium and Alloys 2024年第3期12卷 1102-1116页

作者： Yachen Hou Xueqi Zhang Jingan Li Liguo Wang shaokang guan School of Materials Science and Engineering and Henan Key Laboratory of Advanced Magnesium Alloy and Key Laboratory of Materials Processing and Mold Technology(Ministry of Education) Zhengzhou UniversityZhengzhou 450001China

The cardiovascular diseases(CVD)continue to be the major threat to global public health over the years,while one of the effective methods to treat CVD is stent *** magnesium(Mg)alloys have great potential applications in cardiovascular stents benefit from their excellent biodegradability and ***,excessive degradation rate and the delayed surface endothelialization still limit their further *** this study,we modified a Mg-Zn-Y-Nd alloy(ZE21B)by preparing MgF_(2) as the corrosion resistance layer,the dopamine polymer film(PDA)as the bonding layer,and hyaluronic acid(HA)loaded astaxanthin(ASTA)as an important layer to directing the cardiovascular cells *** electrochemical test results showed that the MgF_(2)/PDA/HA-ASTA coating improved the corrosion resistance of *** cytocompatibility experiments also demonstrated that this novel composite coating also selectively promoted endothelial cells proliferation,inhibited hyperproliferation of smooth muscle cells and adhesion of *** with the HAloaded rapamycin(RAPA)coating,our MgF_(2)/PDA/HA-ASTA coating showed better blood compatibility and cytocompatibility,indicating stronger multi-functions for the ZE21B alloy on cardiovascular application.

关键词： Biodegradable ZE21B alloy Reendothelialization Surface modification Hyaluronic acid Astaxanthin.

Exploring a balance between strength and ductility of hexagonal BN nanoplatelet reinforced ZK61 magnesium composite

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Journal of Magnesium and Alloys 2024年第5期12卷 1899-1910页

作者： Kewei Zhang Xiaolong Lu Yufeng Sun shaokang guan Yao Chen School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Key Laboratory of Advanced Magnesium Alloys in Henan Province Zhengzhou UniversityZhengzhou 450002China Key Laboratory of Advanced Materials Processing&Mold Ministry of EducationZhengzhou 450002China School of Mechanical and Electrical Engineering Soochow UniversitySuzhou 215021China

The practical applications of magnesium(Mg)alloys are usually beset by their relatively low strength and limited *** we attempt to fabricate hexagonal BN nanoplatelet(BNNP)reinforced ZK61 magnesium composites using a combination of spark plasma sintering and friction stir *** resulting composites exhibit microstructural characteristics of homogeneous dispersion of BNNP in Mg matrix with refined equiaxed grains and(0002)basal texture roughly surrounding the pin column *** electron microscopy observation illustrates that trace amounts of Mg_(3)N_(2)and MgB_(2)form at BNNP-Mg interface,in which Mg_(3)N_(2)locates at the basal plane of a BNNP and MgB_(2)grows at its open *** spatial distribution of Mg_(3)N_(2)and MgB_(2)facilitates interfacial wetting and stronger BNNP-Mg interface in such a way that interfacial products act as anchors bonding between *** comparison with monolithic ZK61 alloy,the BNNP/ZK61 composites display simultaneous improvements in yield strength,hardness and ductility,achieving good strength-ductility *** research is expected to shed some light on BNNP potentials for designing and producing magnesium composites with high strength and good ductility.

关键词： BN nanoplatelet Magnesium composite Strength Ductility Spark plasma sintering Friction stir processing

Effect of Ca Micro-Alloying on the Microstructure and Anti-Corrosion Property of Mg0.5Zn0.2Ge Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1147-1160页

作者： Bishan Cheng Depeng Li Baikang Xing Ruiqing Hou Pingli Jiang Shijie Zhu shaokang guan School of Materials Science and Engineering and Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou UniversityZhengzhou450001China Center of Advanced Analysis and Gene Sequencing Zhengzhou UniversityZhengzhou450001China Key Laboratory of Materials Processing and Mold Technology Ministry of EducationZhengzhou450002China

Magnesium and its alloys have attracting rising attention as one of biodegradable metallic ***,the rapid corrosion and severe localized corrosion still hinder their extensive applications in *** this study,micro-alloying of Ca(≤0.1 wt%)into Mg0.5Zn0.2Ge alloy developed in our previous work was explored to further enhance the corrosion resistance and alleviate the localized corrosion of the *** results reveal that the addition of Ca leads to the transformation of the cathodic Mg_(2)Ge phase in Mg0.5Zn0.2Ca alloy into anodic MgCaGe phase in Ca-containing alloys,thereby changing the galvanic couples in alloys during *** preferential dissolution of MgCaGe phase promotes the participation of Ca and Ge into the formation of corrosion products,resulting in the enrichment of Ca and Ge in the outmost of corrosion product layer,which stabilizes and passivates the corrosion product layer on Mg alloy ***,the enrichment of Zn at the corrosion interface seems to further hinder the corrosion of Mg *** of these factors confer a slower and more uniform corrosion on Mg0.5Zn0.2GexCa(x<0.1 wt%)alloy,which provides favorable candidates for the further processing to gain suitable biodegradable Mg alloys.

关键词： Magnesium alloy Micro-alloying Calcium Corrosion resistance

The deteriorated degradation resistance of Mg alloy microtubes for vascular stent under the coupling effect of radial compressive stress and dynamic medium

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Journal of Magnesium and Alloys 2024年第2期12卷 573-585页

作者： Mengyao Liu Yabo Zhang Qingyuan Zhang Yan Wang Di Mei Yufeng Sun Liguo Wang Shijie Zhu shaokang guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou 450002China Key Laboratory of Advanced Materials Processing&Mold Ministry of Education Zhengzhou 450002China

The degradation of Mg alloys relates to the service performance of Mg alloy biodegradable *** order to investigate the degradation behavior of Mg alloys as vascular stent materials in the near service environment,the hot-extruded fine-grained Mg-Zn-Y-Nd alloy microtubes,which are employed to manufacture vascular stents,were tested under radial compressive stress in the dynamic Hanks'Balanced Salt Solution(HBSS).The results revealed that the high flow rate accelerates the degradation of Mg alloy microtubes and its degradation is sensitive to radial compressive *** results contribute to understanding the service performance of Mg alloys as vascular stent materials.

关键词： Mg alloy Microtubes Degradation behavior Radial compressive stress Dynamic conditions

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钢结硬质合金与钢连接技术的研究现状

焊接学报 2024年第5期45卷 119-128页

作者：魏炜黄智泉张海燕徐莹吴淑菲关绍康郑州大学材料科学与工程学院郑州450001 郑州机械研究所有限公司郑州450001

钢结硬质合金具有合金钢的优良力学性能和硬质合金的高耐磨性、高硬度的特点,具有良好的性价比,如何将钢结硬质合金与大型耐磨部件金属基体形成牢固的冶金结合,已成为提高设备整体耐磨性和使用寿命的技术关键,通过总结钢结硬质合金与钢... 详细信息

钢结硬质合金具有合金钢的优良力学性能和硬质合金的高耐磨性、高硬度的特点,具有良好的性价比,如何将钢结硬质合金与大型耐磨部件金属基体形成牢固的冶金结合,已成为提高设备整体耐磨性和使用寿命的技术关键,通过总结钢结硬质合金与钢的不同冶金结合形式、原理和特点,并概述了近年来国内外学者在此领域所取得的研究成果,具体介绍了镶铸、钎焊、扩散焊、激光焊、电弧焊等连接方法的研究现状,重点总结了这些连接方法的适用范围以及在使用过程中存在的问题,特别是钢结硬质合金与钢基体的界面结合情况进行了统计分析,最后,通过对现有技术的归纳总结,展望了未来实现钢结硬质合金与钢基体良好冶金结合的研究和发展方向.

关键词：钢结硬质合金异质材料材料连接焊接方法

Rapid-developing Mg-based biodegradable materials:The editorial of the special issue on Mg-based functional materials-biomaterials section

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Journal of Magnesium and Alloys 2021年第6期9卷 2226-2228页

作者： Di Mei shaokang guan School of Materials Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloy Zhengzhou UniversityZhengzhou 450001HenanChina

Since physician Edward *** firstly tried to stop bleeding blood vessels with Mg wires in 1878[1],the history of Mg and its alloys as biomaterials has gone through more than 140 ***,in the latest 20 years,scientists from all over the world have carried out all-around research on Mg-based materials for the applications of vascular stents.

关键词： biomaterials bleeding alloys

Microstructure, mechanical properties and deformation mechanisms of an as-cast Mg–Zn–Y–Nd–Zr alloy for stent applications

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Journal of Materials Science & Technology 2019年第7期35卷 1211-1217页

作者： Jianfeng Wang Hongbo Zhou Liguo Wang Shijie Zhu shaokang guan School of Materials Science and Engineering Zhengzhou University

A new Mg-2Zn-0.2Y -0.5N d-0.4Zr (wt%) alloy designed specially for stent applications has been developed. The as-cast alloy is featured with equiaxed grains with a mean size of about 40 μm and a small am ount of second phase (T phase) distributed discontinuously either at the grain boundaries or inside the grains. This alloy exhibits a tensile elongation of up to 35%, which is much larger than that of most reported other as-cast Mg alloys. The tensile deform ation mechanisms have also been investigated. The results show that, besides basal slip,{10-12} extension twining and non-basal pyramidal slips can also be observed at initial stage and later stage during tensile deform ation, respectively, which are responsible for the good room -tem perature ductility.

关键词： Magnesium alloys Vascular stents Microstructure Mechanical properties Deformation mechanisms

The therapeutic potential of MSC-EVs as a bioactive material for wound healing

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Engineered Regeneration 2021年第1期2卷 182-194页

作者： Yachen Hou Jingan Li shaokang guan Frank Witte School of Material Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloy&Key Laboratory of materials processing and mold technology(Ministry of Education) Zhengzhou University100 Science RoadZhengzhou 450001PR China Department of Prosthodontics Geriatric Dentistry and Craniomandibular DisordersCharite–Universitatsmedizin BerlinAssmannshauser Strasse 4–6Germany

In clinical trials,cell therapy,especially mesenchymal stem cells(MSC),contributed to wound treatment options in an innovative ***,there are some limitations of MSC during the application process,including strict maintenance requirements and unpredictable *** order to expand the scope of application and reduce the restrictions related to direct use of SMC,the mechanisms of stem cells need to be *** latest research found that the effect of cell therapy is achieved mainly through paracrine effects,and the major bioactive vesicles which responsible for the paracrine effects is *** is a kind of extracellular membrane vesicle,which secreted from various cells and contain proteins,lipids and nucleic acids,to coordinate intercellular *** this review,the main cells type and cytokines relevant to every healing stage has been discussed,and the research about MSC-derived exosomes that has therapeutic effects has been *** last,the potential application of exosomes as a bioactive material in the treatment of wound healing and related challenges as well as its possible solutions are discussed to reveal highly effective therapeutic strategies.

关键词： Exosomes Wound healing Mesenchymal stem cells Bioactive particles

Correlation between jerky flow and jerky dynamics in a nanoscratch on a metallic glass film

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Science China(Physics,Mechanics & Astronomy) 2020年第7期63卷 89-92页

作者： LiPing Yu DongXue Han JingLi Ren XiaoXiang Guo shaokang guan Gang Wang Henan Academy of Big Data Zhengzhou University.Zhengzhou 450052China College of Science Henan University of TechnologyZhengzhou 450001China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai 200444China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Chaos has been well understood in dynamic system, however, how the chaotic behavior occur in jerky flow in material, is still not clear, and is lack of specific chaotic attractor. Here the jerky evolution of lateral force and the stair-like fluctuation of lateral displacement are observed for Ni62 Nb38(at.%) metallic glass film during nanoscratch process. This jerky flow is investigated by using the largest Lyapunov exponent, Kolmogorov entropy and fractal dimension, and chaotic behavior of lateral force-time and normal displacement-lateral displacement sequences is verified. In addition to time series analysis, it is found that jerk equation can be used to describe the jerky flow of the metallic-glass film during nanoscratch. More importantly, unambiguous chaotic attractor is presented by jerky dynamics using "jerk"-singularities, namely the total change rate of lateral force relative to scratch time. These reveal an inner connection between jerky flow and jerky dynamics in nanoscratch of a metallic-glass film.

关键词： metallic-glass film jerky flow jerky dynamics chaos

Preparation of Biodegradable Mg/β-TCP Biofunctional Gradient Materials by Friction Stir Processing and Pulse Reverse Current Electrodeposition

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Acta Metallurgica Sinica(English Letters) 2020年第1期33卷 103-114页

作者： Yabo Zhang Huiling Yang Shaoqian Lei Shijie Zhu Jianfeng Wang Yufeng Sun shaokang guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou 450002China

Mg alloys,as a new generation of biodegradable bone implant materials,are facing two tremendous challenges of enhancing strength and reducing degradation rate in physiological environment to meet clinical *** this study,tricalcium phosphate(β-TCP)particles were dispersed in Mg–2 Zn–0.46 Y–0.5 Nd alloy by friction stir processing(FSP)to produce Mg-based functional gradient materials(Mg/β-TCP FGM).On the surface of Mg/β-TCP FGM,the hydroxyapatite(HA)coating was prepared by *** effects of FSP and electrochemical parameter on the microstructure,microhardness,bonding strength and corrosion performance of the Mg/β-TCP FGM were *** four passes of FSP,a uniform and fine-grained structure was formed in Mg/β-TCP and the microhardness increased from 47.9 to 76.3 *** to the samples withoutβ-TCP,the bonding strength of the Mg/β-TCP FGM increased from 23.1±0.462 to 26.3±0.526 MPa and the addition of degradableβ-TCP contributed to the in situ growth of HA *** thickness of HA coating could be dominated by controlling the parameters of *** to the results of immersion tests and electrochemical tests in simulated body fluid,it indicated that the degradation rate of the Mg/β-TCP FGM could be adjusted.

关键词： Biodegradable magnesium alloy Biofunctional gradient materials Friction stir processing Tricalcium phosphate(β-TCP) Electrodeposition