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Journal of Iron and Steel Research International 2020年第4期27卷 433-439页

作者： Le Zhang Wei Wang m.babar shahzad Yi-yin Shan Ke Yang Institute of metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina School of materials Science and Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina Key Laboratory of Nuclear materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina

A 5-layer laminated metal composite composed of ultrahigh-strength maraging steel and ductile 316L stainless steel was fabricated by hot pressing in vacuum and post-heat *** characterization on hierarchical structure of the composite before and after heat treatment was made by optical microscopy,scanning electron microscopy and electron back-scattered diffraction technique,***,the difference of mechanical performance on both sides of the interface was characterized by nano-hardness *** tensile test showed that superior interfacial bonding was achieved due to the micro-‘bite’structure between the two steels without obvious defects or oxides at the interface and with coordinated deformation of the two ***,a laminated metal composite consisting of two different constituents with extreme difference in strength can be well fabricated.

关键词： maraging steel Austenitic stainless steel Laminated metal composite Hierarchical structure Interfacial

Ultra-thin Laminated metal Composites with Ultra-high Strength and Excellent Soft magnetic Properties

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Acta metallurgica Sinica(English Letters) 2020年第3期33卷 385-390页

作者： Le Zhang Wei Wang Xiaofei Xiao m.babar shahzad Yiyin Shan Ke Yang Institute of metal Research Chinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nuclear materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Structural metallic materials with excellent functional performance and lightweight features have always been the goal of material scientists’ *** this work,laminated metal composites of different thicknesses(less than 0.4 mm) composed of structural materials with great differences in deformation ability were successfully fabricated via a novel processing ***-high strength and excellent soft magnetic properties were combined perfectly in the ultra-thin and super-light laminated metal composite strips due to unique structural design and essential attributes of the initial *** results emphasize the significant potential application value of the ultra-thin laminated metal composites in the field of structural and functional integration.

关键词： Laminated metal composites Ultra-high strength Ultra-thin Soft magnetic property maraging steel

Hot deformation behavior of Cu-bearing antibacterial titanium alloy

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Journal of materials Science & Technology 2018年第10期34卷 1867-1875页

作者： Zheng ma Ling Ren m.babar shahzad Rui Liu Ying Zhao Ke Yang Institute of metal Research Chinese Academy of Sciences Center for Human Tissues and Organs Degeneration Shenzhen Institute of Advanced Technology Chinese Academy of Science

We investigated the deformation behavior of a new biomedical Cu-bearing titanium alloy （Ti-645 （Ti-6.06AI-3.75V-4.85Cu, in wt%）） to optimize its microstructure control and the hot-working process. The results showed that true stress-true strain curve ofti-645 alloy was susceptible to both deformation tem-perature and strain rate. The microstructure of Ti-645 alloy was significantly changed from equiaxed grain to acicular one with the deformation temperature while a notable decrease in grain size was recorded as well. Dynamic recovery （DRV） and dynamic recrystallization （DRX） obviously existed during the thermal compression of Ti-645 alloy. The apparent activation energies in （α ＋ β） phase and β single phase regions were calculated to be 495.21 kJ mo1^-1 and 195.69 kJ mo1^-1, respectively. The processing map showed that the alloy had a large hot-working region whereas the optimum window occurred in the strain rate range of 0.001-0.1 s-1, and temperature range of 900-960℃ and 1000-1050℃. The obtained results could provide a technological basis for the design of hot working procedure of Ti-645 alloy to optimize the material design and widen the ootential application of Ti-645 alloy in clinic.

关键词： cu-bearing titanium alloy Constitutive equation Thermal deformation microstructure Processing map

Dissolution and repair of passive film on Cu-bearing 304L stainless steels immersed in H_2SO_4 solution

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Journal of materials Science & Technology 2018年第11期34卷 2149-2159页

作者： Xinrui Zhang Jinlong Zhao Tong Xi m.babar shahzad Chunguang Yang Ke Yang School of materials Science and Engineering University of Science and Technology of China Institute of metal Research Chinese Academy of Sciences

The antibacterial Cu-bearing 304 L stainless steel is a new kind of structural and functional integrated metal material. In this work, evolution behavior of passive film of different heat treated Cu-bearing 304 L stainless steel immersed in 0.5 m H2SO4 solution was investigated by using electrochemical measurements, atomic force microscopy（AFm） observation and X-ray photoelectron spectroscopy（XPS） *** results show that the solution and aging treated samples have the similar polarization behaviors. The passive film impedance experiences an initial decrease within 7 days followed by a subsequent increase,while the defect density of passive film presents the opposite trend. meanwhile, the evolution of surface morphology and the estimated thickness of the passive film confirm that it experiences initial dissolution and follow-up repair. Furthermore, the Cr^3＋ content in passive film undergoes sequential reduction to increase, however the variation tendency of Cu^2＋ content is just opposite, indicating that the content variation of Cr and Cu in passive film reflects the competitive process of film dissolution and repair. In addition, compared with solution treated samples, aged samples have a bigger icorrvalue and the rougher passive film. This indicates that the passive film of solution treated steel is more compact and stable.

关键词： Cu-bearing stainless steel 304L-Cu Passive film

Role of Co in formation of Ni-Ti clusters in maraging stainless steel

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Journal of materials Science & Technology 2018年第9期34卷 1671-1675页

作者： Jialong Tian m.babar shahzad Wei Wang Lichang Yin Zhouhua Jiang Ke Yang School of materials Science and Engineering Northeastern University Shenyang 110004 China Institute of metal Research Chinese Academy of Sciences Shenyang 110016 China Shenyang National Laboratoryfor materials Science 72 Wenhua Road Shenyang 110016 China School of metallurgy Northeastern University Shenyang 110004 China

The effect of Co addition on the formation of Ni-Ti clusters in maraging stainless steel was studied by three dimensional atom probe（3 DAP） and first-principles calculation. The cluster analysis based on the maximum separation approach showed an increase in size but a decrease in density of Ni-Ti clusters with increasing the Co content. The first-principles calculation indicated weaker Co-Ni（Co-Ti） interactions than Co-Ti（Fe-Ti） interactions, which should be the essential reason for the change of distribution characteristics of Ni-Ti clusters in bcc Fe caused by Co addition.

关键词： maraging stainless steels Ni-Ti cluster First-principles calculation Three-dimensional atom probe

Corrosion Resistance of Co-containing maraging Stainless Steel

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Acta metallurgica Sinica(English Letters) 2018年第8期31卷 785-797页

作者： Jia-Long Tian Wei Wang m.babar shahzad Wei Yan Yi-Yin Shan Zhou-Hua Jiang Ke Yang School of materials Science and Engineering Northeastern University Institute of metal Research Chinese Academy of Sciences School of metallurgy Northeastern University

Corrosion resistance behavior of Co-containing maraging stainless steels was investigated. Neutral salt spray and polarization test showed that maraging stainless steel with high Co content showed poor corrosion behavior. microstructure observation proved that segregation of Cr in the matrix deteriorated its corrosion resistance. The surface morphology of the aged maraging stainless steel with high Co content indicated that during passivation process, the newly formed passive film with sinusoidal distribution readily destroyed by the corrosive medium, hence, causing poor corrosion resistance. moreover, through first-principles calculation it was proved that Co increased Fe–Fe ferromagnetic interaction which facilitated the formation Cr-rich clusters.

关键词： maraging stainless steel Corrosion resistance Passive film Atom probe tomography First-principles calculation

High nitrogen stainless steel drug-eluting stent-Assessment of pharmacokinetics and preclinical safety in vivo

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Bioactive materials 2020年第4期5卷 779-786页

作者： Shanshan Chen Zhifeng Yao Yongbiao Guan Hui Yang m.babar shahzad Yizhe Wu Bingchun Zhang Li Shen Ke Yang Institute of metal Research Chinese Academy of Sciences72 Wenhua RoadShenyang110016China Shanghai Institute of Cardiovascular Diseases Department of CardiologyZhongshan HospitalFudan University180 Fenglin RoadShanghai200032China National Beijing Center for Drug Safety Evaluation and Research Beijing Institute of Pharmacology and ToxicologyAcademy of Military Medical Sciences27 Taiping RoadHaidian DistrictBeijing100850People's Republic of China

Pharmacokinetic analyses were performed using 20 pigs for 120-days implantation,while one sirolimus-eluting stent was implanted into one of their coronary *** different time points,the residual sirolimus on the stent,delivered locally(to artery wall),regionally(to adjacent and downstream muscle)and systemically(to plasma and visceral organs),was detected throughout 120 *** safety evaluation was performed using 32 pigs for 180-days implantation to study the safety of metal platform material and the effectiveness of sirolimus eluting coating on the HNS *** neointima area,restenosis rate and inflammatory grade for HNS and control group stents were detected and *** 80%sirolimus was eluted from the sirolimuseluting stents after 30-days implantation in ***,there was sustained sirolimus in the artery wall,cardiac muscle and heart throughout 120-days implantation,and sirolimus accumulated to the peak at 90-days *** was inferred that the sirolimus eluting stent in this study was covered by neointima before 90-days implantation,indicating that the sirolimus eluting coating on the HNS stent was safe and *** little sirolimus was distributed in visceral organs after 14-days *** sirolimus-eluting stent exhibited lower restenosis rate and lower inflammatory grade than control group,which verified that the sirolimus-eluting coating design in this study was reasonable and *** addition,there were no significant difference in restenosis rate and inflammatory score between HNS bare-metal stent and drug-eluting stents,illustrating that HNS has good bio-compatibility and is suitable to use as coronary artery stent material.

关键词： Sirolimus-eluting stent Pharmacokinetics Preclinical safety Tissue response

Recent progress in two-dimensional metallenes and their potential application as electrocatalyst

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Journal of Energy Chemistry 2024年第7期94卷 577-598页

作者： Umer shahzad mohsin Saeed muhammad Fazle Rabbee Hadi m.marwani Jehan Y.Al-Humaidi muhammad Altaf Raed H.Althomali Kwang-Hyun Baek md.Rabiul Awual mohammed m.Rahman Department of Chemistry Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Biotechnology Yeungnam UniversityGyeongsanSouth Korea Center of Excellence for Advanced materials Research(CEAmR) King Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Chemistry College of SciencePrincess Nourah Bint Abdulrahman UniversityP.O.BOX 84428Riyadh 11671Saudi Arabia Department of Chemistry Center of Excellence for Innovation in Chemistry(PERCH-CIC)Center of Excellence in Materials Science and TechnologyFaculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Department of Chemistry College of Art and SciencePrince Sattam Bin Abdulaziz UniversityWadi Al-Dawasir 11991Saudi Arabia Western Australian School of mines:minerals Energy and Chemical EngineeringCurtin UniversityGPO Box U 1987PerthWA 6845Australia

In this article,we looked at metallenes,a novel class of two-dimensional(2D)metals that are attracting interest in the energy and catalysis *** is one area where their exceptional physicochemical and electrical characteristics might be *** are unique because they include several metal atoms that are not in a coordinated *** makes them more active and improves their atomic uti-lization,which in turn increases their catalytic *** article delves into the potential of two-dimensional metals as electrocatalysts for carbon dioxide reduction,fuel oxidation,oxygen evolution,and oxygen reduction reactions in the context of sustainable energy *** to the exception-ally high surface-to-volume ratio,large surface area as well as their optimized atomic use efficiency,2D materials defined by atomic layers are crucial for surface-related sustainable energy *** to its exceptional properties,such as high conductivity and the ability to enhance the exposure of active metal sites,2D metallenes have recently attracted a lot of interest for use in catalysis,electronics,and energy-related *** their highly mobility,adjustable surface states,and electrical struc-tures that can be fine-tuned,2D metallenes are promising nanostructure materials for use in energy con-version with the sustainable applications.

关键词： metallenes Electrocatalysts Electrochemical processes Atomically thin structure

Al^(3+) doped CeO_(2) for proton conducting fuel cells

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International Journal of minerals,metallurgy and materials 2024年第10期31卷 2253-2262页

作者： Sarfraz shahzad Rasool muhammad Khalid mAKYousaf Shah Bin Zhu Jung-Sik Kim muhammad Imran Asghar Nabeela Akbar Wenjing Dong Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology/Energy Storage joint Research Center School of Energy and EnvironmentSoutheast UniversityNanjing 210096China School of microelectronics Hubei UniversityWuhan 430062China Sino-French Engineer School/School of General Engineering Beihang UniversityBeijing 100191China Renewable Energy Technologies Group Faculty of Engineering and Natural SciencesTampere UniversityFI-33014Finland

Developing high ionic conducting electrolytes is crucial for applying proton-conducting fuel cell(PCFCs)*** cur-rent study investigates the effect of alumina on the structural,morphological,electrical,and electrochemical properties of CeO_(2).Lattice oxygen vacancies are induced in CeO_(2) by a general doping concept that enables fast ionic conduction at low-temperature ranges(300-500℃)for *** refinement of the X-ray diffraction(XRD)patterns established the pure cubic fluorite structure of Al-doped CeO_(2)(ADC)samples and confirmed Al ions’fruitful integration in the CeO_(2) *** electronic structure of the alumina-doped ceria of the materials(10ADC,20ADC,and 30ADC)has been *** a result,it was found that the best composition of 30ADC-based electrolytes induced maximum lattice oxygen *** corresponding PCFC exhibited a maximum power output of 923 mW/cm^(2)at 500℃.moreover,the investigation proves the proton-conducting ability of alumina-doped ceria-based fuel cells by using an oxide ion-blocking layer.

关键词： proton ceramic fuel cells oxygen vacancies higher fuel cell performance doping fast ions transportation

枯草芽孢杆菌YZ-1突变体库构建与产表面活性素优势菌株筛选

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西南农业学报 2024年

作者：万莉何月秋谢鑫欣刘迎龙何鹏搏 mUNIR shahzad 吴毅歆何鹏飞云南农业大学农学与生物技术学院云南农业大学植物保护学院

【目的】拟通过构建高效杀虫枯草芽孢杆菌YZ-1的转座突变体库，从中筛选出高产表面活性素的突变体菌株，为后续YZ-1的表面活性素合成调控机制解析和开发利用提供前期材料。【方法】利用携带转座子TnYLB-1和温敏型复制蛋白的穿梭载体pmar... 详细信息

【目的】拟通过构建高效杀虫枯草芽孢杆菌YZ-1的转座突变体库，从中筛选出高产表面活性素的突变体菌株，为后续YZ-1的表面活性素合成调控机制解析和开发利用提供前期材料。【方法】利用携带转座子TnYLB-1和温敏型复制蛋白的穿梭载体pmarA转化YZ-1，通过50 ℃温度诱导转座子转座、抗性培养复筛以及特异性PCR扩增验证，构建YZ-1菌株的转座突变体库。组合使用血平板法初筛、溴百里香酚蓝比色法复筛及HPLC定量检测，从突变体库中筛选表面活性素合成显著增强的突变体。【结果】通过自然转化成功地将pmarA质粒导入枯草芽孢杆菌YZ-1中，获得含有3000株转座突变子的YZ-1突变体库，从中筛选出11株表面活性素合成增强的候选菌株。HPLC检测显示与YZ-1野生型相比，表面活性素合成增强和相似的突变体有5株（m1、m6、m7、m8及m9），显著下降有6株（m2、m3、m4、m5、m10及m11），其中表面活性素产量最高的m8突变体为282.4 mg/L较野生型增加了13.7%，而最低的m2菌株为47.53 mg/L，较野生型下降了80.9%。【结论】增设抗性复筛培养可提高YZ-1突变体库的正确率。基于血平板培养和溴百里香酚蓝比色的高通量筛选与HPLC定量检测的YZ-1表面活性素增强型突变体筛选结果不理想，还需进一步改进。

关键词：枯草芽孢杆菌表面活性素 TnYLB-1转座子 pmarA质粒 Himar1转座元件