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laser additive manufacturing of biodegradable Mg-based alloys for biomedical applications: A review

journal of Magnesium and Alloys 2022年第4期10卷 915-937页

作者： C.l.Wu W.j.Xie h.C.Man Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Metallic implants are widely used in internal fixation of bone fracture in surgical *** are mainly used for providing mechanical support and stability during bone reunion,which usually takes a few months to *** implants made of stainless steels,Ti-based alloys and CoCrMo alloys have been widely used for orthopedic reconstruction due to their high strength and high corrosion *** metallic implants will remain permanently inside the body after implantation,and a second surgery after bone healing is needed because the long-term presence of implant will lead to various *** implant removal surgery not only incurs expenditure,but also risk and psychological *** a consequence,studies on the development of biodegradable implants,which would degrade and disappear in vivo after bone reunion is completed,have drawn researchers’*** this connection,Mg-based alloys have shown great potentials as promising implant materials mainly due to their low density,inherent biocompatibility,biodegradability and mechanical properties close to those of ***,the high degradation rate of Mg-based implants in vivo is the biggest hurdle to *** from materials selection,a fixation implant is ideally tailor-made in size and shape for an individual case,for best surgical ***,laser additive manufacturing(lAM),with the advent of sophisticated laser systems and software,is an ideal process to solve these *** this paper,we reviewed the progress in lAM of biodegradable Mg-based alloys for biomedical *** effect of powder properties and laser processing parameter on the formability and quality was thoroughly *** microstructure,phase constituents and metallurgical defects formed in the lAMed samples were *** mechanical properties,corrosion resistance,biocompatibility and antibacterial properties of the lAMed samples were summarized and compared with samples fabricated by

关键词： laser additive manufacturing Magnesium alloys Implant Biomedical applications Mechanical properties Biodegradability

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luminescence properties of dysprosium doped YVO_4 phosphor

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journal of Rare Earths 2018年第12期36卷 1245-1249页

作者： h.j.Rajendra C.PANDurangappa D.l.Monika Department of Physics RNS Institute of TechnologyChannasandra Department of Physics SJB Institute of Technology

Trivalent dysprosium(Dy) activated nanocrystalline yttrium vanadate(YVO) phosphor was synthesized via co-precipitation method. The prepared samples were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), optical absorption and photo luminescence(Pl) techniques. The XRD patterns reveal the tetragonal crystalline phase. SEM images reveal that Dy doped YVOnanocrystals are agglomerated. EDAX confirms the formation of YVO:Dy. FTIR spectrum shows two strong absorption bands at 459 and 761 cm. Optical absorption spectrum showed the surface defects in the as-prepared samples. The Pl emission spectrum shows two characteristic emission bands at 485 and 575 nm. The strong yellow emission peak at 575 nm is assigned to ~4 F→~6 hhyper sensitive transition of Dyions, Study of CIE chromaticity diagram indicates the suitability of the phosphor for the development of yellow-green lEDs.

关键词： Precipitation Yttrium vanadate Dysprosium X-ray diffraction Photoluminescence Rare earths

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Different Diffusion Behavior of Cu and Ni Undergoing liquidesolid Electromigration

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journal of Materials Science & Technology 2014年第12期30卷 1235-1242页

作者： M.l.huang Z.j.Zhang h.T.Ma l.D.Chen Electronic Packaging Materials laboratory School of Materials Science & Engineering Dalian University of Technology IC Packaging Department Xi'an Institute of Microelectronic Technology

The diffusion behavior of Cu and Ni atoms undergoing liquidesolid electromigration（l-S EM） was investigated using Cu/Sn/Ni interconnects under a current density of 5.0 103A/cm2 at 250℃. The flowing direction of electrons significantly influences the cross-solder interaction of Cu and Ni atoms, i.e., under downwind diffusion, both Cu and Ni atoms can diffuse to the opposite interfaces; while under upwind diffusion,Cu atoms but not Ni atoms can diffuse to the opposite interface. When electrons flow from the Cu to the Ni, only Cu atoms diffuse to the opposite anode Ni interface, resulting in the transformation of interfacial intermetallic compound（IMC） from Ni3Sn4into（Cu,Ni）6Sn5and further into [（Cu,Ni）6Sn5t Cu6Sn5], while no Ni atoms diffuse to the opposite cathode Cu interface and thus the interfacial Cu6Sn5 *** electrons flow from the Ni to the Cu, both Cu and Ni atoms diffuse to the opposite interfaces,resulting in the interfacial IMC transformation from initial Cu6Sn5into（Cu,Ni）6Sn5and further into[（Cu,Ni）6Sn5t（Ni,Cu）3Sn4] at the anode Cu interface while that from initial Ni3Sn4into（Cu,Ni）6Sn5and further into（Ni,Cu）3Sn4at the cathode Ni interface. It is more damaging with electrons flowing from the Cu to the Ni than the other way.

关键词： Cu/Sn/Ni Electromigration Cross-solder interaction Interfacial reaction Diffusion

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Effects of temperature on the tribological behavior of Al0.25CoCrFeNi high-entropy alloy

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journal of Materials Science & Technology 2019年第5期35卷 917-925页

作者： l.M.Du l.W.lan S.Zhu h.j.Yang X.h.Shi P.K.liaw j.W.Qiao Research Center for high-Entropy Alloys College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China National Key laboratory for Remanufacturing Academy of Armored Forces Engineering Beijing 100072 China Department of Materials Science and Engineering The University of Tennessee Knoxville TN 37996-2200 USA

The tribological behavior of Al0.25 CoCrFeNi high-entropy alloy(hEA) sliding against Si3N4 ball was investigated from room temperature to 600°. The microstructure of the alloys was characterized by simple FCC phase with 260 hV. Below 300°, with increasing temperature, the wear rate increased due to high temperature softening. The wear rate remained stabilized above 300°due to the anti-wear effect of the oxidation film on the contact interface. The dominant wear mechanism of hEA changed from abrasive wear at room temperature to delamination wear at 200°, then delamination wear and oxidative wear at 300°and became oxidative above 300°. Moreover, the adhesive wear existed concomitantly below 300°.

关键词： Abrasive wear Friction and wear characteristics hardness high temperature Microstructure Oxidation Rapid solidification Sliding Wear mechanism

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Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys

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journal of Materials Science & Technology 2014年第12期30卷 1296-1300页

作者： X.W.li l.Wang j.S.Dong l.h.lou Superalloys Division Institute of Metal Research Chinese Academy of Sciences

Evolution of the morphology of MC carbides with the change of cooling rate and carbon content in two kinds of nickel-base superalloys, K417 G and DD33, has been investigated. The morphology of MC carbides evolves from faceted to script-like with increasing cooling rate. Varying the carbon content from 40X10-6 to 320X10-6, the morphology of carbides changes from blocky, rod-like into script-like. Scanning electron microscopy observation of deep-etched samples indicates that these carbides evolve from octahedral to dendritic and then into welldeveloped dendrites accordingly in a three-dimensional manner. The morphology evolution is discussed from the viewpoint of the preferential growth orientation of fcc crystals and the carbide growth rate during directional solidification.

关键词： Carbides morphology Directional solidification Three-dimensional microstructure Nickel-base superalloys

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Effect of Silver Content on Microstructure and Properties of Brass/steel Induction Brazing joint Using Ag-Cu-Zn-Sn Filler Metal

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journal of Materials Science & Technology 2011年第4期27卷 377-381页

作者： j. Cao l.X. Zhang h.Q. Wang l.Z. Wu j.C. Feng State Keylab of AdvanCed Welding Production Technology Harbin Instituteof Technology Harbin 150001 China Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150001 China

The induction brazing of brass to steel using Ag-Cu-Zn-Sn filler metal was investigated in this study. The influence of A8 content on the microstructure and properties were analyzed by means of optical microscopy, scanning electron microscopy and electron probe microanalysis. Defect free joint was achieved using Ag- Cu-Zn-Sn filler metal. The microstructure of the joint was mainly composed of Ag-based solid solution and Cu-based solid solution. The increase of A8 content and the cooling rate both led to the increase of the needle like eutectic structure. The tensile strength decreased with the increase of Ag content. The tensile strength at room temperature using Ag25CuZnSn filler metal reached 445 MPa. All fractures using Ag-Cu-Zn-Sn filler metal presented ductile characteristic.

关键词： Induction brazing Brass Steel Microstructure Tensile strength

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Ultrasonic-based surface patterning and interfacial reaction of ZrO_(2)ceramics

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journal of Materials Science & Technology 2023年第24期155卷 202-210页

作者： h.j. Dong Z.l. li X.G.Song j.C. Feng S.j. Wei j.h. Fu Y. Shi State Key laboratory of Advanced Welding and joining Harbin Institute of Technology Harbin 150001 China Shandong Provincial Key lab of Special Welding Technology Harbin Institute of Technology at Weihai Weihai 264209 China

We demonstrate a process to achieve selective surface metallization of ZrO_(2)ceramics using ultrasound technology in atmospheric environments at 350℃,which bestows good weldability of ZrO_(2)to achieve rapid and reliable connections with other metals as well as ceramic *** challenge is that brazing or diffusion welding processes to accomplish metallurgical connections for ZrO_(2) typically require holding at elevated temperatures for minutes to hours,while the selective ultrasonic metallization process requires only a few seconds of processing without the application of covering films or solder *** this study,the selected Sn-2Ti alloy could effectively wet and spread on ZrO_(2)substrate under ultrasonication,and continuous interphase layers were rapidly formed in situ between ZrO_(2)and *** bonding strength for the ZrO_(2)/Sn-2Ti interface was well established with the highest shear strength of 37.1 MPa,and the fracture location occurred at the filler *** interfacial reaction layer thickened remarkably with the prolongation of sonication,accompanied by the partial crystallization of amorphous TiO and the formation of irregularly striped Ti_(11.31)Sn_(3)O_(10)nanocrystals.

关键词： Selective ultrasonic metallization Zirconia surface patterning low temperature connection Sono-oxidation Interfacial reaction

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Indo-norwegian Initiative for Enhanced Use of Mineral Waste in Indian Cement and Concrete Industry

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武汉理工大学学报 2010年第17期32卷 246-251页

作者： ENGElSEN C j jUSTNES h PAWAN l SINTEF Building and Infrastructure Oslo 0314Norway SINTEF Building and Infrastructure Trondheim 7465Norway National Environmental Engineering Research Institute Nehru Marg Nagpur 440020India

The industry-oriented-bilateral project ( "Environmental friendly strategy for Waste Management in India Utilising Cement and Concrete Production Technology" ) between India and Norway was established in 2009 and will continue to the end of 2011. It aims to further increase the utilisation of mineral wastes in Indian cement and concrete industry in an environmentally and scientifically sound way in order to ensure sustainable energy and resource management. The project intends to advance the state of the art regarding blended cement and concrete technology as well as provide practical solutions and guidelines. Emphasis are given to the synergies achieved by using ternary binder systems in concrete mixes as well as the use of appropriate admixtures in order to integrate certain waste materials at higher levels than today's practice. The prioritised materials are coal combustion residues,slag and C&D waste. The background,project concept and the current status are presented.

关键词： concrete additive tottom ash fly ash pond ash mineral waste

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Magneto-Impedance Effect of Composite Wires Prepared by Chemical Plating under DC Current

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Nano-Micro letters 2014年第3期6卷 227-232页

作者： D.l.Chen X.li h.l.Pan h.Y.luan Z.j.Zhao Department of Physics Engineering Research Center for Nanophotonics & Advanced Instrument Ministry of Education East China Normal University

CuBe composite wires of 100 μm in diameter coated with a layer of NiCoP were prepared by a chemical plating method under DC current(CPUDC). The influences of DC current on coating morphology,deposition rate, composition, giant magneto-impedance(GMI) effect and magnetic properties were *** was shown that the circumferential domain structure of coating layer was induced by the DC current going through the wires. A maximum GMI ratio of 870% was obtained in the composite wire prepared under 150 m A and tested at 180 k hz. It is 30 times higher than that of the composite wire plated in the same condition by conventional chemical plating method, indicating that CPUDC is an easy and effective approach to obtain composite wires and its applications will be further extended on magnetic sensors.

关键词： GMI Chemical plating Magnetic properties

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Quantitative law of diffusion induced fracture

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Acta Mechanica Sinica 2016年第4期32卷 611-632页

作者： h.-j.lei h.-l.Wang B.liu C.-A.Wang AMl CNMMDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China State Key lab of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Through dimension analysis, an almost analytical model for the maximum diffusion induced stress（DIS）and critical temperature（or concentration） difference at which cracks begin to initiate in the diffusion process is developed. It interestingly predicts that the spacing of diffusioninduced cracks is constant, independent of the thickness of specimen and the temperature difference. These conclusions are validated by our thermal shock experiments on alumina plates. Furthermore, the proposed model can interpret observed hierarchical crack patterns for high temperature jump cases, and a three-stage relation between the residual strength and the temperature difference. The prediction for crack spacing can guide the biomimetic thermal-shockfailure proof design, in which the hard platelets smaller than the predicted diffusion induced by constant crack-spacing are embedded in a soft matrix, and, therefore, no fracture will happen. This may guide the design of the thermal protection system and the lithium ion battery. Finally we present the maximum normalized DISes for various geometry and boundary conditions by single-variable curves for the stressindependent diffusion process and two-variable contour plots for the stress-dependent diffusion process, which can provideengineers and materialists a simple and easy way to quickly evaluate the reliability of related materials and devices.

关键词： normalized hierarchical contour spacing quickly lithium validated battery constraint coordinate

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