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Solute-solute interactions and their impacts on solute co-segregation and interfacial cohesion of{1012}twin boundary in zinc

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Journal of Materials Science & Technology 2023年第7期138卷 117-128页

作者： Zhifeng Huang Jian-Feng Nie Department of Materials Science and Engineering Monash UniversityMelbourneVIC 3800Australia

Interactions of solute atoms in biodegradable Zinc alloys and their effect on alloy mechanical properties have been less investigated.In this work,the interactions between the common solutes(Li,Mg,Mn,Cu,and Ag)used in the biodegradable Zn alloys,including a solute-solute pair with the same element or with two different elements,are investigated based on first-principles calculations.It is found that the energetically favorable configuration is the third nearest-neighboring for most solute-solute pairs in the bulk lattice because of the relatively strong electronic interaction between solute and Zn atoms or the relatively small local elastic deformation associated with the configuration.Considering that interfacial cleavage is a key fracture mode of zinc,the segregation ability of these solutes and their effect on the{1012}twin boundary cohesion are also examined.The result shows that Li tends to fully occupy its preferred site in the twin boundary,while Mg,Mn,Cu,or Ag has a concentration limitation in the twin boundary.The twin boundary cohesion can be significantly enhanced by the segregation of Mn,followed by Cu and Ag,because of the contribution of their d states close to the Fermi level.Furthermore,the co-segregation ability of two solute atoms in the twin boundary increases with increasing the binding tendency of these two solute atoms in the boundary.Mn and Li or Mg show a relatively strong co-segregation ability in the twin boundary.Adding Mn to Zn-Li or Zn-Mg alloys can significantly enhance the resistance to fracture of twin boundaries.

关键词： Zinc alloys Twin boundary Solute-solute interaction Co-segregation Interfacial fracture

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Second phase refining induced optimization of Fe alloying in Zn:Significantly enhanced strengthening effect and corrosion uniformity

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 796-806页

作者： Zhangzhi Shi Changheng Li Meng Li Xiangmin Li Luning Wang Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Advanced Materials Processing of Ministry of EducationBeijing Laboratory of Metallic Materials and Processing for Modern TransportationSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Many non-toxic alloying elements,such as Fe,Ca,and Sr,have negligible solid solubilities in Zn matrix,leading to formation of coarse second phase particles.They exhibit low strengthening effects but highly detrimental to ductility.So refining second phase is a common pursuit for Zn alloys.The present paper takes Zn-0.3Fe alloy suffered from coarse FeZn_(13) second phase particles as a touchstone to testify microstructure refining effect through solidification with an accelerated speed and multi-pass rolling.FeZn_(13) particles are refined from 24 to 2μm,and Zn grains are refined to 5μm.As a result,the strengthening effect of Fe is enhanced significantly,with yield strength and the ultimate tensile strength of the alloy increased from 132 to 218 MPa and from 159 to 264 MPa,respectively.Furthermore,corrosion non-uniformity and penetration are much alleviated.These results show that microstructure refinement,especially on coarse intermetallic second phases,has a great potential to improve mechanical and degradation properties of biodegradable Zn alloys.

关键词： Zinc alloys microstructure mechanical properties corrosion uniformity

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Fatigue and corrosion fatigue behaviors of biodegradable Zn-Li and Zn-Cu-Li under physiological conditions

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Journal of Materials Science & Technology 2022年第36期131卷 48-59页

作者： Huafang Li Yan Huang Xiaojing Ji Cuie Wen Lu-Ning Wang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China School of Engineering RMIT UniversityMelbourneVictoria 3001Australia

zinc(Zn)alloys are emerging as a new class of biodegradable metallic materials due to their good biocompatibility,suitable biodegradability,and nontoxicity.However,the dynamic loading in the human body,along with the corrosive physiological environment,brings great challenges to the application of biodegradable Zn alloys.At present,there are few reports on the fatigue and corrosion fatigue properties of Zn alloys in simulated body fluid(SBF).In the present work,extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys were selected in order to systematically evaluate their fatigue and corrosion fatigue behaviors both in air at ambient temperature and in SBF at 37℃.Results revealed that the fatigue limits of the extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys were about 135 and 180 MPa,respectively,in air at ambient temperature.However,the fatigue limits of the two alloys decreased to 65 and 80 MPa,respectively,in SBF at 37℃and showed a linear relationship between the corrosion fatigue life and the stress amplitude.The sources of fatigue cracks in air were internal microstructural defects or weak mechanical properties of the material,while the initiation of corrosion pits on the surface was the main reason for the source of the formation of fatigue cracks in SBF.The fracture mode of the extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys was quasi-cleavage fracturing.Compared to static immersion testing,cyclic loading significantly increased the corrosion rates of the two experimental alloys in a corrosion fatigue environment.

关键词： Biodegradable metals Biomedical applications Corrosion fatigue behaviors Fatigue behaviors Zinc alloys

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Zn-Mg and Zn-Cu alloys for stenting applications:From nanoscale mechanical characterization to in vitro degradation and biocompatibility

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Bioactive Materials 2021年第12期6卷 4430-4446页

作者： Claudia García-Mintegui Laura Catalina Córdoba Judit Buxadera-Palomero Andrea Marquina Emilio Jiménez-Piqué Maria-Pau Ginebra JoséLuis Cortina Marta Pegueroles Biomaterials Biomechanics and Tissue Engineering GroupDepartment of Materials Science and EngineeringTechnical University of Catalonia(UPC)Barcelona East School of Engineering(EEBE)08019BarcelonaSpain Resource Recovery and Environmental Management Group UPCEEBE08019BarcelonaSpain Barcelona Research Center in Multiscale Science and Engineering UPCEEBE08019BarcelonaSpain Institute for Bioengineering of Catalonia(IBEC) 08028BarcelonaSpain Structural Integrity Micromechanics and Reliability of Materials GroupDepartment of Materials Science and EngineeringUPCEEBE08019BarcelonaSpain

In the recent decades,zinc(Zn)and its alloys have been drawing attention as promising candidates for bioresorbable cardiovascular stents due to its degradation rate more suitable than magnesium(Mg)and iron(Fe)alloys.However,its mechanical properties need to be improved in order to meet the criteria for vascular stents.This work investigates the mechanical properties,biodegradability and biocompatibility of Zn-Mg and Zn-Cu alloys in order to determine a proper alloy composition for optimal stent performance.Nanoindentation measurements are performed to characterize the mechanical properties at the nanoscale as a function of the Zn microstructure variations induced by alloying.The biodegradation mechanisms are discussed and correlated to microstructure,mechanical performance and bacterial/cell response.Addition of Mg or Cu alloying elements refined the microstructure of Zn and enhanced yield strength(YS)and ultimate tensile strength(UTS)proportional to the volume fraction of secondary phases.Zn-1Mg showed the higher YS and UTS and better performance in terms of degradation stability in Hanks’solution.Zn-Cu alloys presented an antibacterial effect for S.aureus controlled by diffusion mechanisms and by contact.Biocompatibility was dependent on the degradation rate and the nature of the corrosion products.

关键词： Zinc alloys Bioresorbable metals Galvanic corrosion Nanoindentation Biocompatibility

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Fine-tuning of mechanical properties in a Zn-Ag-Mg alloy via cold plastic deformation process and post-deformation annealing

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Bioactive Materials 2021年第10期6卷 3424-3436页

作者： Maria Wątroba Wiktor Bednarczyk Jakub Kawałko Piotr Bała AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer ScienceAl.A.Mickiewicza 3030-059 KrakowPoland AGH University of Science and Technology Academic Centre for Materials and NanotechnologyAl.A.Mickiewicza 3030-059 KrakowPoland

In recent years,Zn-based materials have been extensively investigated as potential candidates for biodegradable implant applications.The introduction of alloying elements providing solid-solution strengthening and second phase strengthening seems crucial to provide a suitable platform for the thermo-mechanical strengthening of Zn alloys.In this study,a systematic investigation of the microstructure,crystallographic texture,phase composition,and mechanical properties of a Zn-3Ag-0.5Mg(wt%)alloy processed through combined hot extrusion(HE)and cold rolling(CR),followed by short-time heat treatment(CR+HT)at 200◦C was conducted.Besides,the influence of different annealing temperatures on the microstructure and mechanical properties was studied.An adequate combination of processing conditions during CR and HT successfully addressed brittleness obtained in the high-strength HE Zn-3Ag-0.5Mg alloy.By controlling the microstructure,the most promising results were obtained in the sample subjected to 50%CR reduction and 5-min annealing,which were:ultimate tensile strength of 432 MPa,yield strength of 385 MPa,total elongation to failure of 34%,and Vickers microhardness of 125 HV0.3.The obtained properties clearly exceed the mechanical benchmarks for biodegradable implant materials.Based on the conducted investigation,brittle multi-phase Zn alloys’mechanical performance can be substantially enhanced to provide sufficient plasticity by grain refinement through cold deformation process,followed by short-time annealing to restore proper strength.

关键词： Zinc alloys Cold rolling Heat treatment Mechanical properties Grain refinement

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Piezoelectric film electro-deposition for optical fiber sensor with ZnO coating

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Chinese Optics Letters 2008年第6期6卷 462-464页

作者：周力顾平周雅 School of Electronic Information-Engineering Nanchang Hangkong University Guangxi Key Lab for the Advance Material and New Preparation Technology

The piezoelectric film electro-deposition for optical fiber sensor with ZnO coating is studied. The zinc oxide plating film is made on the copper surface directly by cathodic electro-deposition in the Zn（NO3）2 single salt aqueous solution systems. The influences of main experimental conditions on the properties of ZnO thin film in the electro-deposition processes are analyzed and a stable, practical and economic technique is obtained.

关键词： Composite structures Copper Copper oxides Fibers Optical fibers Optical materials Piezoelectricity Sensors zinc Zinc alloys

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CdZnTe Energy Levels Induced by Doping of Indium

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Chinese Physics Letters 2004年第2期21卷 367-369页

作者：李国强介万奇谷智杨戈王涛 StateKeyLaboratoryofSolidificationProcessing NorthwesternPolytechnicalUniversityXi'an710072 StateKeyLaboratoryofSolidificationProcessing NorthwesternPolytechnicalUniversityXi'an710072

Photoluminescence (PL) and infrared transmission spectra are used to characterize In-doped Cd0.9Zn0.1Te (CdZnTe:In). The PL spectrum reveals that there are two other strong emissions situated at 1.54eV and 1.62eV as well as the near band edge emission. This indicates that the doped In can lead to two donor levels of 0.12eV and 0.04eV in the CdZnTe band construction, respectively. The IR transmission spectra show that when the wavenumber is larger than 1000cm−1, the CdZnTe:In was almost opaque to the IR emission. Then its IR transmission rapidly increases to 52% when the wavenumber is decreased to 350cm−1 and then holds constant. This confirms the existence of the donor level of 0.12eV.

关键词： Zinc alloys

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QUANTITATIVE CHARACTERIZATION OF STRESS-STRAIN HYSTERESIS LOOPS OF Cu-Zn-Al SHAPE MEMORY ALLOY

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Acta Metallurgica Sinica(English Letters) 2001年第2期14卷 97-102页

作者： Y.F. Guo, Y.Z. Huo, C.T. Zeng, X.T. Zu (Department of Metal Materials, Sichuan University, Chengdu 610065, China) (Department of Physics, Sichuan University, Chengdu 610064, China) Department of Metal Materials Sichuan University

A six-parameter mathematical model was introduced to simulate the stress-strain hysteresis and the sinner hysteresis of polycrystalline shape memory alloys (SMAs). By the comparison with experiments of Cu-Zn-Al SMA, it was shown that the model could be used to calculate the stress-strain relations with rather good accuracy. Moreover, it was found that the six parameters introduced in this paper represented the characteristics of the stress-strain hysteresis of polycrystalline SMAs and could be used to characterize the hysteresis quantitatively.

关键词： Characterization Hysteresis Shape memory effect Strain Stresses Zinc alloys

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TENSILE PROPERTIES AND CREEP RESISTANCE OF AZ91 ALLOY CONTAINING ANTIMONY

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Acta Metallurgica Sinica(English Letters) 2000年第3期13卷 867-871页

作者： Yuan, G.Y. Sun, Y.S. Zhang, W.M. Bao, Y.H. Southeastern Univ Nanjing China

Small amount of antimony addition to the Mg-9Al-0.8Zn-0.2Mn(AZ91) alloy results in the obvious increase of tensile strength at both ambient and elevated temperatures. The creep resistance at the temperatures up to 200°C is also improved significantly by antimony addition. Microstructural observations revealed that the addition of antimony modifies morphology of the β(Mg17Al12) phase and causes the formation of some rod-shaped precipitates Mg3Sb2 at grain boundaries. These precipitates have high thermal stability and play an important role for strengthening grain boundaries at elevated temperatures.

关键词： Aluminum alloys Antimony Automobile materials Creep testing Grain boundaries Microstructure Tensile stress Tensile testing Zinc alloys

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Damping Capacity and Creep Resistance of Spray Deposited High Silicon Alloy ZA27

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Journal of Materials Science & Technology 1998年第2期14卷 115-120页

作者： Liu, Yongchang Yang, Gencang Lu, Yili Yang, Liushuan Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Peoples R China Luoyang Inst Technol Dept Mat Sci & Technol Luoyang 471039 Peoples R China

Alloying and spray deposition technique were adopted to improve the the service temperature limitation of the alloy ZA27 in an effort to develop a new functional material with high damping capacity and good elevated temperature mechanical property. The effects of addition of 5 wt pct of Si on the damping behavior and elevated temperature creep resistance of alloy ZA27 were investigated. The damping capacity, as well as the relative dynamic modulus, were measured at frequency of 1.4 Hz over the 303 to 573 K. No peak phenomenon was observed for the specimens tested in the temperature range of interest. Experimental results indicate that the damping capacity of the deposited material is 2.8 times higher than that of the cast one at 305 K. The ball hardness values were used to evaluate the creep property and the creep activation energy of the deposited material is 3.9-5.7 kJ per mol higher than that of the as-cast one. The creep rate formulation was also derived. Finally, The operative damping and creep mechanisms were discussed in the light of the data obtained from its characterization of microstructure, damping capacity and creep resistance. (Edited author abstract) 12 Refs.

关键词： Zinc alloys

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