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Dynamic Mechanical Relaxation in Bulk Metallic Glasses:A Review

Journal of Materials Science & Technology 2014年第6期30卷 523-545页

作者： J.C.Qiao J.M.Pelletier Université de Lyon CNRS France INSA-Lyon MATEIS UMR5510 F-69621 Villeurbanne France

Metallic glasses have aroused considerable interest in the past decades because they exhibit fascinating properties. First, this article briefly outlines the mechanical, thermal properties and application of the metallic glasses. In addition, we focus on the dynamic mechanical relaxation behaviors, i.e. main （α） and secondary （β） relaxations, in metallic glasses. The mechanical relaxation behaviors are connected to the mechanical properties and physical properties in glassy materials. The main relaxation in glassy materials is related to the glass transition phenomenon and viscous flow. On the other hand, the β relaxation is linked to many fundamental issues in metallic glasses. In these materials relaxation processes are directly related to the plastic deformation mechanism. The mechanical relaxations, particularly, the β relaxation provides an excellent opportunity to design metallic glasses with desired physical and mechanical properties. We demonstrate the universal characteristics of main relaxation in metallic glasses. The phenomenological models and the physical theories are introduced to describe the main relaxation in metallic glasses. In parallel, we show the dependence of the α. and β relaxations on the thermal treatments in metallic glasses. Finally, we analyze the correlation between the atomic mobility and the thermo-mechanical treatments in metallic glasses. On the one hand, the atomic mobility in metallic glasses is reduced by physical aging or crystallization. On the other hand, the atomic mobility in metallic glass is enhanced by deformation （i.e. compression and cold rolling）. Importantly, to analyze the atomic mobility in amorphous materials, a physical theory is introduced. This model invokes the concept of quasi-point defects, which correspond to the density fluctuations in the glassy materials.

关键词： Metallic glasses Mechanical properties Main relaxation Secondary relaxation Physical analysis

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Site dependence of surface dislocation nucleation in ceramic nanoparticles

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npj Computational Materials 2021年第1期7卷 564-570页

作者： Jonathan Amodeo Emile Maras David Rodney Univ Lyon CNRSINSA LyonUCBLMATEISUMR5510VilleurbanneFrance Universitéde Lyon UniversitéClaude Bernard Lyon 1CNRSInstitut Lumière MatièreVilleurbanneFrance

The extremely elevated strength of nanoceramics under compression arises from the necessity to nucleate highly energetic dislocations from the surface,in samples that are too small to contain pre-existing ***,we investigate the site dependence of surface dislocation nucleation in MgO nanocubes using a combination of molecular dynamics simulations,nudgedelastic-band method calculations and rate theory *** an original simulation setup,we obtain a complete mapping of the potential dislocation nucleation sites on the surface of the nanoparticle and find that,already at intermediate temperature,not only nanoparticle corners are favorable nucleation sites,but also the edges and even regions on the side surfaces,while other locations are intrinsically *** are discussed in the context of recent in situ TEM experiments,sheding new lights on the deformation mechanisms happening during ceramic nanopowder compaction and sintering processes.

关键词： deformation dislocation ceramic

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XEN gel stent: a total delayed-onset postoperative hyphema

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International Journal of Ophthalmology(English edition) 2019年第7期12卷 1224-1226页

作者： Amina Rezkallah Thibaud Mathis Philippe Denis Laurent Kodjikian Department of Ophthalmology Croix-Rousse University Hospital University of Lyon Lyon 69004 France UMR-CNRS 5510 mateis University of Medicine Lyon1 Lyon 69008France

Dear Editor,Minimally invasive glaucoma surgery (MIGS) is a lessinvasive surgical alternative to filtering surgery for reducing intraocular pressure (IOP). This technique has been shown to offer long-term outcomes equivalent to filtering surgery[1]. The XEN gel implant (Allergan Inc., CA, USA) is one of MIGS procedures. This implant consists of a 6-mm tube of collagen-derived gelatin cross-linked with glutaraldehyde, preloaded in an injector.

关键词： Minimally invasive glaucoma surgery(MIGS) lessinvasive surgical alternative reducing intraocular pressure(IOP)

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Modeling and numerical investigation of slow crack growth and crack arrest in ceramic polycrystals

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Theoretical & Applied Mechanics Letters 2013年第5期3卷 53-57页

作者： Bassem El Zoghbi Rafael Estevez Christian Olagnon Laboratoire SIMAP UMR CNRS 5266 Grenoble-INP UJF Universite' de Grenoble Laboratoire mateis UMR CNRS 5510 INSA Lyon Universite' de Lyon69621 France

ntergranular slow crack growth in zirconia polycrystal is described with a cohesive zone model that simulate mechanically the reaction-rupture mechanism underlying stress and environ- mentally assisted failure. A 2D polycrystal is considered with cohesive surfaces inserted along the grain boundaries. The anisotropic elastic modulus and grain-to-grain misorientation are accounted for together with an initial stress state related to the processing. A minimum load threshold is shown to originate from the onset of the reaction-rupture mechanism to proceed where a minimum traction is reached locally and from the magnitude of the initial compression stresses. This work aims at providing reliable predictions in long lasting applications of ceramics.

关键词： zirconia ceramic slow crack growth cohesive zone intergranular failure

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Mechanical Relaxation of a Ti36.2Zr30.3Cu8.3Fe4Be21.2 Bulk Metallic Glass: Experiments and Theoretical Analysis

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 726-732页

作者： J.C.Qiao Y.H.Chen G.J.Lyu K.K.Song J.M.Pelletier Y.Yao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China School of Mechanical Electrical and Information EngineeringShandong University(Weihai)Weihai 264209China mateis UMR CNRS5510Bat.B.PascalINSA-LyonUniversite de Lyon69621 Villeurbanne CedexFrance

The dynamic mechanical relaxation behavior of Ti36.2Zr30.3Cu8.3Fe4Be21.2 bulk metallic glass with good glass-forming ability was investigated by mechanical *** mechanical relaxation behavior was analyzed in the framework of quasi-point defects *** experimental results demonstrate that the atomic mobility of the metallic glass is closely associated with the correlation factorχ.The physical aging below the glass transition temperature T g shows a non-Debye relaxation behavior,which could be well described by stretched Kohlrausch exponential *** Kohlrausch exponentβaging reflects the dynamic heterogeneities of the metallic *** concentration of"defects"and atomic mobility decrease caused by the in situ successive heating during the mechanical spectroscopy experiments.

关键词： Metallic glasses Mechanical relaxation Physical aging Quasi-point defects

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Isochronal and isothermal crystallization in Zr_(55)Cu_(30)Ni_5Al_(10) bulk metallic glass

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Transactions of Nonferrous Metals Society of China 2012年第3期22卷 577-584页

作者： J.C.QIAO J.M.PELLETIER Université de Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621 Villeurbanne cedexFrance

Non-isothermal crystallization transformation kinetics and isothermal crystallization kinetics in super-cooled liquid region（SLR） in Zr55Cu30Ni5Al10 bulk metallic glasses were studied by differential scanning calorimetry（DSC） and X-ray diffraction（XRD）.In isochronal mode,the average values of activation energy in Zr55Cu30Ni5Al10 bulk metallic glass determined by different models（Kissinger method,Flynn-Wall-Ozawa method and Augis-Bennett method） are in good agreement with each *** addition,the isothermal transformation kinetics in Zr55Cu30Ni5Al10 bulk metallic glasses was described by the Johnson-Mehl-Avrami（JMA） *** Zr55Cu30Ni5Al10 bulk metallic glass,the Avrami exponent n ranges from 2.2 to 2.9,indicating that crystallization mechanism in the bulk metallic glass was mainly diffusion-controlled;crystal growth is controlled by long range ordering diffusion in three-dimensional growth during isothermal crystallization *** average value of activation energy in Zr55Cu30Ni5Al10 bulk metallic glass is 469 kJ/mol in isothermal transformation process.

关键词： Zr55Cu30Ni5Al10 metallic glass thermal analysis crystallization kinetics Avrami exponent

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Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

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Science China(Physics,Mechanics & Astronomy) 2021年

作者： LangTingZhang YaJuanDuan DanielCrespo EloiPineda YunJiangWang Jean-MarcPelletier JiChaoQiao SchoolofMechanics CivilEngineeringandArchitectureNorthwesternPolytechnicalUniversity DepartmentofPhysics BarcelonaResearchCenterinMultiscaleScienceandTechnologyInstituteofEnergyTechnologiesUniversitatPolitècnicadeCatalunya StateKeyLaboratoryofNonlinearMechanics InstituteofMechanicsChineseAcademyofSciences SchoolofEngineeringScience UniversityofChineseAcademyofSciences mateis UMRCNRS5510UniversitédeLyonINSA-Lyon

Dynamic mechanical relaxation is a fundamental tool to understand the mechanical and physical properties of viscoelastic materials like glasses. Mechanical spectroscopy shows that the high-entropy bulk metallic glass(La30Ce30Ni10Al20Co10) exhibits a distinct β-relaxation feature. In the present research, dynamic mechanical analysis and thermal creep were performed using this bulk metallic glass material at a temperature domain around the β relaxation. The components of total strain, including ideal elastic strain, anelastic strain, and viscous-plastic strain, were analyzed based on the model of shear transformation zones（STZs）.The stochastic activation of STZ contributes to the anelastic strain. When the temperature or external stress is high enough or the timescale is long enough, the interaction between STZs induces viscous-plastic strain. When all the spectrum of STZs is activated, the quasi-steady-state creep is achieved.

关键词： high-entropy bulk metallic glass mechanical relaxation creep recovery process shear transformation zone structural heterogeneity

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Plasmonic-enhanced two-photon fluorescence with single gold nanoshell

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Science China(Physics,Mechanics & Astronomy) 2014年第6期57卷 1038-1045页

作者： ZHANG TianYue LU GuoWei SHEN HongMing Perriat P Martini M Tillement O GONG QiHuang State Key Laboratory for Mesoscopic Physics Department of PhysicsPeking University Matériaux Ingénierie et Sciences (MATEIS)UMR 5510 CNRSINSA-LyonUniversité de Lyon CNRS Laboratory of Physio-Chemistry of Luminescent Materials Université de Lyon Université Claude Bernard Collaborative Innovation Center of Quantum Matter

Single gold nanoshell with mutilpolar plasmon resonances is proposed to enhance two-photon fluorescence *** single emitter single nanoshell configuration is studied systematically by employing the finite-difference time-domain *** emitter located inside or outside the nanoshell at various positions leads to a significantly different enhancement *** fluorescent emitter placed outside the nanoshell can achieve large fluorescence intensity given that both the position and orientation of the emission dipole are optimally *** contrast,for the case of the emitter placed inside the nanoshell,it can experience substantial two-photon fluorescence enhancement without strict requirements upon the position and dipole *** nanoshell encapsulating many fluorescent emitters should be a promising nanocomposite configuration for bright two-photon fluorescence *** results provide a comprehensive understanding about the plasmonic-enhanced two-photon fluorescence behaviors,and the nanocomposite configuration has great potential for optical detecting,imaging and sensing in biological applications.

关键词： surface plasmon resonances two-photon fluorescence finite-difference time-domain

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Main α relaxation and slow β relaxation processes in a La30Ce30Al15Co25 metallic glass

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Journal of Materials Science & Technology 2019年第6期35卷 982-986页

作者： J.C. Qiao Y.H. Chen R. Casalini J.M. Pelletier Y. Yao School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi'an 710072 China Chemistry Division Naval Research Laboratory Code 6120 Washington DC 20375-5342 United States Universite de Lyon MATEIS UMR CNRS5510 Bat. B. Pascal INSA-Lyon F-69621 Villeurbanne cedex France

Dynamic relaxation processes are fundamental to understand the mechanical and physical properties of metallic glasses. In the current work, mechanical relaxations in a La30Ce30Al15Co25 bulk metallic glass were probed by dynamic mechanical analysis. In contrast to many metallic glasses, La30Ce30Al15Co25 metallic glass shows a pronounced slow β relaxation peak. Physical aging below the glass transition temperature Tgleads to an increase of the apparent activation energy and a decrease of the slow β relaxation magnitude. The correlation between the slow β relaxation and the main α relaxation is discussed.

关键词： Mechanical relaxation Dynamic mechanical relaxation α Relaxation β relaxation Physical aging

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Using machine learning and a data-driven approach to identify the small fatigue crack driving force in polycrystalline materials

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npj Computational Materials 2018年第1期4卷 363-372页

作者： Andrea Rovinelli Michael D.Sangid Henry Proudhon Wolfgang Ludwig School of Aeronautics and Astronautics Purdue University701W.Stadium AveWest LafayetteIN 47907USA MINES ParisTech PSL Research UniversityMAT-Centre des matériauxCNRS UMR 7633BP 8791003 EvryFrance University of Lyon INSA LyonMATEISUMR 5510 CNRSF-69621 LYONFrance

The propagation of small cracks contributes to the majority of the fatigue lifetime for structural *** significant interest,criteria for the growth of small cracks,in terms of the direction and speed of crack advancement,have not yet been *** this work,a new approach to identify the microstructurally small fatigue crack driving force is *** network and machine learning techniques are utilized to identify relevant micromechanical and microstructural variables that influence the direction and rate of the fatigue crack propagation.A multimodal dataset,combining results from a high-resolution 4D experiment of a small crack propagating in situ within a polycrystalline aggregate and crystal plasticity simulations,is used to provide training *** relevant variables form the basis for analytical expressions thus representing the small crack driving force in terms of a direction and a rate *** ability of the proposed expressions to capture the observed experimental behavior is quantified and compared to the results directly from the Bayesian network and from fatigue metrics that are common in the *** indicate that the direction of small crack propagation can be reliably predicted using the proposed analytical model and compares more favorably than other fatigue metrics.

关键词： fatigue crack driving

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