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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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Homogeneous Plastic Flow of Fully Amorphous and Partially Crystallized Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) Bulk metallic Glass

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journal of materials Science & Technology 2003年第6期19卷 557-560页

作者： Q.WANG j.j.Blandin m.Suery B.Van de moortele j.m.pelletier GPm2 ENSPG D.U. B.P.46 38042 Grenoble France Institute of Materials Shanghai University Shanghai 200072 ChinaGPM2 ENSPG D.U. B.P.46 38042 Grenoble FranceGPM2 ENSPG D.U. B.P.46 38042 Grenoble FranceGEMPPM Bat. B. PascalINSA 69621 Villeurbanne Cedex FranceGEMPPM Bat. B. PascalINSA 69621 Villeurbanne Cedex France

The homogeneous plastic flow of fully amorphous and partially crystallized Zr(41.2)Ti(13.8)Cu(12.5)Ni(10)Be(22.5) bulk metallic glass (Vitl) has been investigated by compression tests at high temperatures in supercooled liquid region. Experimental results show that at sufficiently low strain rates, the supercooled liquid of the fully amorphous alloy reveals Newtonian flow with a linear relationship between the flow stress and strain rate. As the strain rate is increased, a transition from linear Newtonian to nonlinear flow is detected, which can be explained by the transition state theory. Over the entire strain rate interval investigated, however, only nonlinear flow is present in the partially crystallized alloy, and the flow stress for each strain rate is much higher. It is found that the strain rate-stress relationship for the partially crystaltized alloy at the given temperature of 646 K also obeys the sinh law derived from the transition state theory, similar to that of the initial homogeneous amorphous alloy. Thus, it is proposed that the flow behavior of the nanocrystalline/amorphous composite at 646 K is mainly controlled by the viscous flow of the remaining supercooled liquid.

关键词： Homogeneous plastic flow Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloy,Partially crystallized amorphous alloy

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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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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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Influence of high configuration entropy on damping behaviors of Ti-Zr-Hf-Ni-Co-Cu high entropy alloys

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journal of materials Science & Technology 2023年第22期153卷 242-253页

作者： W.Q.Wu L.Zhang K.K.Song j.m.pelletier H.F.Zhang j.C.Qiao School of mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China Shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of mechanical and Electrical Engineering Shandong UniversityWeihai 264209China Universitéde Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonVilleurbanne Cedex F-69621France Chongqing Science and Technology Innovation Center of NPU Chongqing 401135China

TiNi-based shape memory alloys(SmAs)have been used as damping materials to eliminate noise and mechanical ***,their application is limited by low working temperatures and damping *** this work,two novel Ti-Zr-Hf-Ni-Co-Cu high entropy shape memory alloys(HESmAs)with different transformation temperatures and damping properties were *** results show that Ti_(25)Zr_(8)Hf_(17)Ni_(30)Co_(5)Cu_(15) has superior damping performance arising from martensitic transformation,shape memory effect(thermal cycle at constant load)as well as *** to traditional TiNi-based SmAs,the as-cast HESmAs exhibit a much higher ultrahigh yield strength(∼2 GPa)and storage modulus(∼50 GPa).The high configuration entropy of the HESmAs with high uneven internal stress and severe lattice distortion is revealed as the underlying mechanisms governing distinctive damping *** effects of high configuration entropy and microheterogeneity on the martensitic transforma-tion behavior and damping performance of HESmAs are clarified in this work,which provides a basis for designing alloys with superior damping properties.

关键词： High entropy s hape memory alloy Internal friction Damping Configuration entropy martensitic transformation

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Dynamic mechanical relaxation behavior of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass

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journal of materials Science & Technology 2021年第24期83卷 248-255页

作者： L.T.Zhang Y.j.Duan T.Wada H.Kato j.m.pelletier D.Crespo E.Pineda j.C.Qiao School of mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China Institute for materials Research Tohoku UniversitySendai980-8577Japan Universitéde Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621Villeurbanne CedexFrance Department of Physics Barcelona Research Center in Multiscale Science and TechnologyInstitute of Energy TechnologiesUniversitat Politècnica de Catalunya08019BarcelonaSpain

Non-equiatomic high entropy bulk metallic glasses were reported recently and show unique mechanical and physical *** mechanical relaxation behavior of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass was investigated by dynamic mechanical analysis(DmA)and the mechanical spectra could be well described by the quasi-point defects(QPD)*** to typical metallic glasses,the intensity of theβrelaxation of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass is lower due to the sluggish *** the same time,the correlation factor is higher than that of conventional metallic glasses and this is ascribed to the high configuration *** parallel,physical aging below the glass transition temperature leads to a decrease of atomic mobility,caused by a decrease of the concentration of defects.

关键词： High entropy bulk metallic glass mechanical relaxation Quasi-point defects Physical aging

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Analysis of the anelastic deformation of high-entropy Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) metallic glass under stress relaxation and recovery

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journal of materials Science & Technology 2022年第12期107卷 82-91页

作者： Y.j.Duan L.T.Zhang T.Wada H.Kato E.Pineda D.Crespo j.m.pelletier j.C.Qiao School of mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China Department of Physics Institute of Energy TechnologiesUniversitat Politècnica de CatalunyaBarcelona 08019Spain Institute for materials Research Tohoku UniversitySendai 980-8577Japan Universitéde Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621 Villeurbanne CedexFrance

The anelastic deformation behavior of Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) high-entropy metallic glass was probed by monitoring the stress relaxation and recovery processes. The stress relaxation under consecutive strain steps can be described by the Kohlrausch-Williams-Watts(KWW) function. In addition, considering a hierarchy of relaxation processes related to the structural heterogeneity, a constitutive model is proposed in order to describe the whole process of stress relaxation and determine the contribution of different time scales. moreover, a crossover from stochastic activation to percolation of flow defects with the ultimate strain can be observed during stress relaxation process. The anelastic recovery process after a strain step is studied as a function of the initial strain level and characterized by means of a direct spectrum analysis. The peaks in the recovery time-spectra revealed the evolution of flow defects in Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) high-entropy metallic glass. The understanding of the atomic free-volume zones effect and the anelastic deformation provides important insight into how atomic structural features affect the deformation behavior of high-entropy metallic glasses, and may provide a new avenue into the improvement of their mechanical properties.

关键词： High-entropy metallic glass Stress relaxation Anelastic deformation Flow defects Free-volume zones

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激光表面涂敷时,喷粉微粒在基底表面的分布

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昆明工学院学报 1992年第6期17卷 68-73页

作者：任恩扬 j.m.pelletier 昆明工学院激光研究室法国里昂应用科技学院

在激光表面涂敷技术中,一种方法是用气体运载金属和陶瓷粉末从激光输出口喷出,溶化后在基底表面形成覆盖层.喷出的粉状微粒在基底表面上的分布情况对涂敷的质量有很大的影响.本文从理论上研究了被运载的粉状材料从圆形喷口喷出后的运动... 详细信息

在激光表面涂敷技术中,一种方法是用气体运载金属和陶瓷粉末从激光输出口喷出,溶化后在基底表面形成覆盖层.喷出的粉状微粒在基底表面上的分布情况对涂敷的质量有很大的影响.本文从理论上研究了被运载的粉状材料从圆形喷口喷出后的运动情况,得到了在管口下方的基底材料表面上的分布形式,与实验的结果基本符合.这对提高激光表面涂敷的质量,从实验上改进喷粉微粒在基底表面的分布形式提供了参考依据.

关键词：激光涂敷微粒表面材料

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Unexpected non-monotonic changing in the heterogeneity of glasses during annealing

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journal of materials Science & Technology 2024年第10期177卷 96-102页

作者： Yu Tong Fucheng Li Lijian Song Yanhui Liu juntao Huo jichao Qiao Yao Yao jmpelletier Daniel Crespo Eloi Pineda jun-Qiang Wang CAS Key Laboratory of magnetic materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Institute of Physics Chinese Academy of SciencesBeijing 100190China School of mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China mateis UMR CNRS5510INSA-LyonUniversitéde LyonVilleurbanne cedex F-69621France Department of Physics Institute of Energy TechnologiesUniversitat Politècnica de CatalunyaBarcelona 08019Spain

The heterogeneity of glasses has critical influences on the *** heterogeneity evolves during annealing is an intriguing cutting-edge *** this work,the heterogeneity of the annealed metal-lic and polymer glasses has been studied systematically by using stress relaxation and nanoindentation *** stress relaxation processes are analyzed using Kohlrausch-Williams-Watts(KWW)*** surprisingly find that the heterogeneous factor βkww in KWW equation does not change monotonously but increases first and then decreases along with the annealing *** two-stage process implies that glasses do not evolve as expected toward the more homogeneous glassy state but become homogeneous first and then more *** is further verified by the evolution of critical shear stress for local *** is revealed that the two-stage process is correlated with different relaxation modes,which is further interpreted using a phenomenological *** findings not only give insights into understanding the nature of glasses,but also are useful for designing glasses with superior properties.

关键词： Glasses Heterogeneity Aging Relaxation

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Brain-penetrating neurotrophic factor mimetics: HER-096 as a disease-modifying therapy for Parkinson’s disease

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Neural Regeneration Research 2025年第4期20卷 1094-1095页

作者： Natalia Kulesskaya Kira m.Holmström Henri j.Huttunen Herantis Pharma Plc EspooFinland

Neurotrophic factors as a therapeutic approach in neurodegenerative diseases:A major unmet need in the field of central nervous system diseases is disease-modifying *** for decades there have been various symptomatic treatments available to alleviate the symptoms of the disease,disease-modification,*** that stop,significantly delay,or reverse the progression of the disease,has been turned out to a difficult goal to achieve.

关键词： diseases treatment therapeutic

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