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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

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

MARtENSItE-lIKE PHASE tRANSItIONS DUE tO POlAR REGION StRUCtURE IN DISORDERED FERROElECtRIC CERAMICS

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Acta Metallurgica Sinica(English letters) 1999年第5期12卷 1099-1105页

作者： H.Q.Fan and l.t.zhang State Key lab. of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Clear experimental evidence for phase transitions was shown in titanium doped lead magnesium niobate compositional disordered ferroelectric ceramics. One is the diffused phase transition around the temperature of dielectric permittivity maxima, which is often assumed as the characteristics of relaxor ferroelectrics. Another is a first order transition from frequency dispersion relaxor ferroelectrics to normal ferroelectrics, corresponding to a zero field spontaneous polar micro macrodomain switching. According to the x ray diffraction, thermal analysis and transmission electron microscope results, it is pointed out that the relaxor state corresponds to a coexistence of cubic parent phase and nucleating rhombohedral ferroelectric microregion which is similar to a precursor martensite. After the spontaneous relaxor normal ferroelectrics transition, the lower symmetry phase is sure to be a long range rhombohedral phase. thus a dynamic behavior of polar microregions is suggested to explain the phenomena, which is more similar to a stress induced martensitic transformations from cubical stabilized perovskite parent phase.

关键词： lead magnesium niobate relaxor ferroelectric ceramics polar microregion martensitic transformation

StUDY ON C-FIBER-REINFORCED CElSIAN-MAtRIX COMPOSItES

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Acta Metallurgica Sinica(English letters) 1999年第5期12卷 1094-1098页

作者： X.W.Yin, l.F.Cheng,l.t.zhang, W.C.Zhou and Y.D.Xu State Key laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an 710072, China

Strong, tough, and almost fully dense C fiber reinforced celsian matrix composites have been fabricated by impregnation of the fiber tows with the matrix slurry, winding on a drum, drying, stacking the prepreg tapes in the desired orientation, and hot pressing. the monoclinic celsian phase in the matrix was produced in situ, during hot pressing, from amphosous BAS. the unidirectional composites having ≈20 vol% of fibers exhibited graceful failure with extensive fiber pullout in three point bend tests at room temperature. Values of ultimate flexural strength and fracture toughness were 379MPa and 8 3MPa·m 1/2 , respectively.

关键词： barium aluminosilicate celsian composite sol gel carbon fiber

Magnetosymbiosis discovery:new perspectives in magnetotaxis research

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Journal of Oceanology and limnology 2025年第1期43卷 177-186页

作者： Caroline l.MONtEIl Christopher t.lEFEVRE Aix-Marseille Université CEACNRSInstitute of Biosciences and Biotechnologies of Aix-MarseilleSaint-Paul-lez-Durance 13115France

Magnetotactic bacteria have been the only known magnetoreceptive microorganisms for *** if the existence of magnetotactic protists was suggested in 1986,this is only 30 years later that magnetotaxis was extended to the domain of Eukaryota,thanks to the characterization of magnetotactic symbiotic assemblies composed of a flagellated protist and bacteria biomineralizing magnetic *** mutualistic ectosymbiosis relies on a collective magnetotaxis coupled to a hydrogen-based *** new form of cooperation challenges our view of magnetic biomineralization in prokaryotes and magnetoreception in *** this review,we present how magnetosymbiosis was discovered and how cooperation ***,we discuss the future research and the new perspectives such discovery brought to the field of magnetotaxis.

关键词： magnetotaxis biomineralization symbiosis magnetotactic

Unveiling solid-solid contact states in all-solid-state lithium batteries:An electrochemical impedance spectroscopy viewpoint

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Journal of Energy Chemistry 2025年第2期101卷 16-22页

作者： Jin-liang li liang Shen Zi-Ning Cheng Jun-Dong zhang ling-Xuan li Yu-tong zhang Yan-Bin Gao Chunli Guo Xiang Chen Chen-Zi Zhao Rui zhang Qiang zhang tsinghua Center for Green Chemical Engineering Electrification Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University College of Materials Science and Engineering Taiyuan University of Technology Advanced Research Institute of Multidisciplinary Science School of Materials Science and Engineering Beijing Institute of Technology Beijing Huairou laboratory Institute for Carbon Neutrality Tsinghua University Shanxi Research Institute for Clean Energy Tsinghua University

All-solid-state lithium batteries（ASSlBs） are strongly considered as the next-generation energy storage devices for their high energy density and intrinsic *** solid-solid contact between lithium metal and solid electrolyte plays a vital role in the performance of working ASSlBs,which is challenging to investigate quantitatively by experimental *** work proposed a quantitative model based on the finite element method for electrochemical impedance spectroscopy simulation of different solid-solid contact states in *** the assistance of an equivalent circuit model and distribution of relaxation times,it is discovered that as the number of voids and the sharpness of cracks increase,the contact resistance Rcgrows and ultimately dominates the battery *** accurate fitting,inverse proportional relations between contact resistance Rcand（1-porosity） as well as crack angle was *** contribution affords a fresh insight into clarifying solid-solid contact states in ASSlBs.

关键词： All-solid-state lithium batteries Distribution of relaxation times Electrochemical impedance spectroscopy Equivalent circuit model Finite element method Solid-solid contacts

Орtimizing struсturаl раrаmеtеrs оf еlесtrоwеtting triрlе-liquid lеns bаsеd оn jоint simulаtiоn tесhnоlоgy

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Chinese Optics 2025年第1期18卷 78-88页

作者： Huang, Peng Song, Yue Zhou, Fei-Qiang Zhou, Yi-Hang He, Guo-Qiang Xie, Zhong-Yi zhang, Xin-long Key laboratory of Advanced Manufacturing and Automation Тechnology in Guangхi Universities School of Mechanical and Control Engineering Guilin University of Тechnology Guilin541006 China

the electrowetting triple-liquid lens has excellent zoom performance, but its structural complexity and design difficulty are relatively high. therefore, we propose a method for optimizing the structural parameters of the electrowetting triple-liquid lens based on joint simulation. to design a triple-liquid lens, Comsol and Zemax software are used to establish triple-liquid lens simulation models under different structural parameters, and its focal lengths under different voltages are obtained. the effects of height and taper on zoom range and initial focal length are analyzed, and a set of structural parameters with the maximum zoom range and the longest initial focal length is determined. to verify the method’s reliability, we prepare the triple-liquid lens models with different heights and tapers, and conduct zoom experiments. the simulation and experimental results show that the initial focal length of the triple-liquid lens correlates positively with height and taper;the zoom range correlates positively with taper, but height is the main influencing factor. When the height is 12 mm and the taper is 20°, the lens has the most extensive zoom range and the longest initial focal length. When the taper is less than 15°, the simulation and experimental results are highly consistent. © 2025 Editorial Office of Chinese Optics. All rights reserved.

关键词： Focusing

A novel flexible nerve guidance conduit promotes nerve regeneration while providing excellent mechanical properties

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Neural Regeneration Research 2025年第7期20卷 2084-2094页

作者： tong li Quhan Cheng Jingai zhang Boxin liu Yu Shi Haoxue Wang lijie Huang Su zhang Ruixin zhang Song Wang Guangxu lu Peifu tang Zhongyang liu Kai Wang Department of Orthopedics the Fourth Medical Center of Chinese PLA General HospitalBeijingChina Department of training and Sports Medicine Characteristic Medical Center of Chinese People’s Armed Police ForceTianjinChina Medical School of Chinese PlA BeijingChina Key laboratory of Bioactive Materials for the Ministry of Education College of Life SciencesNankai UniversityTianjinChina Department of Orthopedics Tianjin HospitalTianjinChina Department of Rehabilitation Medicine Er Quan Hospital of PAPWuxiJiangsu ProvinceChina

Autografting is the gold standard for surgical repair of nerve defects>5 mm in length;however,autografting is associated with potential complications at the nerve donor *** an alternative,nerve guidance conduits may be *** ideal conduit should be flexible,resistant to kinks and lumen collapse,and provide physical cues to guide nerve *** designed a novel flexible conduit using electrospinning technology to create fibers on the innermost surface of the nerve guidance conduit and employed melt spinning to align ***,we prepared disordered electrospun fibers outside the aligned fibers and helical melt-spun fibers on the outer wall of the electrospun fiber *** presence of aligned fibers on the inner surface can promote the extension of nerve cells along the *** helical melt-spun fibers on the outer surface can enhance resistance to kinking and compression and provide *** novel conduit promoted nerve regeneration and functional recovery in a rat sciatic nerve defect model,suggesting that it has potential for clinical use in human nerve injuries.

关键词： aligned fibers anti-kinking helical fibers nerve guidance conduit nerve regeneration peripheral nerve injury topological guidance

Oxalate modification enabled advanced phosphate removal of nZVI:In Situ formed surface ternary complex and altered multi-stage adsorption process

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Journal of Environmental Sciences 2025年第3期149卷 79-87页

作者： Shiyu Cao Jiangshan li Yanbiao Shi Furong Guo tingjuan Gao lizhi zhang Key laboratory of Pesticide&Chemical Biology of Ministry of Education Institute of Environmental&Applied ChemistryCollege of ChemistryCentral China Normal UniversityWuhan 430079China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China

Nano zero-valent iron(nZVI)is a promising phosphate adsorbent for advanced phosphate ***,the rapid passivation of nZVI and the low activity of adsorption sites seriously limit its phosphate removal performance,accounting for its inapplicability to meet the emission criteria of 0.1 mg P/l *** this study,we report that the oxalate modification can inhibit the passivation of nZVI and alter the multi-stage phosphate adsorption mechanism by changing the adsorption *** expected,the stronger antipassivation ability of oxalate modified nZVI(OX-nZVI)strongly favored its phosphate ***,the oxalate modification endowed the surface Fe(III)sites with the lowest chemisorption energy and the fastest phosphate adsorption ability than the other adsorption sites,by in situ forming a Fe(III)-phosphate-oxalate ternary complex,therefore enabling an advanced phosphate removal *** an initial phosphate concentration of 1.00 mg P/l,pH of 6.0 and a dosage of 0.3 g/l of adsorbents,OX-nZVI exhibited faster phosphate removal rate(0.11 g/mg/min)and lower residual phosphate level(0.02 mg P/l)than nZVI(0.055 g/mg/min and 0.19 mg P/l).this study sheds light on the importance of site manipulation in the development of high-performance adsorbents,and offers a facile surface modification strategy to prepare superior iron-basedmaterials for advanced phosphate removal.

关键词： Oxalate modification Advanced phosphate removal Nano zero-valent iron(nZVI) Surface ternary complex Multi-stage adsorption