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Inhomogeneous dealloying kinetics along grain boundaries during liquid metal dealloying

Journal of Materials Science & technology 2022年第11期106卷 41-48页

作者： S.-H.Joo Y.B.Jeong t.wada I.V.Okulov H.Kato Department of Materials Science and Engineering Dankook University119 Dandae-roCheonan 31116Korea Institute for Materials Research Tohoku UniversityKatahira 2-1-1Sendai 980-8577Japan Institute of Natural Sciences and Mathematics Ural Federal University620000 EkaterinburgRussia Faculty of Production Engineering University of BremenBadgasteiner Str.128359 BremenGermany Leibniz Institute for Materials Engineering-IWt Badgasteiner Str.328359 BremenGermany

In this study, the inhomogeneous dealloying phenomenon during the liquid metal dealloying(LMD) was investigated using FeNi+Mg and(FeCo)Ni+Mg systems. For the FeNi+Mg system, the inhomogeneous dealloying and wetting of Mg melt occurred along triple junction(tJ) and grain boundary(GB).temperature increase enhances the inhomogeneous dealloying kinetics and leads to the formation of the plate-shaped abnormal ligaments at the GB region. the energy banlance between a GB energy(γGB)and solid-liquid interface energies(γsl) is the key factor governing the inhomogeneous dealloying and wetting. Particularly, the low-energy twin boundaries were unaffected by the inhomogeneous dealloying.therefore, precursor microstructure is an important factor determining the final morphology of dealloyed material as well as its physical properties. In the case of the(FeCo)Niprecursor, all tJ and GB were stable against the preferred penetration of Mg melt from 600 ℃ to 800 ℃. It was concluded that a minor addition of alloying elements(VorCr) changes GB characteristics as well as γslof the precursor alloy.Consequently, this significantly influences dealloying mechanisms and final morphology of the dealloyed material. the current findings demonstrate the importance of GB engineering in the precursor materials for the technological application of liquid metal dealloying for the synthesis of advanced structural and functional materials.

关键词： Liquid metal dealloying Inhomogeneous dealloying Dealloying mechanism Abnormal ligament Porous material

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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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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 properties.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 was investigated by dynamic mechanical analysis(DMA)and the mechanical spectra could be well described by the quasi-point defects(QPD)theory.Compared 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 diffusion.At the same time,the correlation factor is higher than that of conventional metallic glasses and this is ascribed to the high configuration entropy.In 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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Dispersion of Ultrafast Optical Kerr Effect in No-aggregation Phthalocyanine Molecules

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Chinese Physics Letters 1997年第2期14卷 96-99页

作者：龚旗煌 t.Isoshima M.Q.tian t.wada H.Sasabe Department of Physics Mesoscopic Physics LaboratoryPeking UniversityBeijing 100871 Frontier Research Program Institute of Physical and Chemical Research(RIKEN)WakoSaitama 351-01Japan

We report dispersion property for femtosecond optical Kerr effect in the solutions of no-aggregation 16(trifluoro ethoxy1)vanadyl phthalocyanine in the wavelength range of 850-770 nm.the optical Kerr effect spectrum s... 详细信息

关键词： optical Dispersion effect

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渗碳过程的扩散模型

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热处理技术与装备 1982年第2期 25-26+24页

作者： t.wada 符仁钰上海工业大学

Goldstein和Moren曾发表过一篇关于钢在渗碳过程中的扩散模型的详细的研究报告。遗憾的是他们的文章中显然地误用了浓度单位,并且文中的图9到图14是值得商榷的(参考文献1),本文试图对参考文献1所用的一些参数作一些修正。

关键词：渗碳过程方程参考文献百分数表面碳浓度合金系碳浓度分布热力学参数扩散模型经济模型

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对非手术治疗IPMN病人的胰腺癌发生率、疾病特异性死亡率和全因死亡率的研究——长期队列研究

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国际医学放射学杂志 2016年第2期 181-182页

作者： N.Nagata A.Kawazoe S.Mishima t.wada t.Shimbo K.Sekine 郑丽 Department of Gastroenterology and Hepatology National Center for Global Health and Medicine

摘要目的研究胰导管内乳头状黏液性肿瘤(IPMN)病人发生胰腺癌的累积发病率、疾病特异性死亡率和全因死亡率,并探究与之相关的影像表现。材料与方法该回顾性研究已通过伦理委员会审批,所有受检者均已签署知情同意书。数据主要来源于电子... 详细信息

摘要目的研究胰导管内乳头状黏液性肿瘤(IPMN)病人发生胰腺癌的累积发病率、疾病特异性死亡率和全因死亡率,并探究与之相关的影像表现。材料与方法该回顾性研究已通过伦理委员会审批,所有受检者均已签署知情同意书。数据主要来源于电子数据库,部分来源于数据表,此研究共纳入258例非手术治疗的IPMN病人,病人均通过影像检查定期随访(其中多层Ct检查1 273次,MR胆胰管成像检查

关键词： IPMN 胰腺癌 MD 胰腺肿瘤全因死亡特异性囊性病灶死亡率非手术治疗疾病病人

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日本结核分枝杆菌北京家族株的系统发生学与基因学特征

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国际结核病与肺部疾病杂志 2011年第2期6卷 91-94页

作者： S.Maeda t.wada t.Iwamoto Y.Murase S.Mitarai I.Sugawara S.Kato 姜广路刘宇红 the Research Institute of tuberculosis Japan Anti-Tuberculosis Association Department of Microbiology Osaka City Institute of Public Health and Environmental Sciences partment of Microbiology Kobe Institute of Health

为评价目前在日本流行的结核分枝杆菌的基因结构特征,对从全日本结核病患者中分离到的237株北京家族株进行了系统发生学的研究。与之前来自于其他国家的报道不同,古老亚型菌株是日本的主要流行株。成簇分析建立在JAtA-VNtR(日本防痨协... 详细信息

为评价目前在日本流行的结核分枝杆菌的基因结构特征,对从全日本结核病患者中分离到的237株北京家族株进行了系统发生学的研究。与之前来自于其他国家的报道不同,古老亚型菌株是日本的主要流行株。成簇分析建立在JAtA-VNtR(日本防痨协会随机重复序列的可变数目)的基础上,这种方法可以描述日本结核分枝杆菌菌株的独特的VNtR方法,结果揭示了现代亚型菌株间没有地域来源的区别,具有高度的相似性。JAtA-VNtR方法可能对在经常分离出古老亚型菌株的菌群中进行系统发生学研究是有价值的。

关键词：结核分支杆菌北京家族株 VNtR 系统发生学

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生物技术在渔业上的应用

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湖南水产 1989年第2期 40-41,26页

作者： Katsuhiko t.wada 罗闰良

1、引言生物技术能以许多方式应用于渔业。这也许是因为我们利用多类渔业产品．因为生物技术有一个非常广泛的范围。如果我们将生物技术定义为用工程学方法控制生物尤其它们的细胞的特性，并利用这些特性的技术—譬如在繁殖过程中的生... 详细信息

1、引言生物技术能以许多方式应用于渔业。这也许是因为我们利用多类渔业产品．因为生物技术有一个非常广泛的范围。如果我们将生物技术定义为用工程学方法控制生物尤其它们的细胞的特性，并利用这些特性的技术—譬如在繁殖过程中的生物类型的控制和取自活体细胞的培养．我们就能预期生物技术以大量方式应用于渔业的可能性．

关键词：生物技术渔业三倍体雌核发育组织培养

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Late Ordovician Mass Extinction: Earth, fire and ice

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National Science Review 2024年第1期11卷 51-65页

作者： David A.t.Harper Palaeoecosystems Group Department of Earth SciencesDurham University

the Late Ordovician Mass Extinction was the earliest of the ‘big’ five extinction events and the earliest to affect the trajectory of metazoan life. two phases have been identified near the start of the Hirnantian period and in the middle. It was a massive taxonomic extinction, a weak phylogenetic extinction and a relatively benign ecological extinction. A rapid cooling, triggering a major ice age that reduced the temperature of surface waters, prompted a drop in sea level of some 100 m and introduced toxic bottom waters onto the shelves. these symptoms of more fundamental planetary processes have been associated with a range of factors with an underlying driver identified as volcanicity. Volcanic eruptions, and other products, may have extended back in time to at least the Sandbian and early Katian, suggesting the extinctions were more protracted and influential than hitherto documented.

关键词： Ordovician LOME paleoecology palaeobiogeography biotas

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Preparation of microparticles and nanoparticles using membrane-assisted dispersion,micromixing,and evaporation processes

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Particuology 2024年第1期84卷 30-44页

作者： Goran t.Vladisavljevic Chemical Engineering Department Loughborough UniversityLoughboroughLeicestershire LE113TUUnited Kingdom

Synthetic microporous membranes are increasingly used for energy-efficient and controlled production of micro-and nanoparticles and micro-and nanoemulsions with tuneable morphology and physico-chemical properties through various micromixing,emulsification,and evaporation processes.In emul-sification processes,the membrane pores are used for dispersed phase injection and size-controlled generation of droplets and droplet-templated particles.In micromixing processes,membrane is utilised as a micromixer for mixing two miscible liquids,usually solvent and antisolvent-rich solutions,which leads to the creation of supersaturation and subsequent nanoprecipitation or crystallisation.In mem-brane evaporation processes,membrane is used to prevent phase dispersion while allowing efficient molecular diffusion of solvent and/or antisolvent vapour through gas-filled pores.Membrane dispersion processes can be operated continuously by decoupling shear stress on the membrane surface from cross flow using tube insets,flow pulsations,swirling flow,membrane oscillations or membrane rotations.Droplet generation and solidification can be performed continuously in a single pass by connecting membrane module with a downstream reactor.Membrane dispersion processes can be used for pro-duction of nanoparticles such as nanovesicles(liposomes,micelles,ethosomes,and niosomes),nanogels,polymeric,lipid and metallic nanoparticles,and nanocrystals.the main advantages of membrane-assisted particle generation are in low energy consumption,controlled geometry and hydrodynamic conditions at the microscale level,flexible throughput due to modular and scalable design of membrane devices,and a wide choice of available microporous membranes with various wall porosities,wetta-bilities,pore sizes,and pore morphologies to suit different applications.

关键词： Nanoparticles Microparticles Nanoemulsions Microemulsions Microporous membrane Crystallisation Flash nanoprecipitation Emulsification Zero liquid discharge

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