International audienceIn the present work, we discuss the glass-forming ability of various binary alloys in which the glassy phase was not formed even by melt spinning technique with high cooling rate of the melt up to 1 MK/s (some consisted of partly glassy phase), though by commonly accepted guidelines, these alloys could be as good glass-formers as many other binary glasses. The alloys studied belong to binary systems with multiple eutectics; the constituent elements have a negative enthalpy of mixing, and a significant variability of atomic size differences is observed from system to system. The results indicate the necessity of taking into account simultaneously various factors influencing the glass-forming ability including melt fragility
Articles you may be interested inDopant selection for control of charge carrier density and mobility in amorphous indium oxide thin-film transistors: Comparison between Si-and W-dopants Appl. Phys. Lett. 106, 042106 (2015); 10.1063/1.4907285 Unipolar resistive switching behavior of amorphous gallium oxide thin films for nonvolatile memory applications Appl. Phys. Lett. 106, 042105 (2015); 10.1063/1.4907174 Optical properties of Mn-Co-Ni-O thin films prepared by radio frequency sputtering depositionHere, we report on the properties of native and artificial oxide amorphous thin film on a surface of an amorphous Ni-Nb sample. Careful measurements of local current-voltage characteristics of the system Ni-Nb / NiNb oxide/Pt, were carried out in contact mode of an atomic force microscope. Native oxide showed n-type conductivity, while in the artificial one exhibited p-type one. The shape of current-voltage characteristic curves is unique in both cases and no analogical behavior is found in the literature. X-ray photoelectron spectroscopy (XPS) measurements were used to detect chemical composition of the oxide films and the oxidation state of the alloy components. Detailed analysis of the XPS data revealed that the structure of natural Ni-Nb oxide film consists of Ni-NbO x top layer and nickel enriched bottom layer which provides n-type conductivity. In contrast, in the artificial oxide film Nb is oxidized completely to Nb 2 O 5 , Ni atoms migrate into bulk Ni-Nb matrix. Electron depletion layer is formed at the Ni-Nb/Nb 2 O 5 interface providing ptype conductivity. V C 2015 AIP Publishing LLC. [http://dx.
Металловедение и термическая обработка Izvestiya vuzov. Tsvetnaya metallurgiya • 6 • 2016 71 Введение Металлические стекла, получаемые в виде тонких чешуек или лент, известны со второй половины прошлого века [1]. Объемные металлические стекла (ОМС) с минимальным размером порядка 100-102 мм в каждом из 3 пространственных измерений [2] изначально были получены в системах Pd-Cu-Si и Pd-Ni-P, но ввиду исключительной дороговизны основного компонента (палладия) долгое время не представляли особого интереса для ученых и инженеров. Впоследствии ОМС, полученные во многих других системах, включая технологически важные -на основе Fe, Mg, Ti и УДК: 669.017 WPI-AIMR, Университет Тохоку, Япония Национальный исследовательский технологический университет «МИСиС», г. Москва Статья поступила в редакцию 04.02.16 г., подписана в печать 12.02.16 г. За последние несколько десятилетий открыто относительно небольшое число революционных материалов в области металловедения и физики металлов, и объемные металлические стекла одни из них. Их прочность и твердость значительно выше, а модуль упругости ниже, чем кристаллических сплавов, что приводит к высокой энергии запасенной упругой деформации. Эти материалы также имеют очень хорошую устойчивость к коррозии. В настоящей работе исследованы свойства объемных металлических стекол, в частности тепловые, механические, магнитные, электрические показатели и коррозионная стойкость, а также приводятся области применения данных сплавов. Ключевые слова: объемные металлические стекла, прочность, пластичность, применение. Лузгин Д.В. -докт. техн. наук, профессор Университета Тохоку (2-1-1 Катахира, Аоба-ку, Сендай, 980-8577, Япония).Louzguine-Luzgin D.V., Pol'kin V.I. Properties of bulk metallic glassesA relatively small number of revolutionary discoveries were made in the field of metallurgy and metal physics in the last few decades, and bulk metallic glasses are one of them. The strength and hardness of bulk metallic glasses are much higher while moduli of elasticity are lower than those of crystalline alloys which results in high stored elastic strain energy. These alloys also have very good corrosion resistance. This article covers various properties of bulk metallic glasses, in particular thermal, mechanical, magnetic, electrical properties and corrosion resistance as well as applications of these alloys.Citation: Louzguine-Luzgin D.V., Pol'kin V.I. Svoistva ob"emnykh metallicheskikh stekol. Izv. vuzov. Tsvet. metallurgiya.
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