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.
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
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.
Металловедение и термическая обработка Izvestiya vuzov. Tsvetnaya metallurgiya • 6 • 2015 43 ВведениеПриродные оксидные стекла легко образуются при охлаждении расплава, в то время как промыш-ленные металлические сплавы имеют кристалличес-кую структуру в литом состоянии. Не считая ранних работ по напылению тонких пленок на охлажденные Объемные металлические стекла (ОМС) систем Pd-Cu-Si и Pd-Ni-P были получены из расплава в 70-80-х годах прошло-го века. Однако ввиду исключительной дороговизны основного компонента (палладия) они долгое время не представляли особого интереса для ученых и инженеров. Относительно недавно ОМС в виде слитков макроскопического размера были получены в сплавах на основе промышленных металлов (железа, меди, магния и титана), что открыло широкие возможности для их применения. ОМС обладают высокими показателями прочности, твердости, износостойкости, упругой деформации и сопротивления коррозии. В настоящей работе приведен обзор литературных источников и описаны основные научные достижения в данной области. Отмечено что главными, не до конца решенными научными проблемами являются описания структуры ОМС, а также процессов стеклования и пластической деформации, а технической задачей, приковывающей вни-мание ученых разных стран, -повышение пластичности и ударной вязкости данных материалов. Bulk metallic glasses (BMGs) of Pd-Cu-Si and Pd-Ni-P system were formed from the melt in 1970s-1980s. However, in view of the extremely high cost of the main component (palladium), they were out of special interest for scientists and engineers for a long time.Relatively recently, BMGs in a form of macroscopic-size ingots were fabricated in alloys based on industrial metals (iron, copper, magnesium, and titanium), which opened wide possibilities for their application. BMGs possess high strength, hardness, wear resistance, elastic deformation, and corrosion resistance. In this study, a review of publications is presented and main scientific achievements in this field are described. It is noted that main scientific problems, which are not solved completely, are the description of the BMG structure as well as vitrification and plastic deformation, while the technical problem, which attracts attention of scientists in many countries, is an increase in plasticity and impact fracture toughness of these materials. Keywords: bulk metallic glasses, structure, vitrification, strength, ductility.
Multicomponent alloys without a base element, also known as highly entropic alloys (HEAs), are of great interest for research. The microstructure of the Fe 20 Ni 20 Co 20 Cu 20 Al 20 alloy in a cast, annealed, and deformed state, as well as its mechanical properties and hot deformation ability, is investigated in this article. This alloy is a typical representative of the high-entropy alloy family. Samples are melted in a vacuum induction furnace in an argon atmosphere and then cast into a copper mold. Differential scanning calorimetry results are used to determine the solidus temperature. The homogenization annealing of cast samples is carried out in a high-temperature furnace in air. The microstructure of the alloy is studied by scanning electron microscopy and X-ray diffraction. X-ray microanalysis using X-ray energy dispersive spectroscopy is used to determine the chemical composition of the phases. It is shown that crystallization results in the formation of three solid solutions with one bcc and two fcc crystalline structures. The mechanical properties are investigated under uniaxial compression. Hardness is also measured. The deformation tests are carried out on a DIL805A/D quenching-deformation dilatometer and a Gleeble System 3800 complex for physical modeling and dynamic thermomechanical testing at temperatures of 900-1100°С and strain rates of 0.01-1.0 s -1 for a true degree of deformation of up to 1. Optimum modes of homogenization annealing for the typical representative of HEAs and optimal deformation modes are selected to obtain high mechanical properties.
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