112 research outputs found
The initial distribution of alloy components in the experiment of temperature programming desorption
No full textМорозов Сергей Иванович – доцент, кандидат физико-математических наук, кафедра общей и теоретической физики, Южно-Уральский государственный университет. Е-mail: [email protected]. Morozov Sergey Ivanovich is Cand. Sc.(Physics and Mathematics), associate professor, General and Theoretical Physics Department, South Ural State University. Е-mail: [email protected]
Жеребцов Дмитрий Анатольевич – кандидат химических наук, инженер, кафедра физической химии, Южно-Уральский государственный университет.
Zherebtsov Dmitry Anatolievich is Cand. Sc.(Chemistry), engineer, Physical Chemistry Department, South Ural State UniversityРассмотрены состояния свободной поверхности двухкомпонентных
сплавов Cu–Ag по изображениям, полученным с помощью растрового электронного микроскопа. Исследовано начальное распределение компонентов
сплавов, изученных методом температурно-программируемой десорбции.
Подтверждено расслоение поверхностного твердого раствора на две фазы,
богатые медью и серебром, отмечена их эволюция в зависимости от объемного содержания серебра. This paper considers the conditions of thebinary alloys Cu–Ag free surfaces judging by the images obtained by means of a scanning electron microscope. The initial distribution of alloy components, studied by temperature programming desorption method, were analyzed. The solid solution layering to Cu and Ag rich phases was confirmed. Their evolution depending on Ag volume content was observed
Surface phases in iron-based alloys
No full textМорозов Сергей Иванович – кандидат физико-математических наук, доцент, кафедра общей и теоретической физики, Южно-Уральский государственный университет. е-mail: [email protected]. Жеребцов Дмитрий Анатольевич – инженер, кандидат химических наук, кафедра физической химии, Южно-Уральский государственный университет. Грибачёв Антон Сергеевич – аспирант, кафедра общей и теоретической физики, Южно-Уральский государственный университет. Morozov Sergey Ivanovich is a Cand. Sc.(Physics and Mathematics), associate professor of the General and Theoretical Physics Department, South Ural State University. е-mail: [email protected]. Zherebtsov Dmitry Anatolievich is a Cand. Sc.(Chemistry), engineer of the Physical Chemistry Department, South Ural State University.
Gribachev Anton Sergeyevich is a postgraduate student, General and Theoretical Physics Department, South Ural State University.Рассмотрены состояния свободной поверхности трехкомпонентных сплавов Fe–C–S по изображениям, полученным с помощью растрового электронного микроскопа. Подтверждена гипотеза о формах поверхностных фаз углерода и железа при комнатных температурах, предложенная в работах по изучению термической десорбции исследуемых сплавов в твердом и жидком состояниях. This paper considers the conditions of the ternary alloys Fe–C–S free surfaces judging by the images obtained by means of a scanning electron microscope. The hypothesis on the forms of carbon and iron surface phases at room temperature suggested in works on thermal desorption of solid and liquid alloys is confirmed
Design of High-Entropy Alloys
No full textHigh-entropy alloys (HEAs) and related complex, concentrated alloys (CCAs) have resulted from new approaches to alloy design, which emerged 18 years ago [...
The mathematical modeling of the experiment on the determination of correlation coefficients in neutron beta-decay
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Attosecond-controlled photoemission from metal nanowire tips in the few-electron regime
No full textMetal nanotip photoemitters have proven to be versatile in fundamental nanoplasmonics research and applications, including, e.g., the generation of ultrafast electron pulses, the adiabatic focusing of plasmons, and as light-triggered electron sources for microscopy. Here, we report the generation of high energy photoelectrons (up to 160 eV) in photoemission from single-crystalline nanowire tips in few-cycle, 750-nm laser fields at peak intensities of (2-7.3) × 1012 W/cm2. Recording the carrier-envelope phase (CEP)-dependent photoemission from the nanowire tips allows us to identify rescattering contributions and also permits us to determine the high-energy cutoff of the electron spectra as a function of laser intensity. So far these types of experiments from metal nanotips have been limited to an emission regime with less than one electron per pulse. We detect up to 13 e/shot and given the limited detection efficiency, we expect up to a few ten times more electrons being emitted from the nanowire. Within the investigated intensity range, we find linear scaling of cutoff energies. The nonlinear scaling of electron count rates is consistent with tunneling photoemission occurring in the absence of significant charge interaction. The high electron energy gain is attributed to field-induced rescattering in the enhanced nanolocalized fields at the wires apex, where a strong CEP-modulation is indicative of the attosecond control of photoemission
Effect of high-pressure torsion on structure and microhardness of ti/tib metal–matrix composite
No full textEffect of high-pressure torsion (HPT) at 400 °C on microstructure and microhardness of a Ti/TiB metal–matrix composite was studied. The starting material was produced by spark plasma sintering of a mixture of a pure Ti and TiB2 (10 wt %) powders at 1000 °C. The microstructure evolution during HPT was associated with an increase in dislocation density and substructure development that resulted in a gradual microstructure refinement of the Ti matrix and shortening/redistribution of TiB whiskers. After five revolutions, a nanostructure with (sub) grain size of ~30 nm was produced in Ti matrix. The microhardness increased with strain attaining the value ~520 HV after five revolutions. The contribution of different hardening mechanisms into the hardness of the Ti/TiB metal–matrix composite was quantitatively analyzed
Loss of coherency of the alpha/beta interface boundary in titanium alloys during deformation
No full textThe loss of coherency of interphase boundaries in two-phase titanium alloys during deformation was analyzed. The energy of the undeformed interphase boundary was first determined by means of the van der Merwe model for stepped interfaces. The subsequent loss of coherency was ascribed to the increase of interphase energy due to absorption of lattice dislocations and was quantified by a relation similar to the Read-Shockley equation for low-angle boundaries in single-phase alloysyesBelgorod State Universit
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