Evaluation of the structural-phase characteristics of a supersaturated ultrafine-grained Au-Co solid solution by diffractometry in hard synchrotron radiation

A synchrotron radiation study of immiscible Au-Co alloys obtained by consolidating a heterogeneous mixture of components and subsequent severe plastic deformation was performed. Namely, the estimates of the crystal lattice parameter, the average size of the coherent scattering regions and lattice strains in mechanically alloyed supersaturated solid solutions were made using obtained diffraction patterns and diffraction spectra. The effect of the temperature regime of deformation processing on the listed characteristics is shown, when the transition from cold deformation to cryogenic is carried out. © 2020 American Institute of Physics Inc. All rights reserved.The work was done at the shared research center SSTRC on the basis of the VEPP-4 - VEPP-2000 complex at BINP SB RAS, using equipment supported by project RFMEFI62119X0022. The SR XRD performed at the station "Diffractometry in the "hard" X-ray range" of the 4th synchrotron radiation channel of the VEPP-3 accelerator of the Siberian Center of Synchrotron and Terahertz Radiation of the Budker Institute of Nuclear Physics by Alexey I. Ancharov. Obtaining and deformation processing of the investigated materials were carried out on the basis of M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg. The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme “Рressure” No. АААА-А18-118020190104-3), supported in part by RFBR (project No. 19-32-60039)

Shear stress in high-pressure torsion and vickers hardness of Au-Co alloys

Alloys of the Au-Co system characterized by restricted solubility of the constituents were produced by shear deformation under high quasi-hydro static pressure. Resistance to shear strain was recorded during mechanical fusion. The forming pressure dependence of shear stress dunng deformation has been revealed, with the form of the curve remaining qualitatively unchanged. The form of the curve for the joint deformation of the Au-Co constituents differs from the curve recorded during the deformation of one constituent, namely gold. In the former case there are stages of sharp increase, retardation, and attainment of saturation, whereas in the latter case there is a sharp increase followed by attainment of saturation. This indicates the appearance of the deformation interaction of the constituents, which manifests itself in a prolonged increase in shear stress with an increase in strain, as distinct from the case of a single element, where there occur only structural changes caused by torsion under pressure. After the samples had been made, their Vickers hardness was measured, which demonstrates practically equal values of the hardness of the Au-Co alloys produced under different pressures. © 2020 American Institute of Physics Inc.. All rights reserved.The study was performed under a state assignment and with a financial support from the RFBR, project No. 19-32-60039. The materials were produced and processed on the basis of the IMP UB RAS, Ekaterinburg

Structure and Properties of Ca1-xEuxMnO3 Single Crystals

The crystal growth of electron-doped manganites Ca1-xEu xMnO3 by the floating zone method is reported. The special features of the growth parameters are discussed. Results of x-ray analysis, magnetic and transport characteristics are shown. © (2012) Trans Tech Publications