Problematic issues related to the development, machinability and application of new high-strength ceramic materials are viewed. Such possess high hardness comparable abrasive materials. Therefore, it makes difficult produce such using traditional techniques. To solve this problem, we have proposed modernization PP 600F machine with implementation combined electro-diamond processing diamond wheels on a binder metal. The provides for development special components structures current collector,...

The present study investigates the effect of stress triaxiality on mechanical behavior and fracture Ti-5Al-2.5Sn alloy in a practical relevant strain rate range from 0.1 to 1000 s−1. Tensile tests were carried out flat smoothed notched specimens using an Instron VHS 40/50-20 servo-hydraulic test machine. High-speed video registration was conducted by Phantom 711 Camera. Strain fields specimen gauge area investigated digital image correlation method (DIC). surface relief studied microscope...

In present work the effect of structural changes in samples, made 1560 aluminum alloy rolled sheet products 1.5 mm thickness, as a result groove pressing treatment was investigated. The mechanical properties material as-received condition and after severe plastic deformation are investigated experimentally quasi-static uniaxial tensile tests at strain rate 1 s^-1. Microhardness samples pressed measured by Vickers method. microhardness thickness were determined. It found that four cycles...

A model for predicting mechanical properties of ultra-high temperature ceramics (UHTC) and composites within a wide range is presented. can be useful the UHTC under dynamic loading thermal shock. Results calculations taking into account dependences nonlinearity normalized elastic moduli on homologous T/Tm in 0.2 - 0.62. are presented.. Residual stresses ZrB2 reinforced with particles refractory borides, carbides nitrides after selective laser sintering (SLS) or spark plasma (SPS) were...

Bioinert metals are used for medical implants and in some industrial applications. This study was performed to detect analyze peculiarities that appear the temperature distributions during quasi-static tensile testing of bioinert alloys. These alloys include VT1-0 titanium, Zr-1%Nb Ti-45%Nb both coarse-grain (CG) ultrafine-grain (UFG) states. The crystal structure, as well domain grain sizes these UFG state, may be different from CG versions identifying thermal signatures occur their...

This article investigated the mechanical behavior of Ti-6Al-4V alloy (VT6, an analog to Ti Grade 5) in range strain rates from 0.1 103 s−1. Tensile tests with various notch geometries were performed using Instron VHS 40/50-20 servo hydraulic testing machine. The Digital Image Correlation (DIC) analysis was employed investigate local fields gauge section specimen. Keyence VHX-600D digital microscope used characterize full-scale fracture surfaces terms fractal dimension. At high rates,...

The microstructural investigation, mechanical properties, and accumulation dissipation of energies the magnesium alloy Mg-2.9Y-1.3Nd in recrystallized state after severe plastic deformation (SPD) by extrusion are presented. use SPD provides formation a bimodal structure consisting grains with an average size 15 µm ultrafine-grained sizes less than 1 volume fractions up to 50%, as well fine particles second Mg24Y5 phases. It is established that grain refinement during accompanied increase...

Predictions on the mechanical behavior of metals and alloys with a hexagonal close-packed (HCP) lattice under dynamic influences in wide range temperatures are demand for solving applied problems. This article presents new results numerical simulation showing general similarity HCP titanium, zirconium, hafnium, beryllium loadings temperatures. These belong to important isomechanical subgroup alloys. A model temperature was proposed. The takes into account change contributions flow stress...

In this paper, the deformation and fracture of Ti–5Al–2.5Sn alloy in complex stress states under biaxial tension at strain rates up to several hundred per second are studied. Such loading conditions provided during high-speed punch tests for thin plates. Samples titanium plates punched with a hemispherical indenter, which is 20 mm diameter, velocities 10, 5.0, 1.0, 0.5 m/s simultaneous recording punching forces maximum deflection video sample surface speed 13.000 frames/s. Numerical...

The paper presents the experimental results of mechanical behavior Ti-5Al-2.5Sn alloy at high strain rates and elevated temperature. Flat smooth notched specimens with notch radii 10 mm, 5 2.5 mm were used. studies carried out using high-velocity servo hydraulic test machine Instron VHS 40/50-20. samples heated flat ceramic infrared emitters on average between 60 s 160 s. temperature control in working part was real time a chromel-alumel thermocouple. digital image correlation (DIC) method...

Features of mechanical behavior nanostructured and ultrafine-grained metals under quasistatic shock wave loadings are discussed. ultrafine grained over a wide range strain rates A constitutive model for metal alloys loading including grain size distribution, precipitate hardening, physical mechanisms shear stress relaxation is presented. Strain rate sensitivity the yield face-centered-cubic, hexagonal close-packed depends on size, whereas Hugoniot elastic limits copper, aluminum, titanium...

Computer simulation techniques are used to investigate the deformation and damage processes taking place in brittle oxide nanostructured ceramics under intense dynamic loading. The pore structure is shown substantially affect size of fragments strength ceramics. In porous subjected shock loading, localized mesoscopic bands having characteristic orientations along, across, at ~ 45° direction propagation wave front. Clusters nanopores cause decreasing shear may be transformed into cracks. A...

Inelastic deformation and damage at the mesoscale level of ultrafine grained (UFG) light alloys with distribution grain size were investigated in wide loading conditions by experimental computer simulation methods. The computational multiscale models representative volume element (RVE) unimodal bimodal distributions developed using data structure researches aluminum magnesium UFG alloys. critical fracture stress on depends relative volumes coarse grains. Microcracks nucleation quasi-static...

In this article, the effect of a severe plastic deformation (SPD) achieved by groove pressing (GP) on grain structure and mechanical properties rolled sheet Al-Mg alloy was investigated. The study microstructure samples before after processing carried out means electron backscattered diffraction (EBSD). were experimentally studied under uniaxial tension in quasi-static conditions, microhardness testing implemented. It found that conventional yield strength ultimate tensile increase factor...

Multiscale computer simulation approach has been applied to research mechanisms of failure in ceramic nanostructured ceramics under dynamic loading. The obtained experimental and theoretical data indicate quasi-brittle fracture ZrB 2 compression tension. Damage nucleation accumulation quasi brittle were simulated impact loadings. Fracture ultra-high temperature pulse shock-wave loadings is provided by fast processes intercrystalline relatively slow via growth coalescence opened microcracks....