one of the most common methods for production of ultra fine grained materials is severe plastic deformation (spd). in this study, constrained groove pressing (cgp) and high pressure torsion (hpt) processes as effective methods of severe plastic deformation for the strain imposed on the pure copper were used. this paper presents the results of an experimental research, to review the influence of...

Zinc oxide (ZnO) with a rocksalt crystal structure is attractive because of the bandgap which lies in range visible light absorption (1.2–2.6 eV). However, not stable at ambient pressure and temperature according to an equilibrium phase diagram. Nevertheless, this study demonstrates, for first time, that it possible realize 100% fraction temperature. ZnO powder initially processed by severe pla...

An investigation was initiated to examine the effect of rotation speed on the allotropic α to ω-phase transformation in titanium. A grade 2 commercial purity titanium was processed by high-pressure torsion (HPT) at room temperature up to a maximum of 10 turns using a pressure of 5.0 GPa and different rotation speeds from 0.5 to 2 rpm. It is shown that the allotropic phase transformation occurs ...

In this study, a composite with alternate layers of 5056 and 1580 alloys was manufactured wire arc additive manufacturing technology. It is shown that increased strength characteristics material can be obtained deformation treatment using high-pressure torsion (HPT) technique. The microstructure mechanical properties the HPT-processed in different structural states were investigated. exhibits h...

The principle of achieving high strength and superior properties in metal alloys through the application of severe plastic deformation has been exploited in the metal processing industry for many decades. The High Pressure Torsion (HPT) process is one of the most promising techniques for imposing very high strains to a bulk solid without introducing a significant change in sample dimensions. Th...

In this work, a melt-spun amorphous Fe73.5Si13.5B9Cu1Nb3 alloy is subjected to high-pressure torsion (HPT) treatment under 6 GPa in order enhance the alkaline hydrogen evolution reaction (HER) performance. Different HPT turns, including 1, 2, 5 and 10, are selected samples marked as HPT-1N, HPT-2N, HPT-5N HPT-10 N, respectively. The can lead significant structural change such partial crystalliz...

Materials with ultrafine grain sizes are attractive for use in micro-forming operations. High-pressure torsion (HPT) is an effective technique that allows disc materials subjected to torsional deformation to generate microstructures with significant grain refinement. Generally, ultrafine-grained materials exhibit high strength but their ductility is limited because they have both a low rate of ...

An Al–3% Mg–0.2% Sc alloy was solution treated and processed through 10 turns of highpressure torsion (HPT) at 450 K. Afterwards, the HPT-processed alloy was annealed for 1 h at temperatures ranging from 423 to 773 K and its mechanical properties and microstructural evolution were examined using microhardness measurements and electron backscattered diffraction (EBSD) analysis. The results demon...

Abstract The effect of heat treatment on the microstructure, phase composition, mechanical properties, and microhardness shape-memory Сu–14 wt % Al–3 Ni alloy prepared in nanocrystalline state, which results from severe plastic high-pressure torsion (HPT), is studied. Electron microscopy X-ray diffraction analysis are used combination with electrical resistivity measurements order to obtain dat...