High-pressure torsion (HPT) is widely used as a severe plastic deformation technique to create ultrafine-grained structures with promising mechanical and functional properties. Since 2007, the method has been employed to enhance the hydrogenation kinetics in different Mg-based hydrogen storage materials. Recent studies showed that the method is effective not only for increasing the hydrogenatio...

High-pressure torsion (HPT) is applied to a face-centered cubic CoCrFeMnNi high-entropy alloy at 293 and 77 K. Processing by HPT at 293 K produced a nanostructure consisted of (sub)grains of ~50 nm after a rotation for 180◦. The microstructure evolution is associated with intensive deformation-induced twinning, and substructure development resulted in a gradual microstructure refinement. Deform...

In the present work, effects of loading scheme and strain reversal on structure evolution are studied by using high pressure torsion (HPT) and twist extrusion (TE) techniques. High purity aluminum (99.99%) was processed at room temperature up to a total average equivalent strain of ~4.8 by TE and HPT with two deformation modes: monotonic and reversal deformation with a step of 12 ̊ rotation. It ...

The mechanical properties of engineering materials are key for ensuring safety and reliability. However, the plastic deformation of BMGs is confined to narrow regions in shear bands, which usually result in limited ductilities and catastrophic failures at low homologous temperatures. The quasi-brittle failure and lack of tensile ductility undercut the potential applications of BMGs. In this rep...

A demand for cheap and simple methods of processing nanocrystalline materials attracted attention to metal forming techniques allowing introduction large strains into metallic materials. Thanks that a new scientific field, “Materials by severe plastic deformation”, had been born became an important segment material science. High pressure torsion (HPT) is the most effective SPD method in respect...

High-purity Ni was processed by high-pressure torsion (HPT) at room temperature under an imposed pressure of 6.0 GPa and a rotation rate 1 rpm through 1/4 to 10 turns, samples were then examined using Electron Back-Scattered Diffraction (EBSD) microhardness measurements. The results show that the grain size low-angle boundaries (LAGBs) gradually decrease with growth HPT revolutions while values...

For the first time, tribological behaviour of 316 L stainless steel (316 SS) additively manufactured via laser powder bed fusion (L-PBF) with ultrafine- and nano-grains obtained from high-pressure torsion (HPT) processing has been investigated. The pin-on-disk dry sliding wear test results demonstrate enhancement performance after HPT processing, as indicated by consistently lower coefficient f...

The Pb–Sn alloy has a wide use in the electronic, energy storage and nuclear industries fine-grained may open up new possibilities for applications these industries. In order to understand behavior of grain refinement, Pb-62% Sn eutectic was processed by high-pressure torsion (HPT), stored at room temperature (RT) then microstructures after HPT were repeatedly investigated during course self-an...

Disks of commercial Al-1050 and ZK60A alloys were stacked together and then processed by conventional high-pressure torsion (HPT) through 1 and 5 turns at room temperature to investigate the synthesis of an Al–Mg alloy system. Measurements of microhardness and observations of the microstructures and local compositions after processing through 5 turns revealed the formation of an ultrafine multi...

Mechanical properties of high-entropy alloys (HEAs) have received significant attention, while there are still attempts to find new strategies further improve their properties. In this study, produce an ultrahard HEA, FCC carbide was introduced in a BCC-based AlTiFeCoNi alloy by the assistance CALPHAD thermodynamic calculations. The synthesized arc melting and processed severe plastic deformati...