This study focuses on the difference in microstructural features and physical properties of Al-2Fe Al-4Fe alloys subjected to large plastic straining. The intermetallic particle morphology initial state is shown be a key parameter influencing grain fragmentation process and, as result, these two alloys. We demonstrate that shape average size Al-Fe particles provide stronger effect microstructur...

The effect of high-pressure torsion (HPT) (P = 8 GPa, e 5.9) and irradiation with continuous beams Ar+ ions energy E 15 keV on the atomic structure phase composition initially quenched iron alloys 4.10 7.25 at.% Mn was studied by method Mössbauer spectroscopy. supersaturated α-solid solution Fe-7.25 Mn, in contrast to stable Fe-4.10 which passes into a highly nonequilibrium metastable state as ...

Superplasticity denotes the ability of a limited number materials to achieve exceptionally high tensile elongations at least 400%. Experiments show that Al-Mg-Sc alloys provide excellent capabilities for achieving superplastic flow and also they can be formed easily in biaxial forming operations. It is important, therefore, examine mechanism when alloy prepared using different procedures. This ...

A commercially pure Cu and a Cu-8 wt.%Sn alloy were subjected to high pressure torsion (HPT) study the effect of Sn as solute element deformation rate on grain refinement mechanism defect accumulation in Cu. The microstructure hardness produced ultrafine grained (UFG) states both materials carefully characterized. We show that addition leads significant decrease size, higher stored energy incre...

High-rate squeezing process of bulk metallic glasses from a cylinder into an intact sheet achieved by impact loading is investigated. Such a large deformation is caused by plastic flow, accompanied with geometrical confinement, shear banding/slipping, thermo softening, melting and joining. Temperature rise during the high-rate squeezing process makes a main effect. The inherent mechanisms are i...

Ultra-fine grained and even nanostructured magnesium alloys obtained by processing with methods of severe plastic deformation (SPD) are promising biomaterials for absorbable orthopaedic implants due to their enhanced mechanical properties, adequate corrosion resistance biocompatibility. This paper presents an overview the impact most important SPD – equal-channel angular pressing (ECAP) high-pr...

The effect of the degree severe plastic deformation (SPD) on thermal stability a nanocrystalline CoCrFeNi multi-principal element alloy was studied. SPD method high-pressure torsion (HPT) utilized to achieve microstructure. structural investigated near centers and edges HPT-processed disks deformed for ½, 1, 5 10 turns. For almost all studied samples, two exothermic peaks in temperature ranges ...

While most of the reports on Mg-Gd-Y-Zr alloys report superplasticity after extrusion or friction stir processing, it is important to investigate superplasticity in these alloys after other severe plastic deformation processes having greater grain refinement capability. Accordingly, superplasticity was studied in an Mg–9Gd–4Y–0.4Zr (GW94) alloy after different high-pressure torsion (HPT) condit...

The present investigation studied the influence of initial texture on large strain deformation behavior hexagonal close packed (HCP) titanium in high pressure torsion (HPT). Discs two distinct textures comprising near basal and prismatic-pyramidal orientations were subjected to HPT at room temperature. X-ray diffraction (XRD) revealed formation omega phase processed samples with fraction increa...