The grain size, and therefore the grain boundary density, is known to play a major role in the
flow stress of metallic materials. A linear relationship to the inverse of the square root of the …

Abstract Bulk nanostructured (ns)/ultrafine-grained (UFG) metallic materials possess very
high strength, making them attractive for high strength, lightweight and energy efficient …

High-pressure torsion (HPT) method currently receives much attention as a severe plastic
deformation (SPD) technique mainly because of the reports of Prof. Ruslan Z. Valiev and his …

Twenty-five years ago, in 1988, there appeared a classic description of the application of
severe plastic deformation (SPD) to bulk solids in order to achieve exceptional grain …

Ultrafine-grained materials display almost no strain hardening, an enhanced strain rate
sensitivity and grain boundary offsets during plastic deformation. It is expected that …

The effect of the grain size on the mechanical properties of metallic materials has been a
topic of significant interest for researchers and industry. For many decades, a relationship …

The grain size in pure elements (magnesium, aluminum, silicon, titanium, vanadium,
chromium, iron, nickel, copper, zinc, germanium, zirconium, niobium, molybdenum …

Pure Mg (99.9%) is processed by high-pressure torsion (HPT) at room temperature. The
hardness behavior with imposed strain is similar to pure Al (99.99%), having a hardness …

Several pure metals (magnesium, aluminum, iron, cobalt, nickel, copper, zinc, palladium and
silver) and single-phase Al–Mg, Al–Ag, Al–Cu, Cu–Al, Cu–Zn, Pd–Ag, Ni–Fe and Ni–Co …

High-pressure torsion (HPT) is an attractive processing method in severe plastic deformation
techniques involving the application of high compressive pressure with concurrent torsional …