CoCrMo alloys are used in hip and knee replacements due to their excellent long-term survival rates. However, high failure rates have recently been observed associated with adverse tissue reactions. alloy surfaces undergo microstructural changes during wear, including the formation of ?-martensite and, occasionally, a nanocrystalline surface layer. It is not clear whether these beneficial or de...

Abstract. The thermal stability of ultrafine-grained metals can be fully understood when observing time-resolved microstructural changes over multiple-length scales. global relaxation behavior upon heating an (UFG) CoCrFeNi high-entropy alloy (HEA) was characterized by in-situ neutron diffraction measurements. Before heating, the nanocrystalline microstructure introduced applying high-pressure ...

Among the severe plastic deformation processing (SPD) of materials, high-pressure torsion (HPT) is known to induce considerable amounts strain and crucial grain refinement up nanometer scale. There have been several reviews on mechanical properties and/or microstructure correlations SPD-processed materials published during last two decades. By contrast, a review crystallographic texture evoluti...

This presentation demonstrates a simple and very rapid synthesis of metal matrix nanocomposites (MMNCs) in Al-based hybrid systems which are achieved by processing stacked disks of two pure metals through the application of high-pressure torsion (HPT) at ambient temperature. These synthesized hybrid systems exhibit exceptionally high hardness through rapid deformation-induced diffusion and the ...

The paper presents the evaluation of the mechanical and fatigue properties of an ultrafine-grained (UFG) Al 6061 alloy processed by high-pressure torsion (HPT) at room temperature (RT). A comparison is made between the UFG state and the coarse-grained (CG) one subjected to the conventional aging treatment Т6. It is shown that HPT processing leads to the formation of the UFG microstructure with ...

The present work unravels the effect of nickel (Ni) addition on deformation mechanism and hardness evolution in a Fe40Mn40Co10Cr10 high entropy alloy (HEA) during high-pressure torsion (HPT) processing. For this purpose, two variants Cantor alloy, with compositions (atomic%) (Ni0 alloy) Fe35Mn35Co10Cr10Ni10 (Ni10 were selected. study revealed transition predominant plasticity Ni from TRIP Ni0 t...

To gain insight into the origin of the ultra-high strength of ultrafine-grained (UFG) alloys, the solute clustering, precipitation phenomena, and microstructural evolutions were studied in an UFG Al-4.63Cu-1.51Mg (wt.%) alloy (AA2024) processed by high-pressure torsion (HPT). The thermal analysis was performed using differential scanning calorimetry. The microstructures, internal microstrains a...

Abstract An equiatomic MoNbTaTiVZr refractory high-entropy alloy (HEA) produced by arc melting was processed high-pressure torsion (HPT) at room temperature. Thermodynamic calculations and experimental results indicated a dual-phase microstructure composed of about 85% BCC Zr-depleted 15% Zr-rich phase in the as-cast condition. HPT causes grain refinement an increase dislocation density without...

High pressure torsion (HPT) at room temperature was used for post-treatment of additively manufactured Fe–Cr–Ni stainless steel with 12.9 wt % Ni as a very strong austenite stabilizer. The results showed that HPT caused considerable increase in nanohardness the samples. In contrast thermodynamic equilibrium-state modeling, phase transformation from FCC to HCP structure occurred, leading formati...

Commercial purity titanium (CP-Ti) and a Ti-6Al-4V alloy (Ti64) were processed by high-pressure torsion (HPT) for 10 20 turns. The HPT processing produced nanostructured microstructure significant strength enhancement in the CP-Ti Ti64 samples. After turns, samples of HPT-processed subjected to laser surface treatments an air atmosphere using different scanning speeds powers. roughness laser-mo...