High entropy alloy nanocomposites produced by high pressure torsion

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

“…Similar to the microstructural observations made in this work (Fig. 9d and f), recent studies on shear-induced mixing and co-deformation of dissimilar materials and heterophases [13][14][15] also reported vortex-like microstructures. It was suggested [13,14] that such microstructure resulted from a shear-induced mutual diffusive mass transfer across the interface between the constituents, analogous to turbulence in fluid dynamics.…”

“…Benefiting from this advantage, HPT can be utilized to process refractory HEAs. Apart from nanocrystallization and strain-hardening studies, HPT was also applied to investigate the mixing of two dissimilar materials during mechanical alloying [13][14][15]. By plastic shearing of materials, HPT can impose large amounts of crystal defects, e.g.…”

A Review of Recent Research on Nanoindentation of High-Entropy Alloys Processed by High-Pressure Torsion

“…4. 82) As shown in Fig. 4(a), two distinct phases are clearly identified by the cluster maps and, more importantly, the average values of hardness for Phase 1 (i.e., FCC phase) and Phase 2 (i.e., BCC phase) gradually increase with increasing numbers of HPT turns.…”

“…Recently, there have been several attempts to fabricate nanocomposites by performing the HPT processing on dualphase HEAs (such as Al 0.7 CoCrFeNi) 81) or two disks of HEAs with different phases. 82) For example, Taheriniya et al 82) produced an FCC CoCrFeMnNi and BCC Hf NbTaTiZr nanocomposite via HPT processing (Fig. 3(a) 3(e)) and reported that the microhardness of the composite was found to be superior to the HPT deformed single-phase matrices after the same number of revolutions, i.e., the imposed ideal shear strains (Fig.…”

Deformation-induced homogenization of the multi-phase senary high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

“…Furthermore, dualphase HEAs have also been investigated extensively due to their unique mechanical and physical properties. For example, some dual-phase HEAs consist of both body-centered cubic (BCC) and face-centered cubic (FCC) phases [12], while others comprise a soft solid solution matrix and hard intermetallic phases [13]. In addition, the use of HPT has been extended for the fabrication of HEAs by mechanical alloying pure elemental powders [14].…”