High-pressure torsion applied to nickel single crystals

Thermal stability of nanocrystalline structure in niobium processed by high pressure torsion at cryogenic temperatures

“…As well documented in the literature [see, e.g., 14,[17][18][19], grain refinement at HPT proceeds through three main stages, the first of which is the formation of the dislocation cell structure. With strain growth dislocation density increases, and dislocations are not randomly stored in the structure but concentrate mainly into cell boundaries.…”

Study of Anisotropic Plastic Behavior in High Pressure Torsion of Aluminum Single Crystal by Crystal Plasticity Finite Element Method

“…Tóth et al [49,50] reported that in simple shear of cube orientation the orientation change took place solely around the sample radial axis, leading to the rotated cube component. Hafok and Pippan [16] and Arzaghi et al [51] have examined the texture evolution during HPT, respectively, and they reported that the C orientation could be maintained over a wide range of straining in HPT. Further examination of the pole figure in Figure 3g Figure 3h,i, respectively.…”

“…From these observations, it can be concluded that the texture also develops a four-fold symmetry along the sample circumference. Hafok and Pippan [16] experimentally measured the texture evolution in the tangential direction of (001) nickel single crystal deformed by HPT. They also reported the phenomenon of repetition of the texture development and Crystals 2017, 7, 362 7 of 11 the evolution of a four-fold symmetry at the early stage of HPT deformation, which helps to validate the established CPFEM model of the HPT process.…”

“…Their results showed the differences in deformation behavior of different initially orientated single crystals. Hafok and Pippan [16,17] experimentally examined the texture evolution of nickel and copper single crystals subjected to HPT deformation. They reported that the texture of the (001)-oriented single crystal developed a four-fold symmetry along the sample tangential direction.…”

Texture Changes during Simple Shear Extrusion (SSE) Processing of Pure Copper

“…Studies of texture evolution are important for understanding the anisotropy of the physical and mechanical properties of the materials processed by severe plastic deformation (SPD) methods, which involve large strain levels and frequent strain path changes. The texture of the basic and most familiar SPD techniques like equal channel angular pressing (ECAP) 1,2) , high pressure torsion (HPT) 3,4) , accumulated roll bonding (ARB) 5,6) were studied widely before.…”