Features of Texture and Structure Development in Zirconium under Equal Channel Angular Pressing

Abstract

A detailed X-ray study of Zr rods, subjected to ECAP at 350oC by routes C and BC, was conducted by the new X-ray method of Generalized Pole Figures, combining texture measurement with registration of X-ray line profiles. The data analysis is based on conceptions of the texture formation theory, connecting features of grain reorientation with activated deformation mechanisms. A degree of reproduction of the same distinctive texture by successive ECAP passes with antecedent rotation of the rod reflects attendant structure changes in material.

Plastic flow anisotropy of pure zirconium after severe plastic deformation at room temperature

“…In the latter, the Zr702 samples had a strong initial texture and using optical microscopy basal slip traces were identified at 20% plastic strain at room temperature. X-ray analysis of Zr ECAE textures also indicated basal slip [15].…”

“…It is also an excellent tool for studying microstructural evolution and deformation mechanisms at very high strain levels, during strain path changes, and under an unconventional deformation mode: near simple shear [13]. Texture analyses of Zr processed by ECAE suggest that basal slip may play a role at large strain [14,15]. The question then arises if the high internal stresses due to reduced grain size, and dislocation accumulation associated with ECAE, could help to overcome the activation barriers for basal slip, which is not commonly observed in Zr.…”

Effect of the Texture of the Ultrafine-Grained Ti-6Al-4V Titanium Alloy on Impact Toughness

“…The lateral surface is perpendicular to the Y axis (see Figure 4 a). It can be seen in the figure that the normals are rotated in the XZ plane, which has been described multiple times in [ 31 , 32 ] and is already regarded as a classic explanation for the formation of a crystallographic texture in the shear plane [ 33 ], the inclination of which is determined by the channels mating angle. In this case, this angle is about 10° with respect to the Z axis.…”

Fatigue strength of submicrocrystalline Ti and Zr-2.5%Nb alloy after equal channel angular pressing

“…: +7 499 1357743; fax: +7 499 1358680; e-mail address: dobatkin@imet.ac.ru in literature, and such data are generally obtained on small samples upon high pressure torsion [7,8]. Only structure examination was performed in the case of equal-channel angular pressing (ECAP) [9,10]. However, numerous studies of other metals and alloys in nanostructured and submicrocrystalline states show a substantial increase (by a factor of 2-8) in the strength properties relative to those observed in the initial state [11].…”