Texture Heterogeneity in ECAP Deformed Copper

Abstract

Polycrystalline copper of 4N purity has been deformed by equal channel angular pressing at room temperature using route BC. Local textures have been measured by high-energy synchrotron radiation along 3 lines in the cross section from the top to the bottom of the billets. The texture heterogeneity observed in the cross section is presented for 2 passes and discussed with regard to friction-affected material flow.

Microstructure and texture evolution in a Cu–Ni–Si alloy processed by equal-channel angular pressing

“…This deviation was observed and designated "tilts" in the earlier literature [11,54]. In practice, the tilts can be estimated quantitatively from the ODF and they range between 5 and 20° which is consistent with the earlier observation in pure Al after ECAP for 1-3 passes though route A [57].…”

“…The appearance of the rotated Cube component was observed earlier during ECAP deformation [11,54] and it was explained by the occurrence of dynamic recrystallization. In the present experiments, dynamic recrystallization is probable because of the ECAP processing temperature of 423 K which will accelerate the kinetics of recrystallization.…”

“…These factors modify the nature of the rotation field around the ideal position and thus their locations.It is interesting to calculate the texture index values showing the degree of texture strength and to compare these values after increasing numbers of ECAP passes. The texture strength index, I, is estimated from the relationship[54]:…”

Influence of alloying with hafnium on the microstructure, texture, and properties of Cu–Cr alloy after equal channel angular pressing

“…The dominating shear component is {112} h110i as has also been observed for ECAP-route-Bc-deformed Cu, e.g. [26]. With additional Hf alloying, the texture strength decreases by about a factor of two.…”

Microstructural Stability of a Niobium Single Crystal Deformed by Equal Channel Angular Pressing

“…ECAP-processed materials can display pronounced texture heterogeneity, i.e., texture variations from one position to another in the processed material 22,[39][40][41] . These variations have distinct causes such as friction (die-workpiece), massive shear banding and grain orientation effects 42 .…”