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In the present study, the effect of the processing routes (A, BA, BC and C) of equal channel angular pressing (ECAP) on texture evolution has been investigated for different initial microstructural conditions of the 2014 Al alloy. The present study also features the issue of heterogeneity in texture evolution along the thickness of the ECAP processed sample as a function of the processing routes. A stronger texture evolution was observed in the solution treated (ST) conditions for most of the processing routes (A, BA and BC except for C) due to the increased contribution from solid solution hardening during ECAP. A comparatively weak texture evolution is observed for as extruded+annealed and solutionised+aged conditions because of the strain scattering due to the fragmentation and dissolution of precipitates. The texture evolution along the thickness direction for ST samples suggests that the inherent heterogeneity of the ECAP process is minimised when processed via route C.

In this study, equal channel angular pressing (ECAP) with and without back pressure was used for consolidation of fine mechanically alloyed Al-Yttria composite powder. The effect of ECAP on consolidation behaviour of powder, microstructure, density and hardness is discussed. The powder was encapsulated in an aluminium can. Room temperature back pressure aided ECAP results in a nearly full denser (97% of its theoretical density) compact at room temperature. Nano Indentation technique was used to determine the modulus of the ECAP consolidated compact.