Evolution of crystallographic texture during equal channel angular extrusion of copper: The role of material variables

Abstract

The evolution of crystallographic texture during equal channel angular extrusion (ECAE) using route A has been investigated experimentally as well as by simulations for three types of materials: pure, commercially pure, and impure (cast) copper. The ECAE texture of copper can be compared with simple shear textures. However, there are deviations in terms of location of the respective components. These differences can be nearly reproduced using a recent flow line approach for ECAE deformation (L.S. Tóth, R. Arruffat-Massion, L. Germain, S.C. Baik, and S. Suwas: Acta Mater., 2004Mater., , vol. 52, pp. 1885 with the help of the viscoplastic self-consistent polycrystal model. The main texture components common to all three materials are A 1E and ; the latter ones are significantly stronger in the cast material. The effect of further deformation on texture modification depends on material variables, such as purity, initial microstructure, and texture.

Deformation field heterogeneity in punch indentation

“…These are typically referred to as α and β fibres, respectively, and have been observed following the deformation that occurs during rolling, which can be idealized as plane-strain compression. The deformation texture changes considerably in the highly strained region (III) in figure 8d, where the texture is similar to that observed in deformation of copper by simple shear [23][24][25]. The variation in textures indicates differences in the modes of deformation in the indentation region, where a state of plane-strain compression is present directly underneath the indenter and a state of simple shear is present at the corners of the indenter.…”

Equal channel angular pressing of a TWIP steel: microstructure and mechanical response

“…ECAP passes following BC route has not been observed [36], but it has been described in other studies [37,38] which used a die with a similar setting to the one in the present case. When the die has an external angle Ψ>0° the textures exhibit some predominant orientations with a continuous distribution along the orientation fibers with simple shear texture, where two symmetrical areas can be observed [37].…”

Analysis of Crystallographic Textures in Aluminum Plates Processed by Equal Channel Angular Extrusion

“…[1] While the effect of processing route on the microstructure and texture development in ECAE-deformed rods and bars has been investigated in a large number of publications [2][3][4][5][6] , only a few studies have been carried out for establishing this effect for ECAE-processed plates, for which new routes, different from those proposed for rod or bar samples, can be utilized. [7][8][9][10][11] In a recent work on AA1050 plates deformed by 8 ECAE passes either without rotation between passes (route A) or with 90 deg sequential rotations about the plate normal ND (route B C〈ND〉 ), [11] it was found that the microstructure obtained via route B C〈ND〉 was more refined than that obtained via route A.…”

“…[11] The effect of the processing route on texture evolution in ECAE plates was investigated by Ferrasse et al [9,10] However, these authors considered a large number of orientation fibers differing from the shear-type fibers commonly adopted for characterizing ECAE textures, [2][3][4][5][6] which complicates a comparison of textures in their plate samples with those in rod samples described in many other publications. To better compare the general tendencies of texture evolution during ECAE of plates with those of rod samples, a modeling and experimental investigation of textures formed by ECAE has therefore been carried out and is described in the present work for commercial purity aluminum.…”

“…It is pertinent to mention that a similar PSC-type deformation would still occur for N > 1 passes via route B C〈ND〉 if the length of an initial plate is made shorter than its width to avoid the need to trim the sample after the first pass. 4 To roughly evaluate the effect of additional PSC on the texture development via route B C〈ND〉 , the 8-pass texture for this route was simulated with additional 10 pct PSC deformation (with compression along the pressing direction) before simple shear for each of the N > 1 passes. The result is shown in Figure 1(e).…”