EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

Abstract

Abstract. The deformed microstructure and recrystallization behavior of copper samples processed using equal channel angular extrusion (ECAE) have been investigated. The heavily deformed microstructure was found to be non-uniform through the sample thickness and to vary in a manner consistent with the non-uniform distribution of strain imposed by processing. The through-thickness heterogeneity of the deformed microstructure resulted in a different extent of recrystallization in different layers during annealing. Recrystallized grains were also observed in samples that were not annealed, but stored at room temperature, which indicates that the deformed microstructure of ECAE-processed pure copper is unstable even at room temperature. In each sample, recrystallization was found to initiate in regions containing predominantly large misorientations.

Characterization and influence of deformation microstructure heterogeneity on recrystallization

“…A discussion of the motivations for the choices of the values for these parameters is given elsewhere [35]. The values used here have, however, been found to be good choices for comparing heterogeneity in refinement by HABs between samples deformed under a number of different processing conditions [34][35][36][37][38][39][40][41]. [34]; (b) sample described in [40].…”

EBSD-Based Techniques for Characterization of Microstructural Restoration Processes during Annealing of Metals Deformed to Large Plastic Strains

“…Moreover, it was found that the f LMR parameter was better correlated to the variation in recrystallization behavior across the sample thickness than the f HAB parameter [9]. Further details of this investigation are given elsewhere in these proceedings [15]. Table 1: Quantitative description of the microstructure shown in Fig.…”