EBSD Characterization of Pure Iron Deformed by ECAE
Polycrystalline iron was deformed by eight ECAE passes using the route Bc to a total strain of 9.2. After deformation the material was annealed at temperatures up to 800oC. Scanning electron microscopy (SEM) and high-resolution electron backscatter diffraction (EBSD) were used to characterize both deformed and annealed structures. In the as-deformed state, the mean grain size is 650 nm and the volume fraction of high angle boundaries (VHAB) is 56%. Upon annealing there is a pronounced softening above 300oC. At the beginning of recrystallization, at about 400oC, the VHAB increases to 71%. The results indicate that discontinuous recrystallization is the main softening mechanism in severely deformed iron.
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
R. A. Renzetti et al., "EBSD Characterization of Pure Iron Deformed by ECAE", Materials Science Forum, Vols. 638-642, pp. 1995-2000, 2010