Supercube grains leading to a strong cube texture and a broad grain size distribution after recrystallization

Abstract

2015). Supercube grains leading to a strong cube texture and a broad grain size distribution after recrystallization. Philosophical Magazine, 95(22), 2427-2449. DOI: 10.1080/14786435.2015 AbstractThis work revisits the classical subject of recrystallization of cold-rolled copper. Two characterization techniques are combined: 3-dimensional X-ray diffraction using synchrotron Xrays, which is used to measure the growth kinetics of individual grains in situ, and electron backscatter diffraction, which is used for statistical analysis of the microstructural evolution. As the most striking result, the strong cube texture after recrystallization is found to be related to a few super large cube grains, which were named supercube grains. These few supercube grains become large due to higher growth rates. However, most other cube grains do not grow preferentially. Because of the few supercube grains, the grain size distribution after recrystallization is broad. Reasons for the higher growth rates of supercube grains are discussed, and are related to the local deformed microstructure.

The influence of multiscale heterogeneity on recrystallization in nickel processed by accumulative roll bonding

“…A negative deviation of the JMAK-plot from a straight line is not surprising, as similar behavior has also been seen in other materials, e.g. rolled copper [43,44]. Several reasons could lead to such a deviation, including both a non-uniform distribution of nucleation sites and non-uniform growth of the nuclei.…”

Importance of Non-uniform Boundary Migration for Recrystallization Kinetics

“…The chemical composition was measured using optical emission spectroscopy, and is listed in Table I. The starting material had a grain size of 22 µm, and a weak initial texture [18]. The sample was cold rolled to 90% reduction in thickness in several passes using a rolling mill with a roller diameter of 340 mm.…”

“…For example, using 3D X-ray diffraction (3DXRD) [16][17][18] the nucleation incubation time and growth rate of individual nuclei/grains can be determined for bulk samples. With near-field high-energy Xray diffraction microscopy (nf-HEDM) [19] and differential aperture X-ray microscopy (DAXM) [20], the nucleation sites in the deformed matrix can be pinpointed.…”

Effect of cross cold rolling and annealing on microstructure and texture in pure nickel

“…However, with increasing annealing time the recrystallized cube-oriented grains do not have a size advantage in comparison with the noncube-oriented grains nucleated at the initial stage. Previously, several literatures [6,25,26] demonstrated that the size advantage of cube-oriented grains was attributed to the higher growth rate for the cube-oriented grains misoriented 40~60 ∘ with surrounded matrix about <111> axis in the unidirectionally rolled specimens. Lin et al [26] demonstrated that the higher growth rate for super-cube oriented grains was related to the preferential growth into S-oriented matrix.…”