Grain Subdivision and Its Effect on Texture Evolution in an Aluminum Alloy Under Plane Strain Compression

Microstructural evolution during extrusion of equal channel angular-pressed AA1070 alloy in micro/mesoscale

“…Whereas, after the fourth pass, the structure shows more homogeneous grains with average grain size is of ∼ 2 μm. The grain refinement taken place is mainly due to the grain subdivision mechanism [15][16][17][18]. This mechanism is similar to that proposed by Hughes and Hansen [19] for HAGBs formation in rolling and torsion.…”

Role of crystallographic texture on the improvement of hydrogen-induced crack resistance in API 5L X70 pipeline steel

“…Although a small fraction of CSL boundaries was characterised in both samples, it is believed that special boundaries (CSL) with lower stored energy rather HAGBs provide a resistance to crack paths ahead of the crack tip [38]. However, the results were in contrast to hypothesis [37]. Thus, detailed CSL grain boundary distributions are illustrated as well.…”

“…This suggests that the lower level of deformation was induced in this condition, due to the possibility of dislocation motions across grains increasing the HIC resistance. Ma et al [37] reported that the average misorientation angle in {001} grains only reaches 15e30 . Meanwhile, grains oriented with {110} and {112}//ND tend to increase the misorientation angle to 30e60 , leading to sufficient driving force to facilitate the nucleation of recrystallised grains.…”

Grain size affecting the deformation characteristics via micro-injection upsetting

“…The mechanism of grain subdivision [31][32][33][34] is mainly ascribed to the dislocation boundaries (dense dislocation walls) [35][36][37] that rise due to trapping of the dislocations which in turn form subgrains or cell blocks with LAGBs within the interior of grains [37,38]. These boundaries strengthen and eventually evolve into low-angle boundaries (LAGBs, < 15°).…”