Twinning-induced dynamic recrystallization in a magnesium alloy extruded at 450°C

Structure of grain boundaries with 30°[0 0 0 1] misorientation in dynamically recrystallized magnesium alloys

“…Hence, we only need to consider symmetric GBs. Additionally, alloying elements affect GBE if they are segregated at GBs, but the 30°misorientation have been observed irrespective of alloy type and composition [5][6][7][8][9][10][11][12][13][14][15][16], so our CSL analysis of pure Mg should be legitimate for Mg alloys, and we focused our simulations on the 30°misorientation. Fig.…”

“…After thermomechanical processing of Mg alloys, a particular type of grain boundaries (GBs), i.e. 30°[0 0 0 1] misorientation has been repeatedly observed with an intensity peak in the distribution of the misorientation angle [5][6][7][8][9][10][11][12][13][14][15][16] in dynamically recrystallized microstructures of Mg and Mg alloys. This type of GBs appears to be common in HCP metals, for example, it was also observed in Zr [17].…”

Enhancing mechanical properties of Mg–Sn alloys by combining addition of Ca and Zn

“…At first, the plastic deformation would start with activation of basal and non-basal slip mechanism due to the high extrusion temperature [35]. However, with presence of the second-phases, movements of the dislocations are hindered, and the high stress concentration can be generated at the interface between matrix grain and hard particles.…”

Twinning, recrystallization and texture development during multi-directional impact forging in an AZ61 Mg alloy

“…Zhu et al [13] applied thermomechanical plain-strain simulations to investigate microstructural evolution of a ZK60 Mg alloy during high strain-rate rolling process and proposed that high propensity of twinning at high strain rates provided nucleation sites for DRX at the initial strain, finally resulting in a fully DRXed microstructure. Ma et al [14] found that twinning still plays an important role in DRX in an AZ61 Mg alloy during extrusion even at 450 ο C. Furthermore, Ma et al [15] investigated the texture M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 evolution during DRX in an extruded AM30 Mg alloy at 450 ο C and found that twinning significantly contributed to the microstructure and texture at relatively high strain rates. However, to date there have been limited studies on the microstructure and texture evolution in Mg alloys during multi-directional forging with high strain rate.…”