Orientation dependent slip and twinning during compression and tension of strongly textured magnesium AZ31 alloy

Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

“…[28][29][30][31] Activation of basal slip is dependent on grain orientation. Experiments [32] and theoretical calculations [33] showed that Schmid factor for basal slip is increased when basal planes are inclined by~45 deg to deformation direction. Since only two independent slip systems can operate on basal plane, twinning is necessary to accommodate plastic strain and fulfill von Mises criterion.…”

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

“…The deformation mechanisms predominant in Mg alloys at low temperatures and low strain rates are now known rather well and have been reviewed in several occasions [4][5][6]. Possible deformation modes include basal ((0 0 01){a>), prismatic ({10-10}(a>) and pyramidal ({10-11 }(a> and {11-22}(c + a>) slip, as well as {10-12} extension and {10-11} and {10-13} contraction twinning.…”

“…These values are of the order of 5 MPa for basal slip, lOMPa for extension twinning, 20 MPa for prismatic slip, 40 MPa for pyramidal slip and 70-80 MPa for contraction twinning. Thus, in the highly textured alloys resulting from conventional rolling or extrusion processes the predominant mechanisms will depend strongly on the loading mode (tension or compression) as well as on the loading direction with respect to the c-axes of the polycrystalline aggregate [4][5][6]8]. In summary, the mechanical behavior and the microstructural evolution during room temperature quasi-static deformation of strongly textured Mg alloys is highly anisotropic.…”

“…Several studies have been carried out to date with the aim of elucidating the predominant DRX mechanisms [6,[14][15][16][17][18][19][20][21][22][23][24][25][26]. Ion et al [14] published in 1982 a pioneer study on the subject, in which they reported that DRX was strongly dependent on the deformation temperature.…”

“…At lower temperatures, continuous type processes (CDRX), consisting on the formation of subgrain boundaries by dislocation accumulation and the gradual increase of their misorientation (8) with strain [27,28], would prevail. Numerous studies have reported the occurrence of continuous processes at moderate temperatures [6,18,19,21,22,[24][25][26]. More recently, the specific domains under which DDRX and CDRX predominate, have been associated to critical values of the Zener-Hollomon parameter (Z), as strain rate also plays a significant role (opposite to that of temperature) [29].…”