4. Discussion
Due to the low stacking fault energy of Mg-Li alloy, rolling
deformation of the alloy is given priority to DRX (dynamic
recrystallization). Ma et al. [13] shows that new grains generated
by DRX with a low dislocation density also participate in
the texture evolution as the strain increases.
In this study, the rolling temperature is 373K, which is lower
than the recrystallization temperature. However, alloys containing
rare earth elements and/or yttrium (RE/Y) can develop
more random textures [14]. The addition of Y causes the formation of Al2Y phase. The particles of Al2Y compound in magnesium alloys can promote DRX during the process of
rolling and provide more approaches for nucleation of DRX
texture, weakening the basal texture. PSN (particle stimulated
nucleation) is the reason of weakening the basal texture. In
addition, the rare earth elements atoms that solute in magnesium
alloy will not only change the bond energy of RE-Mg and
Mg-Mg around rare earth atoms, but also change the stacking
fault energy of basal and non-basal planes, thus changing CRSS
(critical shear stress) of the basal and non-basal slip systems,
narrowing extended dislocation and causing it being easily
trapped into perfect dislocation [15]. Therefore, the non-basal
slip system can be activated easily.