Texture weakening mediated by designed low-temperature rolling in a dilute magnesium alloy

High-temperature rolling effectively weakens the texture of Mg sheets, but it leads to grain coarsening and high energy cost. This study introduces a low-temperature (100 °C) rolling in dilute Mg-1Zn-1Sn-0.2Ca (ZTX110) alloy capable of achieving weakened texture. Zn/Sn/Ca additions promote the accumulation of high-energy dislocations near high-density deformation twins and shear bands. This enhances the driving force for twinning and shear band-induced recrystallization in the subsequent annealing, thus substantially expanding randomly-oriented grains and weakening texture. During early annealing stage, initially segregated Zn atoms at twin boundaries migrate into the matrix mediated by residual dislocations, reducing solute drag and facilitating growth of randomly-oriented grains. Upon complete consumption of residual dislocations as recrystallization progresses, Zn atoms gradually re-segregate to grain boundaries of newly nucleated random grains, suppressing grain coarsening. These findings reveal a designed rolling regime enabling texture weakening of Mg sheets by activating profuse dislocations and dynamic solute partitioning.