Abstract
The microstructure and mechanical properties of the hot-rolled and cryo-rolled Mg-2Zn-0.85Y (wt.%) alloys before and after annealing were studied comparatively. The results show that the cryo-rolled alloy after annealing exhibits a strength and plasticity product of up to 6885 MPa·%, which is the highest among these alloys. The good combination of strength and ductility is mainly attributed to the bimodal grain structure with a weakened texture. Recrystallization primarily occurs in grains with <112¯0>/30.1° twinning, but not in the grains without <112¯0>/30.1° twinning, resulting in the formation of the bimodal structure. The cryo-rolling process could become a promising method for regulating the microstructure and properties of magnesium alloys.
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