Improving the ductility of Mg-2.5Nd-0.5Zn-0.5Zr alloy by multi-pass hot rolling

Abstract

Fine-grained, high-strength and high-ductility Mg-2.5Nd-0.5Zn-0.5Zr alloy sheets were prepared by multi-pass hot rolling with ultimate tensile strength of 311.9 MPa, yield strength of 272.4 MPa, elongation of 17.1%, and the average grain size of 4.25 μm. After multi-pass hot rolling, all plates showed the characteristics of bimodal rolling direction-tilt texture (with the basal poles tilting at about ±15–20° form normal direction towards rolling direction). With the increase of rolling passes, the basal texture strength decreased gradually, which was 9.5 (1st pass), 7.5 (2nd pass) and 5.4 (3rd pass), respectively. The ductility improvement was the result of the interaction of texture weakening, basal slip and non-basal slip actuation.

Keywords

• Mg-2.5Nd-0.5Zn-0.5Zr alloy
• Mechanical properties
• Ductility
• Multi-pass hot rolling