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Effect of cumulative area reduction on deformation behavior and mechanical properties of Mg-Gd-Y-Zn-Zr alloy wires by hot drawing
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DOI：10.1016/j.mtla.2026.102815.png)
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Abstract
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The effect of cumulative area reduction (CAR) on the deformation behavior and mechanical properties of Mg-9.0Gd-3.0Y-1.0Zn-0.4Zr alloy wires during hot drawing was systematically investigated. Using as-extruded wires with a diameter of 5 mm as the initial material, drawn wires with a diameter of 1.4 mm were fabricated via multi-pass hot drawing with a single-pass reduction of 12–15% and temperature of 400–450 °C. Primary phases in the wires were intergranular 18R-long period stacking ordered (LPSO) phase, intragranular 14H-LPSO phase, and (Gd,Y)H2 phase. As CAR increased, the dislocation density rose correspondingly, and continuous dynamic recrystallization occurred in the alloy wires. During hot drawing, plastic deformation was primarily dominated by both basal <a> slip and pyramidal <c+a> slip. Because of the grain rotation induced by basal <a> slip and preferential grain growth under thermal activation, the wire texture transformed from the initial extrusion texture with <0001> parallel to the extrusion direction to the fiber texture with <01−10> parallel to the drawing direction. Owing to the combined effects of the LPSO phases, dislocation hardening, and texture strengthening, the ultimate tensile strength, tensile yield strength, and tensile elongation of the Φ1.4 mm wires reached 436 MPa, 412 MPa, and 4.1%, respectively.
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