Influence of Torsion Route on the Microstructure and Mechanical Properties of Extruded AZ31 Rods

Abstract

Torsion deformation is an effective and simple technique to tailor the mechanical properties of Mg alloys. In this study, the influences of torsion route on microstructure and mechanical properties of AZ31 rods are investigated. The maximum torsion angle is set as 180 and the two-pass torsion at different torsion routes, twice-successive unidirectional torsion (T A ) and reciprocating torsion (T B ), is used to process the Mg alloy rods. It is found that the mechanical properties and yield asymmetry are very sensitive to the torsion route. Route T A is more effective for the enhancement of compressive yield strength and the improvement of yield asymmetry, while route T B is more effective for the enhancement of tensile yield strength. It is mainly attributed to the different textural evolutions between the two torsion routes. The relevant mechanisms are addressed and discussed. Experimental SectionExtruded AZ31 magnesium alloy rods with a diameter of 16 mm were subjected to free-end torsion deformation. Dog-bone-shaped specimens with a gauge length as Ф 6 Â 28 mm

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