Achieving Superplastic Elongations in an AZ80 Magnesium Alloy Processed by High?Pressure Torsion

Processing magnesium alloy by High-Pressure Torsion (HPT) is a technique used successfully to refine the grains of an submicrometer and nanometer scale produce ultrafine grained microstructure. Grain refinement can improve mechanical properties alloys as well enhancing its ductility providing potential for exhibiting superplastic behaviour at elevated temperature. Research was conducted process AZ80 HPT room temperature different numbers turns with microstructures before after critically investigated using scanning electron microscopy (SEM), transmission (TEM) Vickers microhardness (Hv) tests. Subsequently, tensile specimens were cut from processed disks pulled in tension failure temperatures 473, 523 573 K strain rates range 1.4 × 10–4 10-1 s-1. The introduction superplasticity when processing demonstrated first time maximum elongation 645% testing K. There also evidence low 423% 473 dominant mechanism flow grain boundary sliding rate sensitivity m ? 0.5 activation energy Q 73 kJ mol-1. This article protected copyright. All rights reserved.