Hardness Homogeneity in an AZ80 Magnesium Alloy Processed by High-Pressure Torsion

Abstract

Experiments were conducted on an AZ80 magnesium alloy by processing by high-pressure torsion (HPT) at room temperature (296 K) for up to 10 turns under an imposed pressure of 6.0 GPa. Measurements of the Vickers microhardness along diameters and through the disk thicknesses were recorded after HPT to evaluate the evolution towards homogeneity. The results show hardness increases up to a factor of approximately 2 and the deformation is more homogeneous along the disc diameter than through the thickness.

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

“…Accordingly, the present investigation was initiated to evaluate the potential for achieving superplastic flow in the AZ80 alloy after processing by HPT. Several useful reports are now available describing the evolution of microstructure and the development of hardness in the AZ80 alloy when processing by HPT and other SPD techniques [37][38][39][40][41][42][43][44]. Thus, in the present research disks of a commercial AZ80 alloy were processed by HPT to produce an ultrafine grain size and then tensile specimens were cut from the disks and pulled to failure over a range of strain rates and testing temperatures to evaluate the potential for achieving superplastic elongations.…”