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Using post-deformation annealing to optimize the properties of a ZK60 magnesium alloy processed by high-pressure torsion

Using post-deformation annealing to optimize the properties of a ZK60 magnesium alloy processed by high-pressure torsion

Authors :
Shima Sabbaghianrad
Seyed Alireza Torbati-Sarraf
Terence G. Langdon
Publication Year :
2018

Abstract

A ZK60 magnesium alloy with an initial grain size of ~10 μm was processed by high-pressure torsion (HPT) through 5 revolutions under a constant compressive pressure of 2.0 GPa with a rotation speed of 1 rpm. An average grain size of ~700 nm was achieved after HPT with a high fraction of high-angle grain boundaries. Tensile experiments at room temperature showedpoor ductility. However, a combination of reasonable ductility and good strength was achieved with post-HPT annealing by subjecting samples to high temperatures in the range of 473 to 548 K for 10 or 20 min. The grain size and texture changes were also examined by electron back scattereddiffraction (EBSD) and the results compared to long-term annealing for 2500 min at 450 K. The results of this study suggest that a post-HPT annealing for a short period of time may be effective in achieving a reasonable combination of strength and ductility.

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....02a2df02800e3706b5735d6029d383f3