Using Post-Deformation Annealing to Optimize the Properties of a ZK60 Magnesium Alloy Processed by High-Pressure Torsion

作者：Torbati-Sarraf Seyed A.^*; Sabbaghianrad Shima; Langdon Terence G.

来源：Advanced Engineering Materials, 2018, 20(2): 1700703.

DOI：10.1002/adem.201700703

• ductility
• high-pressure torsion
• post-deformation annealing
• ultrafine grain size
• ZK60 magnesium alloy

A ZK60 magnesium alloy with an initial grain size of approximate to 10 mu m is processed by high-pressure torsion (HPT) through 5 revolutions under a constant compressive pressure of 2.0GPa with a rotation speed of 1rpm. An average grain size of approximate to 700nm is achieved after HPT with a high fraction of high-angle grain boundaries. Tensile experiments at room temperature show poor ductility. However, a combination of reasonable ductility and good strength is achieved with post-HPT annealing by subjecting samples to high temperatures in the range of 473-548K for 10 or 20min. The grain size and texture changes are also examined by electron back scattered diffraction (EBSD) and the results compared to long-term annealing for 2500min at 450K. 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.

• 出版日期2018-2