Effect of short-term annealing on the microstructures and flow properties of an Al-1% Mg alloy processed by high-pressure torsion

Andreau, Olivier, Gubicza, Jenő, Zhang, Nian Xian, Huang, Yi, Jenei, Péter and Langdon, Terence G. (2014) Effect of short-term annealing on the microstructures and flow properties of an Al-1% Mg alloy processed by high-pressure torsion. Materials Science and Engineering: A, 615, 231-239. (doi:10.1016/j.msea.2014.07.018).

Abstract

An Al-1% Mg solid solution alloy with an annealed grain size of ~400 ?m was processed by high-pressure torsion (HPT) to produce a grain size of ~200 nm with a high fraction of high-angle grain boundaries. Tensile testing at room temperature showed this material exhibited excellent strength but with little or no ductility. It is demonstrated that a combination of reasonable ductility and good strength may be achieved by subjecting samples to a short term anneal of 10 minutes following the HPT processing. Annealing at 423 K increased the average grain size to ~360 nm, reduced the overall strength to a value that was ~75% of the value without annealing but gave reasonable elongations of up to >0.2. Both the initial unprocessed Al-Mg alloy and the sample annealed after HPT exhibited serrated flow due to the Portevin-Le Chatelier (PLC) effect. The results suggest that the introduction of short term annealing after HPT processing may be an effective and simple procedure for achieving a reasonable level of strength together with good ductility after processing by HPT

This record has no associated files available for download.

Contributors

Author: Yi Huang

Author: Terence G. Langdon

Download statistics