Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7980037 | Materials Science and Engineering: A | 2014 | 30 Pages |
Abstract
An Al-1% Mg solid solution alloy with an annealed grain size of ~400 μm 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 min 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Olivier Andreau, JenÅ Gubicza, Nian Xian Zhang, Yi Huang, Péter Jenei, Terence G. Langdon,