期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.07.018
关键词
Al-Mg alloy; Annealing; Hardness; High-pressure torsion; Portevin-Le Chatelier effect
类别
资金
- European Research Council under ERC [267464-SPDMETALS]
- Hungarian Scientific Research Fund, OTKA [K-109021]
An Al-1% Mg solid solution alloy with an annealed grain size of similar to 400 mu m was processed by high-pressure torsion (HPT) to produce a grain size of similar to 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 similar to 360 nm, reduced the overall strength to a value that was similar to 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. (C) 2014 Elsevier B.V. All rights reserved.
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