Low temperature superplasticity in ultrafine-grained AZ31 alloy
Low temperature superplasticity in ultrafine-grained AZ31 alloy
The mechanical behavior of an AZ31 magnesium alloy processed by high-pressure torsion (HPT) was evaluated by tensile testing from room temperature up to 473 K at strain rates between 10-5 – 10-2 s-1. Samples tested at room temperature and at high strain rates at 373 K failed without any plastic deformation. However, significant ductility, with elongations larger than 200%, was observed at 423 K and 473 K and at low strain rates at 373 K. The high elongations are attributed to a pronounced strain hardening and a high strain rate sensitivity. The results agree with reports for a similar alloy processed by severe plastic deformation. However, the level of flow stress is lower and the strain rate sensitivity and the elongations are larger than observed in this alloy processed by conventional thermo-mechanical processing.
59-64
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2018
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B., Pereira, Pedro H.R. and Langdon, Terence G.
(2018)
Low temperature superplasticity in ultrafine-grained AZ31 alloy.
Defect and Diffusion Forum, 385, .
(doi:10.4028/www.scientific.net/DDF.385.59).
Abstract
The mechanical behavior of an AZ31 magnesium alloy processed by high-pressure torsion (HPT) was evaluated by tensile testing from room temperature up to 473 K at strain rates between 10-5 – 10-2 s-1. Samples tested at room temperature and at high strain rates at 373 K failed without any plastic deformation. However, significant ductility, with elongations larger than 200%, was observed at 423 K and 473 K and at low strain rates at 373 K. The high elongations are attributed to a pronounced strain hardening and a high strain rate sensitivity. The results agree with reports for a similar alloy processed by severe plastic deformation. However, the level of flow stress is lower and the strain rate sensitivity and the elongations are larger than observed in this alloy processed by conventional thermo-mechanical processing.
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Accepted/In Press date: 13 April 2018
e-pub ahead of print date: 20 July 2018
Published date: 2018
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Local EPrints ID: 422803
URI: http://eprints.soton.ac.uk/id/eprint/422803
ISSN: 1012-0386
PURE UUID: e703b256-3535-4d49-aec6-450c542841fb
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Date deposited: 06 Aug 2018 16:30
Last modified: 16 Mar 2024 03:28
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Author:
Roberto B. Figueiredo
Author:
Pedro H.R. Pereira
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