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Examining the mechanical properties and superplastic behaviour in an Al-Mg-Sc alloy after processing by HPT

Examining the mechanical properties and superplastic behaviour in an Al-Mg-Sc alloy after processing by HPT
Examining the mechanical properties and superplastic behaviour in an Al-Mg-Sc alloy after processing by HPT
Experiments were conducted using the solution treated Al-3 % Mg-0.2 % Sc alloy in order to examine the mechanical properties and superplastic behaviour after processing by high-pressure torsion. Hardness values of ~200 Hv were detected in the edge of the samples after 10 turns of HPT, although the microhardness distribution was inhomogeneous along the diameter of the discs. Excellent superplastic properties were achieved in this Al alloy after HPT processing and further tensile testing at temperatures over the range from 523 to 673 K, demonstrating good agreement with the theoretical model for grain boundary sliding. High strain rate superplasticity was consistently observed at temperatures from 573 to 623 K, with elongations to failure up to ~800 % at 573 K and at a strain rate of 1.4×10-2 s-1. Further analysis of the experimental data revealed that the stress exponent at the testing conditions displaying elongations >400 % was ~2 thereby demonstrating good agreement with the theoretical model for grain boundary sliding. The calculated activation energies lie in the range from ~98 to ~118 kJ mol-1 and are similar to the value obtained for the same alloy after ECAP which is within the range for grain boundary diffusion in pure Al and interdiffusion in Al-Mg alloys
2218-5046
294-300
Pereira, P.H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Y.
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Pereira, P.H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Y.
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Pereira, P.H.R., Huang, Y. and Langdon, T.G. (2015) Examining the mechanical properties and superplastic behaviour in an Al-Mg-Sc alloy after processing by HPT. Letters on Materials, 5 (3), 294-300.

Record type: Article

Abstract

Experiments were conducted using the solution treated Al-3 % Mg-0.2 % Sc alloy in order to examine the mechanical properties and superplastic behaviour after processing by high-pressure torsion. Hardness values of ~200 Hv were detected in the edge of the samples after 10 turns of HPT, although the microhardness distribution was inhomogeneous along the diameter of the discs. Excellent superplastic properties were achieved in this Al alloy after HPT processing and further tensile testing at temperatures over the range from 523 to 673 K, demonstrating good agreement with the theoretical model for grain boundary sliding. High strain rate superplasticity was consistently observed at temperatures from 573 to 623 K, with elongations to failure up to ~800 % at 573 K and at a strain rate of 1.4×10-2 s-1. Further analysis of the experimental data revealed that the stress exponent at the testing conditions displaying elongations >400 % was ~2 thereby demonstrating good agreement with the theoretical model for grain boundary sliding. The calculated activation energies lie in the range from ~98 to ~118 kJ mol-1 and are similar to the value obtained for the same alloy after ECAP which is within the range for grain boundary diffusion in pure Al and interdiffusion in Al-Mg alloys

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More information

Published date: August 2015
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 380481
URI: http://eprints.soton.ac.uk/id/eprint/380481
ISSN: 2218-5046
PURE UUID: 4fc5ba15-99f0-4b01-a93c-25484a4b5e4a
ORCID for Y. Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 11 Sep 2015 10:42
Last modified: 09 Jan 2022 03:37

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Contributors

Author: P.H.R. Pereira
Author: Y. Huang ORCID iD
Author: T.G. Langdon ORCID iD

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