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Using high-pressure torsion to achieve superplasticity in an AZ91 magnesium alloy

Using high-pressure torsion to achieve superplasticity in an AZ91 magnesium alloy
Using high-pressure torsion to achieve superplasticity in an AZ91 magnesium alloy
An AZ91 magnesium alloy (Mg-9% Al-1% Zn) was processed by high-pressure torsion (HPT) after a solution heat treatment. Tensile tests were carried out at 423, 523 and 623 K in the strain rate range of 10-5 – 10-1 s-1 to evaluate the occurrence of superplasticity. The results show that HPT processing refines the grain structure in this alloy and grain sizes smaller than 10 µm are retained up to 623 K. Superplastic elongations were observed at low strain rates at 423 K and at all strain rates at 523 K. An examination of the experimental data shows good agreement with the theoretical prediction for grain boundary sliding which is the rate-controlling mechanism for superplasticity. Elongations in the range of 300% - 400% were observed at 623 K and this is attributed to a combination of grain boundary sliding and dislocation climb mechanisms. Keywords: creep; high-pressure torsion; magnesium; superplasticity
creep, high-pressure torsion (HPT), Magnesium, superplasicity
2075-4701
1-10
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Figueiredo, Roberto B. and Langdon, Terence G. (2020) Using high-pressure torsion to achieve superplasticity in an AZ91 magnesium alloy. Metals, 10 (5), 1-10, [681]. (doi:10.3390/met10050681).

Record type: Article

Abstract

An AZ91 magnesium alloy (Mg-9% Al-1% Zn) was processed by high-pressure torsion (HPT) after a solution heat treatment. Tensile tests were carried out at 423, 523 and 623 K in the strain rate range of 10-5 – 10-1 s-1 to evaluate the occurrence of superplasticity. The results show that HPT processing refines the grain structure in this alloy and grain sizes smaller than 10 µm are retained up to 623 K. Superplastic elongations were observed at low strain rates at 423 K and at all strain rates at 523 K. An examination of the experimental data shows good agreement with the theoretical prediction for grain boundary sliding which is the rate-controlling mechanism for superplasticity. Elongations in the range of 300% - 400% were observed at 623 K and this is attributed to a combination of grain boundary sliding and dislocation climb mechanisms. Keywords: creep; high-pressure torsion; magnesium; superplasticity

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Figueiredo and Langdon_Metals_accepted - Accepted Manuscript
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Accepted/In Press date: 19 May 2020
Published date: 22 May 2020
Keywords: creep, high-pressure torsion (HPT), Magnesium, superplasicity

Identifiers

Local EPrints ID: 441766
URI: http://eprints.soton.ac.uk/id/eprint/441766
ISSN: 2075-4701
PURE UUID: 4b22ff48-65e7-4888-9061-f59d8550716e
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 25 Jun 2020 16:48
Last modified: 07 Oct 2020 01:47

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