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Developing superplasticity in an aluminum matrix composite processed by high-pressure torsion

Developing superplasticity in an aluminum matrix composite processed by high-pressure torsion
Developing superplasticity in an aluminum matrix composite processed by high-pressure torsion
An Al-7075 alloy reinforced with 10 vol% Al2O3 particulates was processed by high-pressure torsion (HPT) at room temperature under a pressure of 6.0 GPa through up to 20 turns. The metal matrix composite (MMC) showed significant grain refinement from an initial average grain size of ~8 ?m to ~300 nm after processing by HPT through 20 turns. The Vickers microhardness also increased from an initial value of Hv?167 to a saturation value after HPT processing of Hv?260. Tensile testing at 623 K demonstrated the potential for achieving true superplasticity in the HPT-processed MMC with a maximum elongation of ~670% when testing at a strain rate of 1.0×10?2 s?1.
Al-7075 alloy, hardness, high-pressure torsion, metal matrix composite, superplasticity
0921-5093
36-43
Sabbaghianrad, S.
a061a940-ba10-4c18-945c-142464addb36
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Sabbaghianrad, S.
a061a940-ba10-4c18-945c-142464addb36
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Sabbaghianrad, S. and Langdon, T.G. (2016) Developing superplasticity in an aluminum matrix composite processed by high-pressure torsion. Materials Science and Engineering: A, 655, 36-43. (doi:10.1016/j.msea.2015.12.078).

Record type: Article

Abstract

An Al-7075 alloy reinforced with 10 vol% Al2O3 particulates was processed by high-pressure torsion (HPT) at room temperature under a pressure of 6.0 GPa through up to 20 turns. The metal matrix composite (MMC) showed significant grain refinement from an initial average grain size of ~8 ?m to ~300 nm after processing by HPT through 20 turns. The Vickers microhardness also increased from an initial value of Hv?167 to a saturation value after HPT processing of Hv?260. Tensile testing at 623 K demonstrated the potential for achieving true superplasticity in the HPT-processed MMC with a maximum elongation of ~670% when testing at a strain rate of 1.0×10?2 s?1.

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More information

Accepted/In Press date: 23 December 2015
e-pub ahead of print date: 24 December 2015
Published date: 8 February 2016
Keywords: Al-7075 alloy, hardness, high-pressure torsion, metal matrix composite, superplasticity
Organisations: Engineering Mats & Surface Engineerg Gp, Engineering Science Unit, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 386302
URI: http://eprints.soton.ac.uk/id/eprint/386302
ISSN: 0921-5093
PURE UUID: 19a21a16-0c1e-41d5-850f-46d9f882e836
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 29 Jan 2016 15:40
Last modified: 17 Dec 2019 01:50

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