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Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding
Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding
Disks of commercial Al-1050 and ZK60A alloys were stacked together and then processed by conventional high-pressure torsion (HPT) through 1 and 5 turns at room temperature to investigate the synthesis of an Al–Mg alloy system. Measurements of microhardness and observations of the microstructures and local compositions after processing through 5 turns revealed the formation of an ultrafine multi-layered structure in the central region of the disk but with an intermetallic ?-Al3Mg2 phase in the form of nano-layers in the nanostructured Al matrix near the edge of the disk. The activation energy for diffusion bonding of the Al and Mg phases was estimated and it is shown that this value is low and consistent with surface diffusion due to the very high density of vacancy-type defects introduced by HPT processing. The results demonstrate a significant potential for making use of HPT processing in the preparation of new alloy systems.
al–mg, diffusion bonding, high-pressure torsion, intermetallic compound, severe plastic deformation
88-99
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Ahn, Byungmin
92fd09aa-9424-4020-ae74-02dd129f470f
Lee, HanJoo
9fa15462-d29a-4fa2-9e8f-1eeb15293948
Zhilyaev, Alexander P.
13424aa4-7ee2-4f00-a3a7-91ad6dbd1ec8
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Ahn, Byungmin
92fd09aa-9424-4020-ae74-02dd129f470f
Lee, HanJoo
9fa15462-d29a-4fa2-9e8f-1eeb15293948
Zhilyaev, Alexander P.
13424aa4-7ee2-4f00-a3a7-91ad6dbd1ec8
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Kawasaki, Megumi, Ahn, Byungmin, Lee, HanJoo, Zhilyaev, Alexander P. and Langdon, Terence G. (2016) Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding. Journal of Materials Research, 31 (1), 88-99. (doi:10.1557/jmr.2015.257).

Record type: Article

Abstract

Disks of commercial Al-1050 and ZK60A alloys were stacked together and then processed by conventional high-pressure torsion (HPT) through 1 and 5 turns at room temperature to investigate the synthesis of an Al–Mg alloy system. Measurements of microhardness and observations of the microstructures and local compositions after processing through 5 turns revealed the formation of an ultrafine multi-layered structure in the central region of the disk but with an intermetallic ?-Al3Mg2 phase in the form of nano-layers in the nanostructured Al matrix near the edge of the disk. The activation energy for diffusion bonding of the Al and Mg phases was estimated and it is shown that this value is low and consistent with surface diffusion due to the very high density of vacancy-type defects introduced by HPT processing. The results demonstrate a significant potential for making use of HPT processing in the preparation of new alloy systems.

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More information

Accepted/In Press date: 7 August 2015
e-pub ahead of print date: 2 November 2015
Published date: January 2016
Keywords: al–mg, diffusion bonding, high-pressure torsion, intermetallic compound, severe plastic deformation
Organisations: Engineering Mats & Surface Engineerg Gp, Engineering Science Unit, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 388011
URI: http://eprints.soton.ac.uk/id/eprint/388011
PURE UUID: e2682135-797d-40f9-95ca-23756afe3bcf
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

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

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