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Rapid synthesis of an extra hard metal matrix nanocomposite at ambient temperature

Rapid synthesis of an extra hard metal matrix nanocomposite at ambient temperature
Rapid synthesis of an extra hard metal matrix nanocomposite at ambient temperature
The strengthening of metals is essentially controlled by the microstructures of the metal solids and it is well understood that smaller grain sizes lead to higher hardness and increased strength. Nevertheless, true bulk nanostructured materials are difficult to produce using established engineering techniques, especially when considering the practical and societal needs of materials selection. Lightweight Al and Mg are conventional metals having excellent physico-chemical and mechanical properties and with good strength/weight ratios in the finished products. However, the fabrication of high-strength metals consisting of these elements, using mechanical alloying and milling and cladding-type metal working, generally involves long-term processing conducted under extreme conditions using special facilities. The present study demonstrates the very rapid synthesis of a metal matrix nanocomposite (MMNC) of the Al–Mg system which was achieved by stacking metal disks of the two pure metals and processing by high-pressure torsion at ambient temperature for 10 turns. An exceptionally high hardness was achieved, similar to many steels, through rapid stress-induced diffusion of Mg and the simultaneous formation of intermetallic nano-layers and a nanostructured intermetallic compound with a supersaturated solid solution. This unexpected result suggests a potential for simply and expeditiously fabricating a wide range of MMNCs.
Al–Mg, hardness, high-pressure torsion, intermetallic compound, severe plastic deformation
0921-5093
109-117
Ahn, Byungmin
92fd09aa-9424-4020-ae74-02dd129f470f
Zhilyaev, Alexander P.
d053e518-1976-4633-8953-e8f34b9b7c44
Lee, Han-Joo
dfea332e-c7bd-49d9-b544-c62baab464bf
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Ahn, Byungmin
92fd09aa-9424-4020-ae74-02dd129f470f
Zhilyaev, Alexander P.
d053e518-1976-4633-8953-e8f34b9b7c44
Lee, Han-Joo
dfea332e-c7bd-49d9-b544-c62baab464bf
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Ahn, Byungmin, Zhilyaev, Alexander P., Lee, Han-Joo, Kawasaki, Megumi and Langdon, Terence G. (2015) Rapid synthesis of an extra hard metal matrix nanocomposite at ambient temperature. Materials Science and Engineering: A, 635, 109-117. (doi:10.1016/j.msea.2015.03.042).

Record type: Article

Abstract

The strengthening of metals is essentially controlled by the microstructures of the metal solids and it is well understood that smaller grain sizes lead to higher hardness and increased strength. Nevertheless, true bulk nanostructured materials are difficult to produce using established engineering techniques, especially when considering the practical and societal needs of materials selection. Lightweight Al and Mg are conventional metals having excellent physico-chemical and mechanical properties and with good strength/weight ratios in the finished products. However, the fabrication of high-strength metals consisting of these elements, using mechanical alloying and milling and cladding-type metal working, generally involves long-term processing conducted under extreme conditions using special facilities. The present study demonstrates the very rapid synthesis of a metal matrix nanocomposite (MMNC) of the Al–Mg system which was achieved by stacking metal disks of the two pure metals and processing by high-pressure torsion at ambient temperature for 10 turns. An exceptionally high hardness was achieved, similar to many steels, through rapid stress-induced diffusion of Mg and the simultaneous formation of intermetallic nano-layers and a nanostructured intermetallic compound with a supersaturated solid solution. This unexpected result suggests a potential for simply and expeditiously fabricating a wide range of MMNCs.

Full text not available from this repository.

More information

Accepted/In Press date: 11 March 2015
e-pub ahead of print date: 20 March 2015
Published date: 21 May 2015
Keywords: Al–Mg, hardness, high-pressure torsion, intermetallic compound, severe plastic deformation
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 377251
URI: https://eprints.soton.ac.uk/id/eprint/377251
ISSN: 0921-5093
PURE UUID: 8354ce54-62c2-4774-9dae-bdb699d71feb
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 20 May 2015 10:15
Last modified: 31 Jul 2019 00:44

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