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Using severe plastic deformation for the processing of advanced engineering materials

Using severe plastic deformation for the processing of advanced engineering materials
Using severe plastic deformation for the processing of advanced engineering materials
The processing of metals through the application of severe plastic deformation leads to significant grain refinement and provides an opportunity for achieving superior properties. The two procedures of equal-channel angular pressing (ECAP) and high-pressure torsion (HPT) are examined with emphasis on the mechanical properties at low and high temperatures and the nature of the grain refinement. It is demonstrated that grain refinement occurs relatively homogeneously in f.c.c metals through the formation of dislocation cells or subgrains and the evolution of these cells into an array of ultrafine grains separated by high angle boundaries. By contrast, grain refinement in h.c.p. metals such as magnesium is inhomogeneous and occurs through the nucleation of new grains along the initial grain boundaries due to the high stresses generated to activate multiple slip systems. Ultrafine-grained metals generally exhibit high strength but they may exhibit weakening if the processing conditions adversely affect the precipitate morphology. If the ultrafine grains are stable at high temperatures there is a possibility of achieving excellent superplastic properties
1347-5320
1613-1619
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Figueiredo, Roberto B. and Langdon, Terence G. (2009) Using severe plastic deformation for the processing of advanced engineering materials. Materials Transactions, 50 (7), 1613-1619.

Record type: Article

Abstract

The processing of metals through the application of severe plastic deformation leads to significant grain refinement and provides an opportunity for achieving superior properties. The two procedures of equal-channel angular pressing (ECAP) and high-pressure torsion (HPT) are examined with emphasis on the mechanical properties at low and high temperatures and the nature of the grain refinement. It is demonstrated that grain refinement occurs relatively homogeneously in f.c.c metals through the formation of dislocation cells or subgrains and the evolution of these cells into an array of ultrafine grains separated by high angle boundaries. By contrast, grain refinement in h.c.p. metals such as magnesium is inhomogeneous and occurs through the nucleation of new grains along the initial grain boundaries due to the high stresses generated to activate multiple slip systems. Ultrafine-grained metals generally exhibit high strength but they may exhibit weakening if the processing conditions adversely affect the precipitate morphology. If the ultrafine grains are stable at high temperatures there is a possibility of achieving excellent superplastic properties

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More information

Published date: 2009
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 72193
URI: https://eprints.soton.ac.uk/id/eprint/72193
ISSN: 1347-5320
PURE UUID: 7389ed26-1c7f-4a2a-b922-d8f20f969242
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 29 Jan 2010
Last modified: 20 Jul 2019 01:03

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Contributors

Author: Roberto B. Figueiredo

University divisions

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