Overview: using severe plastic deformation in the processing of superplastic materials
Overview: using severe plastic deformation in the processing of superplastic materials
In tensile testing, polycrystalline materials generally fail at relatively low total elongations but under some limited conditions it is possible to achieve exceptionally high elongations of up to and exceeding 400%. This superplastic condition is important scientifically but also it has important uses through the industrial development of superplastic forming operations. This overview traces the historical development of this superplastic effect and it provides a summary of the main characteristics of the superplastic flow process. Conventional thermomechanical processing is not able to produce exceptionally small grain sizes within the submicrometer or nanometer range but this limitation was effectively overcome through processing using severe plastic deformation (SPD). The advantages of SPD processing are discussed and examples are presented. Finally it is demonstrated that the experimental data may be easily and effectively displayed through the construction of deformation mechanism maps based on combinations of stress, grain size and temperature.
creep, deformation mechanism maps, flow mechanisms, grain boundary sliding, superplasticity
1299-1305
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 July 2023
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Langdon, Terence G.
(2023)
Overview: using severe plastic deformation in the processing of superplastic materials.
Materials Transactions, 64 (7), .
(doi:10.2320/matertrans.MT-MF2022021).
Abstract
In tensile testing, polycrystalline materials generally fail at relatively low total elongations but under some limited conditions it is possible to achieve exceptionally high elongations of up to and exceeding 400%. This superplastic condition is important scientifically but also it has important uses through the industrial development of superplastic forming operations. This overview traces the historical development of this superplastic effect and it provides a summary of the main characteristics of the superplastic flow process. Conventional thermomechanical processing is not able to produce exceptionally small grain sizes within the submicrometer or nanometer range but this limitation was effectively overcome through processing using severe plastic deformation (SPD). The advantages of SPD processing are discussed and examples are presented. Finally it is demonstrated that the experimental data may be easily and effectively displayed through the construction of deformation mechanism maps based on combinations of stress, grain size and temperature.
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Accepted/In Press date: 6 March 2023
e-pub ahead of print date: 12 May 2023
Published date: 1 July 2023
Additional Information:
Funding Information:
This work was supported by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.
Publisher Copyright:
©2023 The Japan Institute of Metals and Materials.
Keywords:
creep, deformation mechanism maps, flow mechanisms, grain boundary sliding, superplasticity
Identifiers
Local EPrints ID: 482881
URI: http://eprints.soton.ac.uk/id/eprint/482881
ISSN: 1347-5320
PURE UUID: 70624b85-f71b-408f-bae1-d4047b13b9e3
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Date deposited: 16 Oct 2023 16:47
Last modified: 18 Mar 2024 02:56
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