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Evaluating the room temperature ECAP processing of a NiTi alloy via simulation and experiments

Evaluating the room temperature ECAP processing of a NiTi alloy via simulation and experiments
Evaluating the room temperature ECAP processing of a NiTi alloy via simulation and experiments
The NiTi alloys are generally considered hard-to-deform materials when processing by equal-channel angular pressing (ECAP) at room temperature. Nevertheless, it is shown by experiment that a NiTi alloy may be successfully processed by ECAP for up to two passes using a core–sheath configuration. Three-dimensional finite element simulations were used to more fully evaluate the flow behavior after the first and second pass of ECAP. The values of the microhardness were recorded across transverse directions within the cores and the results show that the imposed strain both decreases by comparison with the processing of conventional sheath-free NiTi billet and increases by increasing the dimensions of the core. The lower areas of the cores undergo less deformation than the upper areas after successful ECAP processing but the imposed strain, and thus the microhardness values, become homogeneously distributed on the longitudinal planes after two passes of ECAP.
1438-1656
532-538
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Mansouri-Arani, Mojtaba
11fcd10a-d206-4e25-bc56-efc90a14034f
Khajezade, Ali
3749be39-fcd7-473f-9e7d-e1f607e39469
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Mansouri-Arani, Mojtaba
11fcd10a-d206-4e25-bc56-efc90a14034f
Khajezade, Ali
3749be39-fcd7-473f-9e7d-e1f607e39469
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Shahmir, Hamed, Nili-Ahmadabadi, Mahmoud, Mansouri-Arani, Mojtaba, Khajezade, Ali and Langdon, Terence G. (2015) Evaluating the room temperature ECAP processing of a NiTi alloy via simulation and experiments. Advanced Engineering Materials, 17 (4), 532-538. (doi:10.1002/adem.201400248).

Record type: Article

Abstract

The NiTi alloys are generally considered hard-to-deform materials when processing by equal-channel angular pressing (ECAP) at room temperature. Nevertheless, it is shown by experiment that a NiTi alloy may be successfully processed by ECAP for up to two passes using a core–sheath configuration. Three-dimensional finite element simulations were used to more fully evaluate the flow behavior after the first and second pass of ECAP. The values of the microhardness were recorded across transverse directions within the cores and the results show that the imposed strain both decreases by comparison with the processing of conventional sheath-free NiTi billet and increases by increasing the dimensions of the core. The lower areas of the cores undergo less deformation than the upper areas after successful ECAP processing but the imposed strain, and thus the microhardness values, become homogeneously distributed on the longitudinal planes after two passes of ECAP.

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More information

e-pub ahead of print date: 19 July 2014
Published date: 2 April 2015
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 377272
URI: http://eprints.soton.ac.uk/id/eprint/377272
ISSN: 1438-1656
PURE UUID: ec50f7f9-402b-48d7-9d02-3d4694754007
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 20 May 2015 14:54
Last modified: 15 Mar 2024 03:14

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Contributors

Author: Hamed Shahmir
Author: Mahmoud Nili-Ahmadabadi
Author: Mojtaba Mansouri-Arani
Author: Ali Khajezade

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