Annealing behavior and shape memory effect in NiTi alloy processed by equal-channel angular pressing at room temperature
Annealing behavior and shape memory effect in NiTi alloy processed by equal-channel angular pressing at room temperature
A martensitic NiTi shape memory alloy was processed successfully by equal-channel angular pressing (ECAP) for one pass at room temperature using a core–sheath billet design. The annealing behavior and shape memory effect of the ECAP specimens were studied followed by post-deformation annealing (PDA) at 673 K for various times. The recrystallization and structural evolution during annealing were investigated by differential scanning calorimetry, dilatometry, X-ray diffraction, transmission electron microscopy and microhardness measurements. The results indicate that the shape memory effect improves by PDA after ECAP processing. Annealing for 10 min gives a good shape memory effect which leads to a maximum in recoverable strain of 6.9 pct upon heating where this is more than a 25 pct improvement compared with the initial state.
shape memory effect, equal-channel angular pressing, NiTi shape memory alloys, ultrafine-grained materials
16-22
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Wang, Chuan Ting
80ad9adf-a9df-49ed-934d-fa64505b920d
Jung, Jai Myun
6ff124aa-278d-4a4c-b653-a94a3e1e2335
Kim, Hyoung Seop
762e00dc-3fa4-49ec-85d5-0f5bab01399b
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 April 2015
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Wang, Chuan Ting
80ad9adf-a9df-49ed-934d-fa64505b920d
Jung, Jai Myun
6ff124aa-278d-4a4c-b653-a94a3e1e2335
Kim, Hyoung Seop
762e00dc-3fa4-49ec-85d5-0f5bab01399b
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed, Nili-Ahmadabadi, Mahmoud, Wang, Chuan Ting, Jung, Jai Myun, Kim, Hyoung Seop and Langdon, Terence G.
(2015)
Annealing behavior and shape memory effect in NiTi alloy processed by equal-channel angular pressing at room temperature.
Materials Science and Engineering: A, 629, .
(doi:10.1016/j.msea.2015.01.072).
Abstract
A martensitic NiTi shape memory alloy was processed successfully by equal-channel angular pressing (ECAP) for one pass at room temperature using a core–sheath billet design. The annealing behavior and shape memory effect of the ECAP specimens were studied followed by post-deformation annealing (PDA) at 673 K for various times. The recrystallization and structural evolution during annealing were investigated by differential scanning calorimetry, dilatometry, X-ray diffraction, transmission electron microscopy and microhardness measurements. The results indicate that the shape memory effect improves by PDA after ECAP processing. Annealing for 10 min gives a good shape memory effect which leads to a maximum in recoverable strain of 6.9 pct upon heating where this is more than a 25 pct improvement compared with the initial state.
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More information
Accepted/In Press date: 28 January 2015
e-pub ahead of print date: 4 February 2015
Published date: 1 April 2015
Keywords:
shape memory effect, equal-channel angular pressing, NiTi shape memory alloys, ultrafine-grained materials
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 377255
URI: http://eprints.soton.ac.uk/id/eprint/377255
ISSN: 0921-5093
PURE UUID: d26de9a7-7090-4d0e-b798-a4cb1214d82f
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Date deposited: 20 May 2015 14:47
Last modified: 15 Mar 2024 03:14
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Author:
Hamed Shahmir
Author:
Mahmoud Nili-Ahmadabadi
Author:
Chuan Ting Wang
Author:
Jai Myun Jung
Author:
Hyoung Seop Kim
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