Shape memory effect of NiTi alloy processed by equal-channel angular pressing followed by post deformation annealing
Shape memory effect of NiTi alloy processed by equal-channel angular pressing followed by post deformation annealing
Processing by Equal-Channel Angular Pressing (ECAP) is generally considered superior to most other SPD techniques because it uses relatively large bulk samples. However, due to their low deformability it has proven almost impossible to successfully process NiTi alloys by ECAP at room temperature and therefore the processing is conducted at elevated temperatures. Recently, a new billet design was introduced and it was used to achieve the successful processing of NiTi shape memory alloys by ECAP. In this procedure, a NiTi alloy was inserted as a core within an Fe sheath to give a core-sheath billet. In this research, a NiTi was processed by one pass ECAP with this new billet design at room temperature. The structural evolution during annealing was investigated by X-ray diffraction (XRD) and microhardness measurements. Post deformation annealing (PDA) was carried out at 400°C for 5 to 300 min and the results indicate that the shape memory effect improves by PDA after ECAP
12111
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
July 2014
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-Ahmadabadi, Mahmoud
74c5b0be-a73e-40fe-bc6e-8450bc0eeaf7
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed, Nili-Ahmadabadi, Mahmoud and Langdon, Terence G.
(2014)
Shape memory effect of NiTi alloy processed by equal-channel angular pressing followed by post deformation annealing.
IOP Conference Series: Materials Science and Engineering, 63, .
(doi:10.1088/1757-899X/63/1/012111).
Abstract
Processing by Equal-Channel Angular Pressing (ECAP) is generally considered superior to most other SPD techniques because it uses relatively large bulk samples. However, due to their low deformability it has proven almost impossible to successfully process NiTi alloys by ECAP at room temperature and therefore the processing is conducted at elevated temperatures. Recently, a new billet design was introduced and it was used to achieve the successful processing of NiTi shape memory alloys by ECAP. In this procedure, a NiTi alloy was inserted as a core within an Fe sheath to give a core-sheath billet. In this research, a NiTi was processed by one pass ECAP with this new billet design at room temperature. The structural evolution during annealing was investigated by X-ray diffraction (XRD) and microhardness measurements. Post deformation annealing (PDA) was carried out at 400°C for 5 to 300 min and the results indicate that the shape memory effect improves by PDA after ECAP
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Published date: July 2014
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 368102
URI: http://eprints.soton.ac.uk/id/eprint/368102
ISSN: 1757-899X
PURE UUID: 5e000d5b-54bc-46fc-888e-53a245e55d0f
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Date deposited: 12 Sep 2014 13:30
Last modified: 15 Mar 2024 03:13
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Author:
Hamed Shahmir
Author:
Mahmoud Nili-Ahmadabadi
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