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Effect of Cu on amorphization of a TiNi alloy during HPT and shape memory effect after post‐deformation annealing

Effect of Cu on amorphization of a TiNi alloy during HPT and shape memory effect after post‐deformation annealing
Effect of Cu on amorphization of a TiNi alloy during HPT and shape memory effect after post‐deformation annealing
A ternary TiNiCu shape memory alloy is subjected to high‐pressure torsion (HPT) followed by post‐deformation annealing (PDA) to study the effect of Cu (5 at%) on amorphization after HPT processing and to investigate the microstructural evolution and shape memory effect (SME) after PDA. The results show that even after 20 revolutions the ternary alloy contains nanocrystalline areas and the microstructure is not fully amorphous. An easier martensite‐to‐austenite transformation and minor remaining austenite in the ternary alloy are responsible for suppressing amorphization. Post‐deformation annealing at 673 K provides nanocrystalline microstructures containing an R‐phase with a minor martensitic B19' phase in the ternary alloy. The SME of this alloy after PDA is not as satisfactory as that of the binary alloy processed through similar conditions because of the existence of a high volume fraction of the R‐phase. However, the total recovered strain of the ternary alloy after PDA for 30 min has a maximum value of 6.5%.
HPT, TiNi alloy, effect of Cu, shape-memory effect
1438-1656
1-9
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-ahmadabadi, Mahmoud
5c3ad868-5e6a-4d12-9cab-aabaf36b3f7f
Mohammadi, Mahdi
9b39339a-255e-40a7-bf52-9043ab291e6b
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Andrzejczuk, Mariusz
8e090b03-8d58-41b3-906f-068a5ed2e9a8
Lewandowska, Małgorzata
a5f45b21-9af9-4dac-a0c0-5005c1431a02
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Nili-ahmadabadi, Mahmoud
5c3ad868-5e6a-4d12-9cab-aabaf36b3f7f
Mohammadi, Mahdi
9b39339a-255e-40a7-bf52-9043ab291e6b
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Andrzejczuk, Mariusz
8e090b03-8d58-41b3-906f-068a5ed2e9a8
Lewandowska, Małgorzata
a5f45b21-9af9-4dac-a0c0-5005c1431a02
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Shahmir, Hamed, Nili-ahmadabadi, Mahmoud, Mohammadi, Mahdi, Huang, Yi, Andrzejczuk, Mariusz, Lewandowska, Małgorzata and Langdon, Terence G. (2020) Effect of Cu on amorphization of a TiNi alloy during HPT and shape memory effect after post‐deformation annealing. Advanced Engineering Materials, 22 (1), 1-9, [1900387]. (doi:10.1002/adem.201900387).

Record type: Article

Abstract

A ternary TiNiCu shape memory alloy is subjected to high‐pressure torsion (HPT) followed by post‐deformation annealing (PDA) to study the effect of Cu (5 at%) on amorphization after HPT processing and to investigate the microstructural evolution and shape memory effect (SME) after PDA. The results show that even after 20 revolutions the ternary alloy contains nanocrystalline areas and the microstructure is not fully amorphous. An easier martensite‐to‐austenite transformation and minor remaining austenite in the ternary alloy are responsible for suppressing amorphization. Post‐deformation annealing at 673 K provides nanocrystalline microstructures containing an R‐phase with a minor martensitic B19' phase in the ternary alloy. The SME of this alloy after PDA is not as satisfactory as that of the binary alloy processed through similar conditions because of the existence of a high volume fraction of the R‐phase. However, the total recovered strain of the ternary alloy after PDA for 30 min has a maximum value of 6.5%.

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Shahmir-AEM-2020 - Accepted Manuscript
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More information

Accepted/In Press date: 20 April 2019
e-pub ahead of print date: 5 July 2019
Published date: 21 January 2020
Additional Information: Special Issue: Dedicated to Terence G. Langdon on the Occasion of his 80th Birthday
Keywords: HPT, TiNi alloy, effect of Cu, shape-memory effect

Identifiers

Local EPrints ID: 437618
URI: http://eprints.soton.ac.uk/id/eprint/437618
ISSN: 1438-1656
PURE UUID: 8391f187-9097-472b-a472-295eed69d3f0
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 06 Feb 2020 17:33
Last modified: 26 Nov 2021 05:17

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Contributors

Author: Hamed Shahmir
Author: Mahmoud Nili-ahmadabadi
Author: Mahdi Mohammadi
Author: Yi Huang ORCID iD
Author: Mariusz Andrzejczuk
Author: Małgorzata Lewandowska

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