Effect of Cu on Amorphization of a TiNi Alloy during HPT and Shape Memory Effect after Post‐Deformation Annealing

Hamed Shahmir , Mahmoud Nili Ahmadabadi , Mahdi Mohammadi , Yi Huang , Mariusz Andrzejczuk , Małgorzata Lewandowska , Terence G. Langdon

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%. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Author Hamed Shahmir - University of Sheffield
Hamed Shahmir,,
-
, Mahmoud Nili Ahmadabadi - University of Tehran
Mahmoud Nili Ahmadabadi,,
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, Mahdi Mohammadi - University of Tehran
Mahdi Mohammadi,,
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, Yi Huang - Bournemouth University, Poole
Yi Huang,,
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, Mariusz Andrzejczuk (FMSE / DMD)
Mariusz Andrzejczuk,,
- Division of Materials Design
, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
, Terence G. Langdon - University of Southampton
Terence G. Langdon,,
-
Journal seriesAdvanced Engineering Materials, ISSN 1438-1656, e-ISSN 1527-2648
Issue year2020
Vol22
No1
Pages1-8
Publication size in sheets0.5
Keywords in Englishamorphization; nanostructured materials; severe plastic deformation; shape memory effects; TiNiCu alloys
ASJC Classification2500 General Materials Science; 3104 Condensed Matter Physics
DOIDOI:10.1002/adem.201900387
URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070871881&doi=10.1002%2fadem.201900387&partnerID=40&md5=3faeda629cb9d43c11bed472c420085a
Languageen angielski
File
Shahmir_et_al-2019-Advanced_Engineering_Materials.pdf 2.13 MB
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 23-06-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.078; WoS Impact Factor: 2018 = 2.906 (2) - 2018=2.897 (5)
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