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Materials 2017, 10(10), 1174; https://doi.org/10.3390/ma10101174

On the Effect of Hydrogen on the Low-Temperature Elastic and Anelastic Properties of Ni-Ti-Based Alloys

1
Ioffe Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia
2
ITMO University, Kronverkskiy 49, 197101 St. Petersburg, Russia
3
Departament de Física, Universitat de les Illes Balears, Cra Valldemossa km 7.5, E 07122 Palma de Mallorca, Spain
4
Department MTM, Katholieke Universiteit Leuven, Kasteelpark Arenberg 44, B-3001 Leuven, Belgium
*
Author to whom correspondence should be addressed.
Received: 26 August 2017 / Revised: 3 October 2017 / Accepted: 10 October 2017 / Published: 13 October 2017
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Abstract

Linear and non-linear internal friction and the effective Young’s modulus of a Ni50.8Ti49.2 alloy have been studied after different heat treatments, affecting hydrogen content, over wide ranges of temperatures (13–300 K) and strain amplitudes (10−7–10−4) at frequencies near 90 kHz. It has been shown that the contamination of the alloy by hydrogen strongly affects the internal friction and Young’s modulus of the martensitic phase. Presence of hydrogen gives rise to a non-relaxation internal friction maximum due to a competition of two different temperature-dependent processes. The temperature position and height of the maximum depend strongly on the hydrogen content. We conclude that many of the internal friction peaks, reported earlier for differently treated Ni-Ti-based alloys, had the same origin as the present maximum. View Full-Text
Keywords: shape memory alloy; acoustic properties; internal friction; lattice defects; hydrogen shape memory alloy; acoustic properties; internal friction; lattice defects; hydrogen
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Sapozhnikov, K.; Torrens-Serra, J.; Cesari, E.; Van Humbeeck, J.; Kustov, S. On the Effect of Hydrogen on the Low-Temperature Elastic and Anelastic Properties of Ni-Ti-Based Alloys. Materials 2017, 10, 1174.

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