4.7 Article

Evolution of elastic constants of the NiTi shape memory alloy during a stress-induced martensitic transformation

Journal

ACTA MATERIALIA
Volume 208, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.116718

Keywords

NiTi; Shape memory alloy (SMA); In situ tension test; Ultrasonic characterization; Anisotropic elasticity

Funding

  1. Czech Science Foundation [20-12624S]
  2. OP RDE-MEYS-Czechia ESS-Scandinavia-CZ-OP [CZ.02.1.01/0.0/0.0/16_013/0001794]
  3. Czech Technical University in Prague [SGS19/190/OHK4/3T/14]
  4. ERDF of the project 'Centre of Advanced Applied Sciences' [CZ.02.1.01/0.0/0.0/16_019/0000778]

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An in situ ultrasonic characterization was carried out on a NiTi shape memory alloy polycrystal under pseudoplastic straining, revealing a strong anisotropy during the transformation process, possibly related to twin boundaries.
We carried out an in situ ultrasonic characterization of a NiTi shape memory alloy polycrystal subjected to pseudoplastic straining. The measurement leads to a full elastic tensor of the transversely isotropic polycrystal during the stress-induced austenite -> R-phase -> B19' martensite transformation. The results reveal a strong anisotropy of the R-phase already in the low-strain state, which is then retained in character throughout the R-phase -> martensite transition and even in the stress-free oriented martensite after the unloading. By using a micromechanical model based on homogenization approaches, we show that this strong anisotropy is probably related to twin boundaries both in the R-phase and in martensite rather than to the anisotropy of the unit cell and the crystallographic texture. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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