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Specific forward/reverse latent heat and martensite fraction measurement during superelastic deformation of nanostructured NiTi wires

Henrique Ramos de Oliveira 1 Hervé Louche 2 Estephanie Nobre Dantas Grassi 1 Denis Favier 1
1 TIMC-BioMMat - Ingénierie Biomédicale et Mécanique des Matériaux
TIMC - Techniques de l'Ingénierie Médicale et de la Complexité - Informatique, Mathématiques et Applications, Grenoble - UMR 5525
2 ThM2 - ThermoMécanique des Matériaux
LMGC - Laboratoire de Mécanique et Génie Civil
Abstract : This study analyses the thermomechanical tensile behaviour of a cold drawn Ti-50.9at.%Ni wire submitted to heat treatment at 598 K for 30 min, which is below the recrystallization temperature (623 K). Such low temperature heat treatment induces a superelastic loop without a stress "plateau". However, the absence or weakness of peaks on its differential scanning calorimetry prevents the determination of specific latent heat. This is a common effect of nanostructured materials such as superelastic wires. A method using strain and temperature field measurements was developed and used to determine thermal power and thermal energy during superelastic tensile tests through a heat balance. From these results and using a thermodynamic approach, forward and reverse specific latent heat and the martensite fraction are estimated as a function of strain and stress.
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Henrique Ramos de Oliveira, Hervé Louche, Estephanie Nobre Dantas Grassi, Denis Favier. Specific forward/reverse latent heat and martensite fraction measurement during superelastic deformation of nanostructured NiTi wires. Materials Science and Engineering: A, Elsevier, 2020, 774, pp.138928. ⟨10.1016/j.msea.2020.138928⟩. ⟨hal-02470296⟩

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