Microstructure, mechanical and superelastic properties of Ti-Zr-Nb alloy for biomedical application subjected to equal channel angular pressing and annealing

Sheremetyev, Vadim, Derkach, Mikhail, Churakova, Anna, Komissarov, Aleksander, Gunderov, Dmitry, Raab, Georgy, Cheverikin, Vladimir, Prokoshkin, Sergey et Brailovski, Vladimir. 2022. « Microstructure, mechanical and superelastic properties of Ti-Zr-Nb alloy for biomedical application subjected to equal channel angular pressing and annealing ». Metals, vol. 12, nº 10.
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Résumé

Biomedical Ti-18Zr-15Nb (at.%) shape memory alloy was subjected to a low-temperature equal channel angular pressing (ECAP) at 200 ◦C for three passes and post-deformation annealing (PDA) in the 400–650 ◦C temperature range for 1 to 60 min. It was observed that ECAP led to the formation of an inhomogeneous highly dislocated substructure of β-phase with a large number of differently oriented deformation bands containing nanograined and nano-subgrained areas. In this state, the alloy strength increased significantly, as compared to the undeformed state, but its ductility and superelasticity deteriorated appreciably. As a result of a short-term (5 min) PDA at 550–600 ◦C, the processes of polygonization of an entire volume of the material and recrystallization inside the deformation bands were observed. After PDA at 600 ◦C for 5 min, the alloy manifested a relatively high strength (UTS = 650 MPa), a satisfactory ductility (δ = 15%) and a superior superelastic behavior with a maximum superelastic recovery strain of εrsemax = 3.4%

Type de document:	Article publié dans une revue, révisé par les pairs
Professeur:	Professeur Brailovski, Vladimir
Affiliation:	Génie mécanique
Date de dépôt:	11 nov. 2022 21:01
Dernière modification:	18 nov. 2022 15:50
URI:	https://espace2.etsmtl.ca/id/eprint/25770

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