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

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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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Abstract

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%

Item Type: Peer reviewed article published in a journal
Professor:
Professor
Brailovski, Vladimir
Affiliation: Génie mécanique
Date Deposited: 11 Nov 2022 21:01
Last Modified: 18 Nov 2022 15:50
URI: https://espace2.etsmtl.ca/id/eprint/25770

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