Effect of cooling and annealing conditions on the microstructure, mechanical and superelastic behavior of a rotary forged Ti–18Zr–15Nb (at. %) bar stock for spinal implants

Lukashevich, Konstantin, Sheremetyev, Vadim, Komissarov, Alexander, Cheverikin, Vladimir, Andreev, Vladimir, Prokoshkin, Sergey et Brailovski, Vladimir. 2022. « Effect of cooling and annealing conditions on the microstructure, mechanical and superelastic behavior of a rotary forged Ti–18Zr–15Nb (at. %) bar stock for spinal implants ». Journal of Functional Biomaterials, vol. 13, nº 4.
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Résumé

In this work, the microstructure, phase state, texture, superelastic and mechanical properties of a Ti–18Zr–15Nb (at. %) shape memory alloy subjected to a combined thermomechanical treatment, including hot rotary forging with either air cooling or water quenching and post-deformation annealing are studied. It was revealed that the main structural component of the deformed and annealed alloy is BCC β-phase. With an increase in the forging temperature from 600 to 700 °C, the average grain size increases from 5.4 to 17.8 µm for the air-cooled specimens and from 3.4 to 14.7 µm for the water-quenched specimens. Annealing at 525 °C after forging at 700 °C with water quenching leads to the formation of a mixed statically and dynamically polygonized substructure of β-phase. In this state, the alloy demonstrates the best combination of functional properties in this study: a Young’s modulus of ~33 GPa, an ultimate tensile strength of ~600 MPa and a superelastic recovery strain of ~3.4%.

Type de document:	Article publié dans une revue, révisé par les pairs
Professeur:	Professeur Brailovski, Vladimir
Affiliation:	Génie mécanique
Date de dépôt:	26 janv. 2023 23:48
Dernière modification:	03 févr. 2023 15:30
URI:	https://espace2.etsmtl.ca/id/eprint/26140

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