Sheremetyev, V., Lezin, V., Lukashevich, K., Chernyshikhin, S., Cheverikin, V., Tvorogov, A., Derkach, M., Prokoshkin, S. et Brailovski, V..
2026.
« LPBF-fabricated superelastic Ti-Zr-Nb open cell lattice structures for orthopedic implants: Process optimization, geometric conformity, microstructure, static and fatigue mechanical behavior ».
Journal of Materials Research and Technology, vol. 43.
4014–4032.
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Résumé
Additively manufactured orthopedic implants are required to simultaneously offer a high geometric accuracy, a low elastic modulus, and an excellent fatigue resistance. In this study, we optimized laser powder bed fusion (LPBF) process parameters to fabricate three open cell lattice structures from a superelastic Ti–Zr–Nb alloy: a rhombic dodecahedron, a sheet gyroid, and a Voronoi polyhedral. In these structures, the strut thickness ranged between 200 and 400 μm and the functional porosity, between 65 and 80%. Geometric conformity and defect porosity were quantified using microcomputed tomography, revealing that the optimized processing limited the maximum deviations in functional porosity to 9%, with the gyroid architecture demonstrating the highest dimensional accuracy. At the same time, the defect porosity in all the structures did not exceed 0.2%. After the heat treatment, microstructural analysis and mechanical testing confirmed the presence in these structures of metastable β-phase. Under quasi-static compression, the lattice specimens manifested a yield plateau associated with stress-induced martensitic transformation. Fatigue testing of Ti–Zr–Nb structures demonstrated a stable cyclic performance and competitive fatigue resistance up to 5 × 106 cycles as compared to their benchmark Ti–6Al–4V counterparts. The results obtained highlight the potential of LPBF-fabricated superelastic Ti–Zr–Nb lattice specimens for load-bearing implant applications, owing to their reduced stiffness and enhanced long-term mechanical durability.
| Type de document: | Article publié dans une revue, révisé par les pairs |
|---|---|
| Chercheur(-euse): | Chercheur(-euse) Brailovski, Vladimir |
| Affiliation: | Génie mécanique |
| Date de dépôt: | 11 août 2026 20:16 |
| Dernière modification: | 26 sept. 2026 18:23 |
| URI: | https://espace2.etsmtl.ca/id/eprint/34198 |
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