中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 31 No. 1 January 2021 |
（1. División de Estudios de Posgrado e Investigación, Tecnológico Nacional de México/ITMorelia, Av. Tecnológico #1500, Colonia Lomas de Santiaguito, Morelia, C.P. 58120, México;
2. Universidad de Guadalajara, DIP, José Guadalupe Zuno #48, Los Belenes, Zapopan, C. P. 45100, México;
3. INICIT, Universidad Michoacana de San Nicolás de Hidalgo, Fco. J. Mujica S/N, Morelia, C. P. 58060, México;
4. Departamento de Ingeniería Mecánica Eléctrica, CUCEI, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1421, Olímpica, C. P. 44430 Guadalajara, Jalisco, México;
5. Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro 76230, México）
Abstract:The aim of this work was to develop a Ti6Al4V/20CoCrMo-highly porous Ti6Al4V bilayer for biomedical applications. Conventional powder metallurgy technique, with semi-solid state sintering as consolidation step, was employed to fabricate samples with a compact top layer and a porous bottom layer to better mimic natural bone. The densification behavior of the bilayer specimen was studied by dilatometry and the resulting microstructure was observed by scan electron microscopy (SEM) and computed microtomography (CMT), while the mechanical properties and corrosion resistance were evaluated by compression and potentiodynamic tests, respectively. The results indicate that bilayer samples without cracks were obtained at the interface which has no negative impact on the densification. Permeability values of the highly porous layer were in the lower range of those of human bones. The compression behavior is dictated by the highly porous Ti6Al4V layer. Additionally, the corrosion resistance of Ti6Al4V/20CoCrMo is better than that of Ti6Al4V, which improves the performance of the bilayer sample. This work provides an insight into the important aspects of a bilayer fabrication by powder metallurgy and properties of Ti6Al4V/20CoCrMo-highly porous Ti6Al4V structure, which can potentially benefit the production of customized implants with improved wear performance and increased in vivo lifetime.
Key words: bilayer structure; composites; porosity; sintering; permeability; compression behavior; corrosion
