title: Synthesis and characterization of Ti-Ta-Nb-Mn foams.
abstract: The unprecedented increase in human life expectancy have produced profound changes in the prevailing patterns of disease, like the observed increased in degenerative disc diseases, which cause degradation of the bones. Ti-Nb-Ta alloys are promising materials to replace the damaged bone due to their excellent mechanical and corrosion resistance properties. In general metallic foams are widely used for medical application due to their lower elastic moduli compare to bulk materials. In this work we studied the synthesis of 34Nb-29Ta-xMn (x: 2, 4 and 6 wt.% Mn) alloy foams (50% v/v) using ammonium hydrogen carbonate as a space holder. Alloys were produced through mechanical alloying in a planetary mill for 50h. Green compacts were obtained by applying 430 MPa pressure. To remove the space holder from the matrix the green compacts were heated to 180 °C for 1.5h and after sintered at 1300 °C for 3h. Foams were characterized by x-ray diffraction, scanning, transmission electron microscopy and optical microscopy. The elastic modulus of the foam was measured as ~30 GPa, and the values are almost equal to the values predicted using various theoretical models.
authors.affiliation: Departamento de Ingeniería Metalúrgica y Materiales, Universidad Técnica Federico Santa María, Av. España 1680, Valparaíso, Chile. Electronic address: claudio.aguilar@usm.cl.
authors.forename: C
authors.initials: C
authors.lastname: Aguilar
authors.affiliation: Departamento de Ingeniería Metalúrgica y Materiales, Universidad Técnica Federico Santa María, Av. España 1680, Valparaíso, Chile.
authors.forename: C
authors.initials: C
authors.lastname: Guerra
authors.affiliation: Departamento de Ingeniería Mecánica, Universidad Técnica Federico Santa María, Av. España 1680, Valparaíso, Chile.
authors.forename: S
authors.initials: S
authors.lastname: Lascano
authors.affiliation: Departamento de Metalurgia, Universidad de Atacama, Av. Copayapu 485, Copiapó, Chile.
authors.forename: D
authors.initials: D
authors.lastname: Guzman
authors.affiliation: Escuela de Ingeniería Mecánica, Facultad de Ingeniería, Pontificia Universidad Católica de Valparaíso, Av. Los Carrera, 01567 Quilpué, Chile.
authors.forename: P A
authors.initials: PA
authors.lastname: Rojas
authors.affiliation: Departamento de Ingeniería Metalúrgica y Materiales, Universidad Técnica Federico Santa María, Av. España 1680, Valparaíso, Chile.
authors.forename: M
authors.initials: M
authors.lastname: Thirumurugan
authors.affiliation: Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Morelia, Michoacán, Mexico.
authors.forename: L
authors.initials: L
authors.lastname: Bejar
authors.affiliation: Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Morelia, Michoacán, Mexico.
authors.forename: A
authors.initials: A
authors.lastname: Medina
mesh_terms: D000497:Alloys / Q000138:chemical synthesis* / Q000737:chemistry*; D019245:Compressive Strength; D004602:Elements; D008345:Manganese / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009556:Niobium / Q000737:chemistry*; D061848:Optical Imaging; D010316:Particle Size; D016062:Porosity; D011208:Powders; D013052:Spectrometry, X-Ray Emission; D013635:Tantalum / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D004602:Elements; D011208:Powders; D009556:Niobium; D008345:Manganese; D013635:Tantalum; D014025:Titanium
keywords: Metallic foams; Powder metallurgy; Ti–Nb–Ta–Mn alloys; Transmission electron microscopy