An assessment of microstructure and properties of laser clad coatings of ultrafine eutectic beta Ti-Fe-Nb-Sn composite for implants

Autor(es)

Afonso, C. R. M. ^[1] ; Vidilli, A. L. ^[1] ; Spinelli, J. E. ^[1] ; Riva, R. ^[2] ; Amigo, V. ^[3] ; Kiminami, C. S. ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ Sao Carlos UFSCar, Dept Mat Engn DEMa, BR-13565905 Sao Carlos, SP - Brazil

^[2] Inst Adv Studies IEAv, Dept Aerosp Sci & Technol DCTA, POB 6044, BR-12228970 Sao Jose Dos Campos, SP - Brazil

^[3] Univ Politecn Valencia, Inst Mat Technol ITM, POB 22012, E-46071 Valencia - Spain

• Tipo de documento: Artigo Científico
• Fonte: SURFACE & COATINGS TECHNOLOGY; v. 328, p. 161-171, NOV 15 2017.
• Citações Web of Science: 2

Resumo

High mechanical strength (1800-2500 MPa), elastic modulus (50-110 GPa) close to that of human bone and good corrosion resistance are some characteristics of ultrafine eutectic Ti-based nanocomposite alloys. This is explained due to a combination of soft beta-Ti (bcc) matrix and hard/refined TiFe and/or Ti3Sn intermetallic particles. The present study focuses on the production and characterization of Ti-Fe-Nb-Sn eutectic alloys using biocompatible beta-stabilizer elements, such as Nb, Fe and Sn. Different fabrication techniques based on rapid solidification may be highlighted considering the application of these alloys as implant materials. In the present investigation, the processing routes comprise single tracks and coatings (overlapped tracks) by laser melting of pre-alloyed powders of the Ti66Fe20Nb8Sn6 alloy deposited into a Ti substrate. To select this composition (i.e., the Ti66Fe20Nb8Sn6 alloy), three Ti-Fe-Nb based chemistries (Ti63Fe23Nb8Sn6, Ti60Fe23Nb8Sn9 and Ti66Fe20Nb8Sn6) were originally generated under bulk conditions by using a suction casting apparatus. These alloys were further evaluated. All samples were analyzed by metallography, X-ray diffraction (XRD), scanning electron microscopy (SEM-EBSD and SEM-EDS), microhardness, nanohardness and elastic modulus. The results showed that the proportions of the formed TiFe and Ti3Sn intermetallic particles dispersed within the soft beta-Ti matrix play a fundamental role on the final properties. Lower elastic modulus (E-72 GPa) is associated with the Ti66Fe20Nb8Sn6 bulk alloy. The laser clad coatings showed a broad range of nanohardness (4.8-8.0 GPa) and elastic modulus (98150 GPa) depending on the related laser power and scanning speeds. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/17090-8 - Laser cladding de pós obtidos por moagem de alta energia de ligas nanocristalinas Ti-(Nb,Mo)-Fe-Sn
• Beneficiário: André Luiz Vidilli
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Iniciação Científica
• Processo FAPESP: 15/19978-6 - Caracterização avançada através de TEM de amostras preparadas por FIB de recobrimentos de ligas nanocristalinas produzidos por aspersão térmica e laser cladding
• Beneficiário: Conrado Ramos Moreira Afonso
• Modalidade de apoio: Bolsas no Exterior - Pesquisa