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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Afonso, C. R. M. [1] ; Vidilli, A. L. [1] ; Spinelli, J. E. [1] ; Riva, R. [2] ; Amigo, V. [3] ; Kiminami, C. S. [1]
Total Authors: 6
[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
Total Affiliations: 3
Document type: Journal article
Source: SURFACE & COATINGS TECHNOLOGY; v. 328, p. 161-171, NOV 15 2017.
Web of Science Citations: 2

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)

FAPESP's process: 15/17090-8 - Laser cladding of high energy ball milled powder of nanocrystalline Ti-(Nb,Mo)-Fe-Sn alloys
Grantee:André Luiz Vidilli
Support type: Scholarships abroad - Research Internship - Scientific Initiation
FAPESP's process: 15/19978-6 - Advanced characterization through TEM of FIB prepared samples of nanocrystalline alloy coatings produced by thermal spray and laser cladding
Grantee:Conrado Ramos Moreira Afonso
Support type: Scholarships abroad - Research
FAPESP's process: 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys
Grantee:Claudio Shyinti Kiminami
Support type: Research Projects - Thematic Grants