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Laser Surface Remelting of Beta Ti alloys produced by Powder Metallurgy for applications as Biomaterial for Implants.


The synthesis of new Ti-based nanocrystalline and metastable alloys has been carried out because of their good engineering properties. These alloys are industrially important as structural and functional materials. Ti-based BMG alloys exhibit high strength (1800-2500 MPa), low elastic modulus (90-110 GPa) and, as expected, good corrosion resistance in various solutions. The increasing of life expectance turns necessary the scientific and technologic development of biomaterials, mainly those with orthopedic application. This research aims the production, processing and optimization of properties in ² Ti-Nb-Fe-Sn and Ti-Mo-Zr-Fe alloys for fabrication of lower cost prosthesis for total hip replacement. The metallic alloys applied nowadays in Brazil have much higher elastic modulus (E) than the one of human bone (E = 10 to 30 GPa): Stainless Steel (200 GPa), Co-Cr Alloys (220 GPa), Ti-6Al-4V (110 GPa) and the search for alloys with enhanced mechanical and chemical biocompatibility is necessary.The Beta-Ti alloys Ti-Mo-Zr-Fe (TMZF), modified Ti-Mo-Nb-Fe (TMNF) and Ti-Nb-(Fe)-Sn (wt%) are proposed in the present project, in order to compare alloys with different levels of Beta-stabilizing elements, and possibly forming different combinations of phases and microstructures. It is expected that different alloys (compositions) and processing routes: (100% dense casting), PM sintering (~ 5% porosity) and laser surface remelted RSL (porous inside and dense on a surface layer), will give a more favorable combination of microstructure and properties, aiming at the lowest possible elastic modulus E (GPa).The objective of this work is to evaluate and compare, through experimental results, the potential of laser surface remelting (LSR) of porous ²-Ti alloys obtained by powder metallurgy (PM) in the modification of microstructure and properties, such as elastic modulus, E (GPa), in comparison to dense cast alloys. The effects of structural changes proposed for biomedical implants on the properties and stiffness of the part with the inherent porosity of PM sample will be compared with those of a dense (cast) part. (AU)

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(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SANTOS, R. F. M.; RICCI, V. P.; AFONSO, C. R. M.. Influence of Swaging on Microstructure, Elastic Modulus and Vickers Microhardness of beta Ti-40Nb Alloy for Implants. Journal of Materials Engineering and Performance, v. 30, n. 5, SI, . (17/20287-3)
RICCI, VIRGILIO P.; DOS SANTOS, RAFAEL F. M.; ASATO, GABRIEL H.; ROCHE, VIRGINIE; JORGE JUNIOR, ALBERTO M.; AFONSO, CONRADO R. M.. Assessment of anodization conditions and annealing temperature on the microstructure, elastic modulus, and wettability of beta-Ti40Nb alloy. Thin Solid Films, v. 737, . (17/20287-3)

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