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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.)

Effect of Cobalt Doping and Milling Time on Microstructure and Vickers Microhardness of the Spark Plasma Sintered (67-x)Ti-xCo-22Si-11B (x=2 and 6 at-%) Alloys

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Author(s):
Ferreira, Nelson Damasio [1] ; Leal Neto, Ricardo Mendes [2] ; Filgueira, Marcello [3] ; Rodrigues Pais Alves, Manuel Fellipe [4] ; dos Santos, Claudinei [5] ; Ramos, Alfeu Saraiva [1]
Total Authors: 6
Affiliation:
[1] Univ Fed Alfenas, Inst Ciencia & Tecnol, Rodovia Jose Aurelio Vilela 11999, BR-37715400 Pocos De Caldas, MG - Brazil
[2] Inst Pesquisas Energet & Nucl, Av Prof Lineu Prestes, 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
[3] Univ Estadual Norte Fluminense, Ave Alberto Lamengo 200, Parque California, BR-28013602 Campos Dos Goytacazes, RJ - Brazil
[4] Univ Sao Paulo, Escola Engn Lorena, Gleba AI-6, BR-12602810 Lorena, SP - Brazil
[5] Univ Estado Rio de Janeiro, Fac Tecnol Resende, Rodovia Presidente Dutra Km 298, BR-27537000 Resende, RJ - Brazil
Total Affiliations: 5
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 23, n. 6 2020.
Web of Science Citations: 0
Abstract

Ti-6Al-4V and TiAl-based alloys are widely used for fabricating the implantable orthopedic devices and automotive components, respectively. Ti6Si2B-based alloys are attractive for use in orthopedic components because their higher hardness, superior biocompatibility and corrosion resistance in simulated body fluid than Ti and Ti-6Al-4V alloy. Limited information on Ti6Si2B stability in Co-dopped 67Ti-22Si-11B alloys are available in literature. This work presents the effect of cobalt doping and milling time on microstructure and Vickers microhardness of 65Ti-2Co-22Si-11B and 61Ti-6Co-22Si-11B (at-%) alloys produced by spark plasma sintering at 1100 degrees C for 12min using 20MPa. Samples were characterized by X ray diffraction, scanning electron microscopy, energy dispersive spectrometry, laser particle size analysis, and Vickers microhardness. Sintered alloys with 2 and 6at-%Co indicated the major presence of Ti6Si2B and Ti5Si3 dissolving up to 2.7 and 4.2 at-%Co, respectively, besides the minor precipitates of CoTi2 (4.4-16.7at-%Si) and CoTi (4.6-4.7at-%Si). Vickers microhardness of the sintered 65Ti-2Co-22Si-11B and 61Ti-6Co-22Si-11B alloys were in the range of 950-1050 and 1050-1150HV, respectively. Although the increase from 2 to 6at-%Co has reduced the Ti6Si2B stability, the Co-rich phases increased their hardness values up to 1150HV (11.3GPa), which are superior than those of commercial Ti alloys used for joint orthopedic components and automotive rotating parts. (AU)