Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from SciELO 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

Full text
Author(s):
Nelson Damásio Ferreira [1] ; Ricardo Mendes Leal Neto [2] ; Marcello Filgueira [3] ; Manuel Fellipe Rodrigues Pais Alves [4] ; Claudinei dos Santos [5] ; Alfeu Saraiva Ramos [6]
Total Authors: 6
Affiliation:
[1] Instituto de Ciência e Tecnologia. Universidade Federal de Alfenas - Brasil
[2] Instituto de Pesquisas Energéticas e Nucleares - Brasil
[3] Universidade Estadual do Norte Fluminense Darcy Ribeiro - Brasil
[4] Universidade de São Paulo. Escola de Engenharia de Lorena - Brasil
[5] Faculdade de Tecnologia de Resende. Universidade do Estado do Rio de Janeiro - Brasil
[6] Instituto de Ciência e Tecnologia. Universidade Federal de Alfenas - Brasil
Total Affiliations: 6
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 23, n. 6 2020-12-14.
Abstract

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 oC 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)