Abstracts Book - IMRC 2018

• SB6-P074
BIOMEDICAL Ti-25Ta ALLOY PRODUCED BY MECHANICAL
ALLOYING AND SINTERING
Karla Nayeli Arreola García 1 , Alecia Torres García 1 , Claudia Alejandra Rodríguez González 2 , Jose
Alberto Duarte Moller 3 , Cynthia Deisy Gomez Esparza 3
1 Universidad Tecnologica de Ciudad Juárez, Ingeniería en Nanotecnología, Mexico. 2 Centro de
Investigación en Materiales Avanzados, S.C., Instituto de Ingeniería y Tecnología, Mexico.
3
Centro de Investigación en Materiales Avanzados, S.C., Física de Materiales, Mexico.
Ti base alloys have unique combinations of mechanical and biological properties
such as high biocompatibility and in vivo osseointegration. Through the
technique of powder metallurgy, these materials are processed to obtain
porous specimens for biomedical applications. The advantage of the use of
porous materials is due to the rigidity they possess. Metal implants have a great
difference in stiffness compared to human bone, which causes an
inhomogeneous distribution of stresses and sometimes leads to bone wear, and
even fractures. Porous implants have the advantage of having a lower stiffness.
The alloy Ti-6Al-4V is the most used for implants, however, it has been
determined that it has a lower wear resistance and a modulus of elasticity
greater than that of human bones, in addition to inducing toxic effects through
the release of Al and V ions. For this reason, recent research has focused on
other Ti base alloy systems, such as the Ti-Ta system, which has attractive
biocompatibility properties, less risk of radiation toxicity, mechanical properties
closer to those of bones, and excellent anticorrosive and oxidation performance
due to the formation of a protective layer of tantalum oxide. However, TiTa
alloys are not yet widely adopted due to the difficulty of being processed by a
liquid route, since these two elements have a large difference in melting point
and density. Therefore, the aim of this study is to process a Ti alloy with 25 wt.%
of Ta by mechanically alloying and conventional sintering. Milling time and
sintering temperature were used as the principal process variations. Through X-
ray diffraction analysis it was determined that the mechanical alloying process
favors the formation of solid solutions with nanometric crystal size since 5 h of
milling. The cold-compaction and conventional sintering promoted the
formation of porous materials without the need to use salt particles as a space
holder. After sintering, it was observed that hardness samples gradual increases
with milling time. Deeper tests of mechanical properties are being carried out to
determine the modulus of this material.