Abstracts Book - IMRC 2018

• SB6-P064
SYNTHESIS OF Ti-Ta BASED ALLOYS FOAMS WITH HIGH YIELD
STRENGTH AND LOW ELASTIC MODULUS
Claudio Aguilar 1 , Carolina Gonzalez 1 , Mamie Sancy 2 , Luis Bejar 3 , Ariosto Medina 4
1 Universidad Técnica Federico Santa María, Departamento de Ingeniería Metalúrgica y
Materiales, Chile. 2 Pontificia Universidad Catolica de Chile, Escuela de Construcción Civil, Chile.
3 Universidad Michoacana de San Nicolás de Hidalgo, Facultad de Ingenieria Mecánica, Mexico.
4
Universidad Michoacana de San Nicolás de Hidalgo, Instituto de Investigaciones Metalurgica y
Materiales, Mexico.
The life expectative people is rapidly growing therefore the demanding replacing
failed orthopedic implant (such as hip joint) or dental implants is constantly
increasing in people over 40 year old. Artificial biomaterials are one of the
proposed solution for these problems as they expected to serve as implants or
to replace bones. Nowadays, Ti-based alloys are widely used as bio-implant
materials because their excellent properties but exhibit high elastic modulus.
Porous Ti-based alloys are currently considered for application in biomedical
implants owing to similarity of their mechanical properties with those of human
bone, potentially eliminating the risk of so-called stress shielding. . One of most
important Ti-based alloy is the Ti-6Al-4V, which was the first alloy with a+b
microstructure and today is widely used as biomaterial [1]. However, some
studies have been shown that V and Al ions could be released to human body
increasing the likelihood of diseases [2]. When V ions are release to human
tissues would alter the kinetics of enzyme activity associated with inflammatory
response cells [3,4] and the Al ions increases the probability to develop
Alzheimer [5,6]. In this sense, material scientists are investigating alloying
elements non-toxic to producing new Ti-based alloys which meet properties
required for biomaterials. Conventional sintering process was used to
consolidate the green samples using argon gas as protective atmosphere at
1300ºC for 5 h. Further, the foams were characterized by mechanical tests,
optical microscopy, scanning electron microscopy and X-ray diffraction. This
work reports the synthesis of Ti-13Nb-xSn foams using ((NH4)HCO3) as space
holder (0, 30, 40 and 50 v/v% added) with and without bimodal microstructure.
Samples with bimodal microstructure was obtained mixing milled and un-milled
powders in a proportion of 1:1. Samples without bimodal microstructure was
synthetized using only un-milled powders. The Young’s modulus values were
measured between 12 and 56 GPa by ultra sound method. The yield strength
values were estimated between 55 to 153 MPa by compressive test.