Publication: Effect of iron ternary alloying element on the microstructure and properties of metal injection moulding ti-mo alloy
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Date
2024-08-01
Authors
Nurul Najah Azizi
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Abstract
Ti based alloys have been widely used as biocompatible materials. Current research is
focused on developing β-type titanium alloys to replace the unfavourable Ti-6Al-4V
alloy, since the Ti-6Al-4V alloy has a higher elastic modulus (110 GPa) than the
human bone (10-30 GPa). Furthermore, the release of vanadium and aluminum from
the alloy can lead to chronic illnesses such as Alzheimer’s and neuropathy. To address
this issue, two β-Ti alloys with non-toxic elements (Ti-15Mo and Ti-13Mo-2Fe) have
been developed and fabricated by metal injection moulding. The objective of this
project is to investigate the effect of Fe content on β-Ti phase stability, microstructure,
and mechanical properties as well as to produce low-cost Ti alloy with high amount of
β-Ti. The alloys undergoes metal injection moulding and the green parts were sintered
under 1100˚C for 2 hours. Ti-15Mo and Ti-13Mo-2Fe compared to pure titanium
phases, density, hardness, compression behaviour and degradation in simulated body
fluid. Adding Fe to Ti-15Mo alloy, further increases the β-Ti phase in the Ti-13Mo-
2Fe alloy as confirmed by X-ray diffraction, optical microscope and scanning electron
from 52.3% to 64.7%. Thus, Ti-13Mo-2Fe exhibits the highest hardness value (647.36
Hv), compressive strength (858.4MPa) and the lowest Young’s Modulus (59.7GPa)
since the β-Ti phase give elasticity. Besides, Ti-13Mo-2Fe exhibits the least
dissolution elements in simulated body fluid based on inductively couple plasma (ICP)
analysis (6.65074 ppm). These properties closely match to those of human bone,
demonstrate their potential as ideal biomedical implants.