EFFECT OF SOLUTION HEAT TREATMENT AND TWO-STEP AGING ON MICROSTRUCTURE, MECHANICAL PROPERTIES AND CORROSION RESISTANCE OF TITANIUM COPPER ALLOYS SYNTHESIZED BY SPARK PLASMA SINTERING
Titanium alloy is one of the most commonly used alloys in the biomedical field as orthopedic implants. This because titanium alloys have a superior combination of properties such as strength, corrosion resistance, osseointegration ability and biocompatibility. One of the alloys that is being dev...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/81384 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Titanium alloy is one of the most commonly used alloys in the biomedical field
as orthopedic implants. This because titanium alloys have a superior
combination of properties such as strength, corrosion resistance,
osseointegration ability and biocompatibility. One of the alloys that is being
developed and researched further, especially for this research, is the Ti-Cu
alloy. The presence of copper alloying elements can enhance antibacterial
properties to the alloy. The spark plasma sintering (SPS) method is powder
metallurgy technology chosen to prepare Ti-Cu alloy with low porosity and
high density from its constituent powders. Heat treatment was given to the Ti-
1Cu, Ti-3Cu and Ti-5Cu alloys to study their effect on the microstructure,
mechanical properties and corrosion resistance of each composition.
Heat treatment begins with solution treatment carried out at 900? which is
held for 2 hours, then continued with water quenching. Next, heat aging
treatment is carried out which is divided into 2, namely one-step aging at a
temperature of 400? with a holding time of 24 hours and two-step aging at a
temperature of 475? with a holding time of 8 hours. The results of each
experiment were analyzed for microstructure using an optical microscope
(OM) and scanning electron microscope – energy dispersive x-ray
spectroscopy (SEM-EDS). The mechanical property analyzed is the hardness
of the alloy by carrying out a hardness test using the Vickers hardness test.
Corrosion resistance was analyzed using a electrochemical test by open circuit
potential and potentiodynamic polarization procedure to obtain corrosion rate
values for each alloy composition
The research results show that only solution treatment still leaves precipitates
in the as-sintered condition because the ST holding time is relatively short so
that the dissolution of copper atoms is not optimal into the ?-Ti matrix.
Solution treatment followed by two-step aging makes the nucleation process
more thorough and the precipitates begin to grow again. The hardness of the
Ti-1Cu, Ti-3Cu and Ti-5Cu alloys after the sequential heat treatment process is
591.8 HV., 555.4 HV, 572.4 HV. The best corrosion resistance of the alloys
after solution heat treatment and two-step aging in ringer lactate solution based
on the corrosion rate values in descending sequence is the Ti-1Cu, Ti-3Cu and
Ti-5Cu alloys with respective values of 5.42x10-4 mm/year; 2.04x10-3 mm/year
and 2.69x10-3 mm/year |
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