| dc.description.abstract | Powder metallurgy is a manufacturing method that allows the production of
materials with superior mechanical properties and homogeneous microstructure
through the process of mixing, pressing, and sintering metal powders. This study
examines the effect of the addition of Aluminum (Al) and Carbon Nanotube (CNT)
elements on the mechanical properties and microstructure of Fe/Cu alloys. Al-CNT
addition variations used are 0.5 wt.%, 1 wt.%, and 1.5 wt.% with premilling process
using high energy ball mill, and 1.5 wt.% Al-CNT without premilling process. The
test results showed that the highest density was obtained in the alloy with 0.5 wt.%
Al-CNT composition at 6.06 g/cm³, while the lowest density was found in the 1.5
wt.% Al-CNT composition without premilling with a value of 5.61 g/cm³. The
highest Vickers hardness of 87.7 VHN was achieved in the 1.5 wt.% Al-CNT
composition with premilling, while the lowest hardness of 76.3 VHN was found in
the 0.5 wt.% Al-CNT composition. Compressive testing obtained the highest yield
stress value of 278.414 MPa in the 1.5 wt.% Al-CNT composition with premilling,
and the lowest value of 215.333 MPa in the 0.5 wt.% Al-CNT composition. The
highest wear rate was found at 0.5 wt.% Al-CNT composition of 4.98 × 10-⁷
mm³/Nmm, while the lowest wear rate of 2.59 × 10-⁷ mm³/Nmm was achieved at
1.5 wt.% Al-CNT composition with premilling. The addition of Al-CNT
consistently improved the alloy microstructure by reducing porosity from 2068
porosity at 0.5 wt.% to 1218 porosity at 1.5 wt.% Al-CNT with premilling. The
premilling process proved capable of further reducing porosity, where at 1.5 wt.%
composition without premilling, the number of porosities reached 1820. These
results indicate that the addition of Al-CNTs and the premilling process have a
significant effect on improving mechanical properties, reducing porosity, and
improving microstructure distribution in Fe/Cu alloys. | en_US |
