Authors :
Saroj Kumar Sahu; Adiraj Behera; Rahul Kumar Patra; Jamuna Sethi
Volume/Issue :
Volume 9 - 2024, Issue 2 - February
Google Scholar :
http://tinyurl.com/bdfxsv8f
Scribd :
http://tinyurl.com/5h4bn47k
DOI :
https://doi.org/10.5281/zenodo.10693156
Abstract :
Aluminium-silicon (Al-Si) alloys have become
the preferred choice for modern automobile engines,
replacing conventional cast iron materials. This transition
has resulted in significant improvements in both fuel
efficiency and reduced vehicle emissions. The superior
performance of Al-Si alloys can be attributed to their
unique microstructure, characterized by primary silicon
crystals with diverse shapes such as polygons, plates, and
feathery structures, along with the presence of an eutectic
phase (α -Al + eutectic silicon). The distribution of these
microstructures can vary depending on factors like
pouring temperature and the addition of other
compounds like alumina, which further enhance the
mechanical and tribological properties. For instance,
alloys with 16% silicon and 4% alumina (Al-16Si- 4%
Al2O3) exhibit improved hardness and wear resistance
compared to their conventional counterparts. X-ray
diffraction (XRD) analysis has revealed the presence of
SiO2, Al2O3, and Al-rich intermetallic compounds while
scanning electron microscopy (SEM) images demonstrate
the modification of primary silicon structures (feathery,
star, and plate-like shapes) and eutectic silicon structures
(coarse acicular and flake-like shapes) due to the addition
of alumina content. Notably, the brittle phase formation
Al2O3, SiO2, , and Al-rich intermetallic compounds
contribute to enhanced mechanical and tribological
properties. Experimental studies conducted in this field
have demonstrated that increasing the alumina content
leads to higher hardness values, and wear tests conducted
under varying loads and speeds have shown improved
wear resistance with increasing alumina content.
Keywords :
Al-Rich Intermetallic Compound; Tribological Properties Al-Si- Al2O3 alloy Al-16Si- 4%Al2O3.
Aluminium-silicon (Al-Si) alloys have become
the preferred choice for modern automobile engines,
replacing conventional cast iron materials. This transition
has resulted in significant improvements in both fuel
efficiency and reduced vehicle emissions. The superior
performance of Al-Si alloys can be attributed to their
unique microstructure, characterized by primary silicon
crystals with diverse shapes such as polygons, plates, and
feathery structures, along with the presence of an eutectic
phase (α -Al + eutectic silicon). The distribution of these
microstructures can vary depending on factors like
pouring temperature and the addition of other
compounds like alumina, which further enhance the
mechanical and tribological properties. For instance,
alloys with 16% silicon and 4% alumina (Al-16Si- 4%
Al2O3) exhibit improved hardness and wear resistance
compared to their conventional counterparts. X-ray
diffraction (XRD) analysis has revealed the presence of
SiO2, Al2O3, and Al-rich intermetallic compounds while
scanning electron microscopy (SEM) images demonstrate
the modification of primary silicon structures (feathery,
star, and plate-like shapes) and eutectic silicon structures
(coarse acicular and flake-like shapes) due to the addition
of alumina content. Notably, the brittle phase formation
Al2O3, SiO2, , and Al-rich intermetallic compounds
contribute to enhanced mechanical and tribological
properties. Experimental studies conducted in this field
have demonstrated that increasing the alumina content
leads to higher hardness values, and wear tests conducted
under varying loads and speeds have shown improved
wear resistance with increasing alumina content.
Keywords :
Al-Rich Intermetallic Compound; Tribological Properties Al-Si- Al2O3 alloy Al-16Si- 4%Al2O3.
