Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Si alloys

Effect of Zinc Addition on the Density and Wear Rate of Al-12Si Compacts

Mahde Mter Hanoon

Engineering and Technology Journal, 2012, Volume 30, Issue 18, Pages 382-391

This research aimed to prepareAl-12Si alloys by powder metallurgy method because of its
commercial and technological importance. Aluminum and Silicon powders were used, then
mixed and blended together and classified into four parts, carbon powder was added to the
three parts (5,10 and 15% wt) and the last remain as it is. These powders were mixed to
ensure a good distribution of Zinc powder, and then they compacted in is ostatic cold pressure
at 10 ton, the compact samples were sintered in furnace under argon gas at 530°C for one
hour, These samples were then prepared (grinded, polished and etched) for them icrostructure
examination, density, porosity, microhardness, X-ray diffraction and wear resistance. The
results showed anincrease in the density and the hardness with addition ratio.

Effect of Sodium Modifier on the Microstructure and Wear Rate of Al-14 Wt%Si Alloy

Haitham Rzouqi Saleh; Mahdi Muter Hanoon; Adnan Ibrahim Mohammed

Engineering and Technology Journal, 2010, Volume 28, Issue 22, Pages 6615-6622

In this study, a demonstration of the effect of Na addition to the
microstructure and wear rate of hypereutectic Al-14 wt% Si alloy was carried out. It is
found that the addition of Na has an important effect on shifting the eutectic
composition of Al-Si alloys from approximately 12 wt% to 14 wt% Si; shifting the
unmodified alloy from hypereutectic to eutectic alloys for the modified alloys. The
modified alloys have a eutectic composition with fine needle at lower Na content
(0.05 wt%). Increasing the percentage of Na to 0.12 wt% resulted in producing a
lamellar Si structure compared with acicular structure for unmodified alloy. The wear
rate of modified alloys is lower than the hypereutectic alloy. Wear rates observed
were in the range of 10-9 to 10-11 which is fully identified in the mild wear rate regime.