Öz
Structural and mechanical properties of Al-Si-Mg
cast alloys depend on Į-Al phase, eutectic-Si
particles, iron-rich intermetallics and especially
Mg2Si phase. These can be changed with various
ways such as chemical modification, Mg addition. In
this study, commercial A360 hypoeutectic Al-Si-Mg
alloy with addition of 0.2% - 0.8% Mg, affecting of
alteration in microstructure and hardness, was
investigated. The alloys in different compositions
were produced by gravity casting method. And the
casting temperature was set at 650°C.
Microstructures were examined and intermetallic
compounds were shown in detail. The observations
were carried out in MEIJI ML 7100 optical
microscopy. According to microstructural results;
Mg2Si phase, AlFeMnSi phase and eutectic phase
occurred in the structure. In addition, the effect of
Mg supplementation in rates of 0% - 0.2% - 0.4% -
0.8% have also examined. The hardness was
measured in Brinell macro hardness tester. The
results showed that the Mg addition increased the
hardness. Micro hardness of intermetallic phases
was measured. Thus, the effect of hardness of the
phases may be identified. Micro hardness
measurements were carried out under load 10 gf in
Vickers micro hardness tester. As a result of this
work, it was found that Mg2Si phase increased the
hardness values. According to the specific hardness
values, the hard phase was Mg2Si intermetallic
phase which consist of Mg addition. Intermetallics
and eutectic Si phase fined with increasing Mg
addition. The addition of Mg increased the hardness
of the material overall.
Anahtar Kelimeler
Ayrıntılar
| Diğer ID | JA34BN96PE |
|---|---|
| Bölüm | Makaleler |
| Yazarlar | |
| Yayımlanma Tarihi | 1 Aralık 2011 |
| Gönderilme Tarihi | 1 Aralık 2011 |
| Yayımlandığı Sayı | Yıl 2011 Cilt: 2 Sayı: 2 |