1 results listed
In the present study Al-12.6 wt.% Si-x wt.% NbB2 and Al-12.6 wt.% Si-x wt.% VB (x=1, 2 and 5 wt.%) powders were
synthesized by mechanical alloying (MA) from Al, Si, NbB2 and VB elemental powders. MA process was performed in
high energy ball milling atmosphere for 0, 2, 4 and 8 h using a 1200 rpm SpexTM 8000D Mixer/Mill. Detailed
characterizations of MA’d powders included X-ray diffractometer (XRD), differential scanning calorimetry (DSC) and
scanning electron microscopy/energy dispersive spectrometer (SEM/EDS). Powder characterizations revealed that
particle morphologies changed from flaky to equaxied shape after 4 h of MA. EDS mapping analyses showed
homogeneous Si distribution in Al matrix. Besides, increasing boride contents led XRD peaks to shift gradually towards
right, crystallite size s to decrease and lattice strains to increase. Furthermore, XRD studies demonstrated up to 2.05 wt.%
Si diffusion into the Al matrix. Endothermic peak temperature decreased to ~580 C from Al melting temperature of ~660
C after 4 h MA.
International Symposium on Light Alloys and Composite Materials
UHAKS
Emre Tekoğlu
Sıddıka Mertdinç
Duygu Ağaoğulları
M. Lütfi Öveçoğlu