شبكة التخطيط العمراني بسم الله الرحمن الرحيم
للكاتبين :
AMIR A.MAHDY1, M.SHERIF EL-ESKANDARANY1, A.KANDIL1,
S. ABD EL ALL 2, S.F.MOUSTAFA3, A.H.AMER1
1 Mining, Metallurgy and Petroleum Eng. Department, Al Azhar University, Nasr City 11371, Cairo,
Egypt.
2 Radiation Physics Dept., National Center for Radiation Research and technology, Nasr City, Cairo,
Egypt.
3 Central Metallurgical Research and Development Institute, Helwan
ABSTRACT
stir and compocasting techniques were used to produce Al/SiC composite materials.
Aluminium alloy (A356) was used as a matrix for producing such composites with different
volume fractions of particulate SiC. The microstructural characterization studies conducted on
the composites produced by compocasting technique revealed a more uniform distribution of
SiC particulates and less porosity content when, compared to the composites prepared by stir
casting technique. X-ray diffraction technique was used to check the structure of the obtained
composites. The density measurements show that the obtained composites contained little
porosity of less than 2%. Moreover, the amount of porosity in the composites increased with
increasing the volume fraction and decreasing size of reinforcement particles. Some
mechanical properties such as hardness, wear resistance and tensile strength were measured as
a function of SiC content. The hardness values for cast composites using 50 μm SiC with
different SiC volume fraction prepared by stir and compocasting techniques were measured in
the range of 95-180 and 101-191 BHN, respectively. Also, the tensile strength increases with
increasing the volume fraction of particulate SiC. Moreover, wear resistance behavior for
composites prepared by compocasting technique were improved with increasing SiC content
and SiC particle size. Whereas, wear resistance behavior for composites prepared by stir
casting technique were improved with increasing SiC content and decreasing in SiC particle
size