EFFECT OF CASTING TECHNIQUES AND SiC PARTICLE SIZE ON THE MECHANICAL PROPERTIES OF METAL-MATRIX A356 COMPOSITES

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

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