• Yutiman, Safwan
• Hehsan, H.
• Jamian, Saifulnizan

Abstract

The main purpose of this study was to investigate the silicon (Si) particles distribution of Al LM6 cylinderproduced by centrifugal casting method. Al LM6 cylinder fabrication started by melting Al LM6 ingots. The melt is thenpoured into a rotating mould with constant speed of 1700 rpm (100 times of gravity value, 100G) at room temperature.After five hours left to freeze, LM6 Al cylinder is removed from the mold. The result is an Al LM6 hollow cylinder withthe outer and inner diameter of 60 and 20 mm, respectively and the thickness of 35 mm. The temperatures of the molteningot used in this study were 690, 710 and 725°C. The microstructure differences due to different melting temperaturesobserved using an optical microscope (OM). Microstructural observations show that the Si particles content are almost thesame on the inside, center and outside the specimen. However, the sizes of Si particles in these three parts are different.The particle size of the specimens has a size larger than in the middle and the outside. The difference in size is due to thelow density of Si particles than Al and the expansion of Si particles due to rapid melt cooling rate in the mold duringcentrifugal casting process. The three specimens with different values of melt temperature shows different size Si particles.The difference of Si particle size and distribution expected will influences the mechanical properties of Al LM6 fabricated.

Topics

• density
• impedance spectroscopy
• microstructure
• melt
• Silicon
• centrifugal casting