Technical Session 5:

Title:         Analysis of the Influence of Speed Stirring Composite Aluminum Alloy with Stircasting Process
Authors:   Moch Helmi Jauhari, Wahyono Suprapto, Teguh Dwi Widodo, Suprianto
Abstract:  The composite material is a material composed of a mixture or combination of two or more of the major elements that macro differ in shape and material composition that basically can not be separated. In this research, the aluminum used was the outcome of production cesspool with the addition of volcanic dust from Mount Kelud by 1% as reinforcement.Stircasting process is the casting process by adding a material (powder form) in pure metal (aluminum), which has been melted and then stirring constantly. After that, the composite materials (the volcanic dust from Mount Kelud) were mixed slowly into the stirred liquid material. In this research, the variations of stirring speed were 200 rpm and 300 rpm.The stirring each time for 4 minutes.To know changes in material properties by testing the composition, micro structure, hardness and tensile.The result of this research showed that the speed of stirring influences the hardness and strength of the materials. For the stirring speed of 300 rpm obtained composite materials that are harde than the stirring speed of 200 rpm. And the result of metallographic testing was stirring speed could be effect for the amount and density of composite grain structure. The faster the stirring, the grain structure was getting smaller and closer.

Keywords:   Alumunium Composite, Volcanic Dust, Stircasting, Stirring Speed.
Pages:         148-157

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