Influence of Heat Treatment on the Density and Surface Roughness Aluminum Alloy-Coal Bottom Ash Particle (5 Wt%) Composites for Bolts and Nuts Applications

Mastuki, Mastuki and Seputro, Harjo and Abdulrahim, Muslimin Influence of Heat Treatment on the Density and Surface Roughness Aluminum Alloy-Coal Bottom Ash Particle (5 Wt%) Composites for Bolts and Nuts Applications. Springer. (Submitted)

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Abstract

Metal composite or better known as Metal Matric Composite (MMC) is a combination of two or more materials, in which the metal as a matrix and ceramic as an amplifier exist to obtain the desired characteristics. To produce solid components and fine microstructure in its manufacture, the squeeze casting process has an approximate capability. In the manufacture of aluminum matrix composite, to obtain better mechanical properties such as hardness and strength, it is required existence of T6 heat treatment process. The purpose of this research is to analyze the influence of pouring temperature and pouring time variation on squeeze casting process to density and surface roughness of 6061 coal bottom ash composite. The research method consists in casting aluminum 6061 to melt at 660 °C and then adding coal bottom ash electroless plating and magnesium, the temperature is increased with variation of casting temperature 675, 700 and 725 °C. Pouring is performed for 60, 90, 120 s with following pressing under a 20 kgf load. Then we carry out T6 heat treatment. The tests include density testing and surface roughness testing. The results of the research on the density test showed that the value of density after the T6 heat treatment is greater. This shows the presence of expansion and shrinkage during the T6 heat treatment process. Based on the results of the surface roughness testing, the grown value of the roughness after T6 treatment is between 5 and 10% of the initial roughness value before T6.

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