Friction stir processed of 6061-t6 aluminum alloy reinforced with silica from rice husk ash

Abstract

This paper presents a development of a composite using friction stir process of AA606-T6 aluminum alloy reinforced with amorphous silica obtained from rice husk ash. The amorphous silica was produced after acid leaching and calcinations at 500�C. The silica powder was placed into a groove that was made in the joining line of AA606-T6 plates prior to friction stir process. Hard silica particles restricted the grain growth of aluminum matrix that contributed to a slight increase in hardness. Hardness decreases in zones under the tool was observed because AA6061-T6 alloy was sensitive to friction heat generated by the tool. Ageing at 200�C increased the hardness of the aluminum in the friction stir process zones. � (2014) Trans Tech Publications, Switzerland.