FRICTION STIR PROCESSING OF Al-SiC COMPOSITE FOR SUPER PLASTIC FORMING
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Abstract
Friction stir processing (FSP) is one of the new and thermo mechanical processing
techniques that alters the micro structural and mechanical properties of the material in single pass
to achieve maximum performance with low production cost in less time using a simple and
inexpensive tool. Friction stir processing can reduce the grain size conferring excellent super
plastic behavior in aluminium alloys. The important aspects of the friction stir processing tool is
material selection, Tool Geometry, Load bearing ability, mechanisms of tool degradation and
process economics. Preliminary studies of different FS processed alloys report the processed zone
to contain fine grained, homogeneous and equiaxed microstructure. In the present work, sheets of
aluminum alloys were friction stir processed under various combinations of rotational and
translational speeds. The processing forces were measured during the process and the resulting
microstructure was analyzed. The grain refinement was observed to vary directly with rotational
speed and inversely with the translational speed
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