EFFECTOFROTATIONALSPEED (Ù) ON THE PARTICLES BREAK UPAND HARDNESS VALUES IN ۲۰۲۴-T۸۵۱ FRICTION STIR WELDS

Abstract:In this study, an effort has been made to determine the influence of rotational speed of tool on themicrostructure and hardness values of friction stir welded ۲۰۲۴-T۸۵۱ aluminum alloy. The microstructure of stir zonein the joints has been investigated. It was found that the particles such as Al۶(CuFeMn) particles are broken up duringfriction stir welding, and the degree of break up of these particles in the stir zone increases with increasing rotationalspeed. Since the break up of these particles and the recrystallization of new grains happen simultaneously, the brokenparticles would be placed in the grain boundaries. Moreover, the hardness value in the stir zone increases withincreasing rotational speed

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Keywords:Friction stir welding ، Aluminum alloys ، Microstructure ، Particles ، Hardness