Effect of Friction Stir Processing on the Microstructure and Mechanical Properties of Aluminum Alloy 702020191001 63939 167ghfa (original) (raw)
2014, 12th International Conference on Mining, Petroleum and Metallurgical Engineering
In this study, a 10 mm thick AA7020 plate is friction stir processed (FSP) to a depth of 6mm using two different tool geometries of threaded and unthreaded pin and different friction stir processing speeds of 20, 40, 60 and 80 mm/min at tool rotation rate of 560rpm. The microstructure is investigated initially using optical microscopy. The mechanical properties of the processed material are characterized using tension testing and hardness testing. The tension test is carried out along the FSP direction and the hardness is measured mainly for the processed zone and compared with the base material. Microstructure investigation showed significant grain refining in the processed zone. In all the conditions studied, the processed zone showed a lower hardness as compared to the base metal. This suggests the dissolution of precipitate particles due to the frictional heat that softens the material. The tensile strength of the FS processed specimens was significantly increased by up to 14% as compared to the base metal. All specimens invariably showed considerable increases in the ductility by up to 75%. The use of the unthreaded pin showed better ductility and strength.
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