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Lin Ma,Changzhuang Zhou,Yao Shi,Qinghe Cui,Shude Ji,Kang Yang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Conventional friction stir processing (FSP) and ultrasonic-assisted friction stir processing (Ua-FSP) were applied to modifythe microstructure and enhance the mechanical properties of as-cast A356 aluminium alloy. A series of experiments withdifferent processing parameters were conducted in these two processing methods. Forming characteristics, grain-refinement,and mechanical properties in FSP and Ua-FSP were compared to determine the effect of ultrasound. The results revealed thatultrasound improved the grain-refinement level in both grain size and grain uniformity. Further, the effect of ultrasound onmicrostructural evolution was more significant with relatively high processing heat-input. Ultrasonic vibration also positivelyaffected the hardness, tensile strength, and elongation.