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Shude Ji,Zhengwei Li 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6
Using magnesium alloy as upper sheet, 3 mm-thick AZ31 magnesium alloy and 6061 aluminum alloy were joinedusing friction stir lap welding assisted by stationary shoulder. The effects of tool rotating speed on cross-sections,microstructure and mechanical properties of Mg/Al lap joints were mainly discussed. Results showed thatstationary shoulder contributed to joint formation, by which stir zones (SZ) were characterized by big onionrings after welding. Because of the big forging force exerted by stationary shoulder, the upper region of hookwas well bonded. SZ showed much higher hardness because of intermetallic compounds (IMCs). The bondingconditions at the base material (BM)/SZ interface at advancing side and the hook region played important roleson joint lap shear properties. The X-ray diffraction pattern analysis revealed that the main IMCs were Al3Mg2and Al12Mg17.
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.