Yin Jialin, Liu Jie, Wu Chuansong
MOE Key Laboratory for Liquid-Solid Structure Evolution and Materials Processing, Institute of Materials Joining, Shandong University, Jinan 250061, China.
Materials (Basel). 2024 Aug 14;17(16):4044. doi: 10.3390/ma17164044.
Friction stir welding (FSW) and ultrasonic vibration enhanced FSW (UVeFSW) experiments were conducted by using 6061-T6 Al alloy and AZ31B-H24 Mg alloy sheets of thickness 2 mm. The suitable process parameters windows were obtained for the butt joining of Al/Mg sheets. The effect of ultrasonic vibration on the macrostructure and mechanical properties of the dissimilar joints was studied. The results showed that the width of the weld nugget zone (WNZ) was enlarged to some extent and the hardness distribution in WNZ was more uniform in UVeFSW. In addition, the application of ultrasonic vibration effectively promoted the interpenetration degree of dissimilar materials in the WNZ so that the mechanical interlocking on the bonding interface of dissimilar Al/Mg materials was enhanced. The facture positions were changed from the bonding interface in FSW to the boundary between WNZ and the thermo-mechanical affected zone, and the ductile fracture zone was expanded. The highest ultimate tensile strength was 205 MPa at the process parameters set of 1200 rpm-50 mm/min in UVeFSW in this experiment. The average ultimate tensile strength of FSW/UVeFSW joints was 172.3 MPa and 184.4 MPa, respectively, and the average ultimate tensile strength was increased by 7.02% with the introduction of ultrasonic vibration.
采用厚度为2mm的6061-T6铝合金板材和AZ31B-H24镁合金板材进行了搅拌摩擦焊（FSW）和超声振动增强搅拌摩擦焊（UVeFSW）实验。获得了铝/镁板材对接焊接的合适工艺参数窗口。研究了超声振动对异种接头宏观组织和力学性能的影响。结果表明，在UVeFSW中，焊核区（WNZ）宽度有所增大，且WNZ内硬度分布更均匀。此外，超声振动的施加有效地促进了WNZ中异种材料的互穿程度，从而增强了异种铝/镁材料结合界面上的机械互锁。断裂位置从FSW中的结合界面变为WNZ与热机械影响区之间的边界，且韧性断裂区扩大。在本实验中，UVeFSW在1200 rpm-50 mm/min的工艺参数设置下，最高抗拉强度为205MPa。FSW/UVeFSW接头的平均抗拉强度分别为172.3MPa和184.4MPa，引入超声振动后平均抗拉强度提高了7.02%。
