The effect of modifying microstructure and texture by electric current on mechanical properties of electrically assisted stationary shoulder friction stir welded Ti6Al4V alloy were investigated. The width of the ‘bowl-shaped’ stir zone gradually increased with the increasing current value and texture of the joints changed abruptly with an increasing current from 0 to 300 A. The macrozones consisting of similar orientated grains in the heat-affected zone have the highest deformation degree and the lowest hardness, while macrozones were not seen in the stir zone of both the friction-stir welded joints and the electrically assisted joints. Why the tensile strength and elongation reached the highest at a current of 300 A was explained in terms of microstructure and texture.

研究了电流改变显微组织和织构对电辅助固定台肩搅拌摩擦焊 Ti6Al4V 合金力学性能的影响。“碗状”搅拌区的宽度随着电流值的增加而逐渐增加，接头的织构随着电流从 0 到 300 A 的增加而突变。热影响区中由相似取向晶粒组成的宏观区具有最大变形程度和最低硬度，而搅拌摩擦焊接接头和电助焊接头的搅拌区均未观察到宏观区。从微观结构和织构方面解释了为什么在 300 A 的电流下拉伸强度和伸长率达到最高。