【摘要】 采用电子背散射衍射技术,借助取向成像分析软件,研究了搅拌头在不同转速下,6082-T6铝合金搅拌摩擦焊焊核区上表面晶粒形貌、晶界特征、织构组分的演化.结果表明,在搅拌针所引入的剪切应力作用下,焊核区形成(110)[001]高斯织构和(114)[22ˉ1]织构,轴肩的顶锻压力使其沿着TD方向旋转一定角度,形成(112)[11ˉ1]铜织构,随着搅拌头转速的提高,晶粒沿着TD方向旋转角度增加,进一步形成(100)[011]剪切织构和(11ˉ1)[112]织构;焊核区晶粒受到搅拌针的挤压而形成[110]丝织构,搅拌头转速从1 200 r/min提高到2 000 r/min时,挤压程度增加,导致[110]丝织构组分显著增多.更多还原

【Abstract】 The evolutions of grain morphology, grain boundary features and texture components on the upper surface of friction stir welding nugget for 6082-T6 aluminum alloy at different rotation speeds of tool were studied by electron backscatter diffraction technology combined with orientation analysis software. The results indicated that the(110) [001]Goss texture and(114)[2 211] texture were formed in the nugget zone under the shear stress introduced by the pin, and the upsetting pressure of the shoulder made it rotate to certain angle along the transverse direction, leading to the formation of(112)[1111 ] copper texture. With elevating the rotation speed of tool, the rotation angle of grains along the transverse direction increased, resulting in the further formation of(100) [011]shear texture and(1111)[112] texture. [110] fiber texture was formed by extrusion of grain in nugget zone by pin. When the rotation speed of tool was elevated from 1 200 to 2 000 r/min,the extrusion degree was increased, which resulted in a significant increase in the components of [110] fiber texture.更多还原