In the current study, the friction stir additive manufacturing (FSAM) technique was used to fabricate a three-layered build by using 3 mm thick sheets of AA5083 (top and bottom layer) and AA7075-T6 (middle layer) alloys. The effect of microstructure and texture evolution on the mechanical properties was studied comprehensively by using optical microscopy (OM), field emission scanning electron microscopy (FESEM), electron backscattered diffraction (EBSD), Vickers microhardness, and miniature tensile tests. Stir zones (SZ) along the build depth consist of fine equiaxed grains with complete intermixing of materials. The top and bottom region of the build shows appreciable strength and microhardness in comparison to BM (AA5083). The precipitate dissolution due to the multiple thermal cycles is the main contributing factor to decreased strength and microhardness in the middle region of the build. Microstructure gradients are observed owing to varying degrees of temperature gradient along the build depth. Texture analysis reveals the presence of ideal shear texture components A₁*/A_2*, B/B̅, and C in the stir zones of the fabricated build, which suggests the presence of sufficient heat input during processing. The orientation distribution function (ODF) signifies the presence of recrystallization texture (Cube, P, and Goss) and plain strain texture (Brass and S) components in the SZ.

在目前的研究中，搅拌摩擦增材制造 (FSAM) 技术用于通过使用 3 毫米厚的 AA5083（顶层和底层）和 AA7075-T6（中间层）合金片材制造三层结构。采用光学显微镜（OM）、场发射扫描电子显微镜（FESEM）、电子背散射衍射（EBSD）、维氏显微硬度和微型拉伸试验，综合研究了显微组织和织构演变对力学性能的影响。沿构建深度的搅拌区 (SZ) 由精细的等轴晶粒组成，材料完全混合。与 BM (AA5083) 相比，构建的顶部和底部区域显示出明显的强度和显微硬度。由于多次热循环导致的沉淀物溶解是造成结构中间区域强度和显微硬度降低的主要因素。由于沿构建深度的不同程度的温度梯度，可以观察到微结构梯度。纹理分析表明存在理想的剪切纹理成分 A₁ */A _2*、 B/B̅ 和 C 在预制构件的搅拌区，这表明在加工过程中存在足够的热量输入。取向分布函数 (ODF) 表示 SZ 中存在再结晶织构（Cube、P 和 Goss）和平面应变织构（Brass 和 S）成分。