Effect of drawing strain on microstructure and mechanical properties of 1350 aviation wire

The effect of drawing strain on the microstructure and properties of 1350 aerospace wire was investigated by electron backscattered diffraction (EBSD), transmission electron microscope (TEM) and ambient-temperature tensile test. The results show that the original 1350 aluminum rod has an equiaxed crystal structure, and the high-angle grain boundaries (HAGBs) account for a relatively high proportion. At the strains of 0.61 and 1.28, the grains are elongated to form a large number of cell block, and the proportion of the HAGBs is significantly reduced. At strain higher than 2.31, the grain boundaries of elongated grains are gradually parallel to the drawing direction, the cell block gradually transforms into a lamellar boundaries, and the proportion of HAGBs gradually increases. The texture types are different in different deformation stages. At strain less than 1.28, the wire is mainly made of 〈100〉 texture. At strain higher than 2.31, the intensity and volume fraction of 〈111〉texture increase continuously. The strengthening mechanism of wire is mainly dislocation strengthening and grain boundary strengthening. With the increase of the strain, the contribution of dislocation and grain boundary to the strength increases. When the strain reaches 3.90, the strong 〈111〉 texture has a relatively significant strengthening effect. © 2022, China Science Publishing & Media Ltd. All right reserved.