Abstract:The tensile properties and anisotropy of different batches of ultra-thin titanium foils for bipolar plates were studied through room temperature tensile tests. The effects of texture, surface quality, and deformation twin on the tensile anisotropy of ultra-thin titanium foil was analyzed using detection methods such as EBSD and 3D profilometer, revealing the main influencing factors of tensile anisotropy. The results show that there is significant tensile anisotropy in all batches of foil, and the elongation and strength in the rolling direction are higher than those in the transverse direction. Compared with the tensile strength, the elongation of the material has a higher sensitivity to anisotropy. The surface quality of foil is the dominant factor affecting its tensile anisotropy. During the preparation process, improving the surface quality can weaken the anisotropy of the foil, thereby significantly improving its comprehensive mechanical properties.