双极板用超薄钛箔材拉伸各向异性研究

Tensile Anisotropy of Ultra-Thin Titanium Foil for Bipolar Plates

摘要:

以不同批次双极板用超薄钛箔材为研究对象，通过常温拉伸试验获取了箔材的拉伸性能及各向异性，采用EBSD、三维轮廓仪等检测手段分析了织构、表面质量及形变孪晶等因素对箔材拉伸各向异性的影响，揭示了超薄钛箔材拉伸各向异性的主要影响因素。结果表明，各批次箔材均存在明显的拉伸各向异性，材料轧制方向的延伸率与强度高于垂直于轧制方向，相较于拉伸强度，材料的延伸率具有更高的各向异性敏感性；箔材的表面质量是影响其拉伸各向异性的主导因素，其制备过程中可通过提高表面质量以弱化箔材各向异性，从而大幅提高其综合力学性能。

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.