Effect of Cross Rolling on Texture Evolution and Mechanical Properties of Pure Titanium Bipolar Plates for Hydrogen Fuel Cells

LIU Congxian; LIU Pei; WANG Aiqin; XIE Jingpei; LI Bobo; TAO Huifa; WANG Fei

doi:10.3969/j.issn.1674-6457.2025.08.005

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (8) : 44-51. DOI: 10.3969/j.issn.1674-6457.2025.08.005

Light Alloy Forming

Effect of Cross Rolling on Texture Evolution and Mechanical Properties of Pure Titanium Bipolar Plates for Hydrogen Fuel Cells

LIU Congxian¹, LIU Pei^1,2,*, WANG Aiqin^1,2, XIE Jingpei^1,2, LI Bobo³, TAO Huifa³, WANG Fei³

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Abstract

The work aims to explore the texture evolution law of TA1 titanium foil during rolling by changing the rolling deformation, so as to improve the anisotropy of titanium foil. A pure titanium plate was prepared by electron beam melting furnace, and then the titanium foil of 0.5 mm was obtained after annealing for 3 h after several hot rolling. The titanium foil was cross rolled at room temperature to obtain samples with 10%, 30%, and 50% deformation. The microstructure, texture evolution, mechanical properties and fracture morphology of the titanium foil with different rolling deformation were characterized and analyzed by metallographic microscope, electron backscatter diffraction technique, electronic universal testing machine and field emission scanning electron microscope. With the increase of rolling deformation, the grain was gradually refined and the number of twins was gradually increased. The twin boundary hindered the dislocation movement and significantly improved the tensile strength of the titanium foil. Under the condition of low deformation (0%-30%), the effect on anisotropy was small. When the deformation was 50%, the substrate texture was more dispersed, and the yield strength tended to be uniform, showing weak anisotropy. The strength of TA1 titanium foil showed a rising trend with the increase of rolling deformation. The tensile strength of the original titanium foil in TD and RD directions was 167 MPa and 150 MPa, respectively. When the rolling deformation was 50%, the tensile strength reached 501 MPa (TD) and 492 MPa (RD). The tensile fracture morphology of the titanium foil under different rolling deformation was generally consistent, which was composed of dimples and ductile fracture. In conclusion, when the cross rolling deformation is 50%, the vertical and horizontal difference decreases and the basic surface texture is dispersed, which improves the strength of the material and the anisotropy of the titanium foil effectively.

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TA1 titanium foil / cross rolling / anisotropy / texture evolution / mechanical properties

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LIU Congxian, LIU Pei, WANG Aiqin, XIE Jingpei, LI Bobo, TAO Huifa, WANG Fei. Effect of Cross Rolling on Texture Evolution and Mechanical Properties of Pure Titanium Bipolar Plates for Hydrogen Fuel Cells[J]. Journal of Netshape Forming Engineering. 2025, 17(8): 44-51 https://doi.org/10.3969/j.issn.1674-6457.2025.08.005

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