Fabricating a high strength-ductility Ti2AlNb alloy sheet by continuous pack rolling

As a lightweight, high-temperature structural material, Ti2AlNb alloys have great application prospects for the new generation of high-performance engines. For Ti2AlNb alloy, achieving the synergy between the strength and plasticity is challenging and critical. In previous work, it was found that high strength-ductility Ti2AlNb alloy can be fabricated by spark plasma sintering (SPS) and rolling. However, reheating between the adjacent rolling is needed, which inevitably decreases the production efficiency. In this work, Ti2AlNb alloy sheet is fabricated using continuous rolling by cancelling the reheating procedure between the adjacent rolling, trying to increase its productivity. Results show that no crack forms on the sheets after a 70 % thickness reduction with two rolling passes. Microstructural analysis shows that numerous nano-size O phases form in the Ti2AlNb alloy, and the O phases near the dislocation aggregation region exhibit larger size. Tensile tests show that the Ti2AlNb sheet obtained in this work has both high tensile strength and good ductility. This work provides a referential value for fabricating high strength-ductility Ti2AlNb alloy.