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Study on Multi-Step Deformation Mechanisms and Synergistic Regulation of Strength and Ductility in Ti-2Al-2.5Zr Alloy Tubes for Nuclear Power Applications
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DOI：10.1002/rar2.70323.png)
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Abstract
En 中文
To overcome the strength–ductility trade-off in fabricated Ti-2Al-2.5Zr alloy tubes, we systematically investigated the microstructural evolution and mechanical behavior throughout thermomechanical processing, including hot working (forging and extrusion) and cold multi-pass rolling. The results reveal that hot forging promotes limited concurrent discontinuous and continuous dynamic recrystallization (DDRX and CDRX), resulting in a microstructure dominated by high-dislocation-density substructures. In contrast, hot extrusion is primarily driven by CDRX through mechanisms of subgrain rotation and grain fragmentation, thereby refining the grain size to 4–8 μm and achieving a synergistic improvement in strength and ductility. This refined and homogeneous microstructure provides a requisite plasticity reserve for subsequent cold rolling, thereby mitigating the risk of cracking. In the cold rolling stage, {10 2} extension twinning is activated initially, coordinating strain and optimizing texture through an ∼85° lattice reorientation, which facilitates the transition from basal to prismatic texture. This transition promotes sustained prismatic slip activation. Subsequently, dislocation slip dominates, leading to significant dislocation hardening. The synergistic effect of texture optimization and dislocation hardening ensures both high strength and retained ductility. Consequently, the processed tubes exhibit an excellent combination of ultimate tensile strength (852 MPa) and elongation (11.0%). This study elucidates the intricate interplay among processes, microstructure, and properties, providing a new paradigm for manufacturing high-performance titanium alloy tubes.
Keywords:
deformation mechanisms
strength-ductility balance
substructure
Ti-2Al-2.5Zr alloy
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