High strain rate superplasticity in ultrafine-grained Ti-4.5Al–3V–2Mo–2Fe alloy

作者：Peng Han, Jun Cai, Ke Qiao, Fengming Qiang, Wen Wang, Kuaishe Wang · 发表于：Journal of Materials Research and Technology · 年份：2025 · DOI：10.1016/j.jmrt.2025.05.184 · 被引用次数：6 · 研究领域：Titanium Alloys Microstructure and Properties、Microstructure and mechanical properties、Advanced materials and composites

High strain rate superplasticity (≥1 × 10 −2 s −1 ) has been widely reported in low-melting-point materials such as aluminum and magnesium alloys, but remains underdeveloped in high-melting-point materials, particularly titanium alloys. This work developed an ultrafine-grained Ti-4.5Al–3V–2Mo–2Fe alloy with a micro-network β phase by double side-friction stir processing and the alloy achieved excellent high strain rate superplasticity. Especially at 700 °C and 9 × 10 −2 s −1 , the superplastic elongation reached 3800 %, which due to the micro-network β phase pinned the ultrafine-grained α grains, facilitating the dislocation slip-coordinated grain boundary sliding process. This work offered great application potential in high strain rate superplastic forming for the alloy.