Achieving excellent strength plasticity matching in low‐cost titanium alloy via nano‐twinning and hierarchical phase structure
Zhongli Qiao, Qin‐Yang Zhao, Zi‐Xuan Meng, Ping Guo, Runqi Zhang, Huan Wang, Cheng Lin, Kuaishe Wang, Yongqing Zhao
Abstract
Abstract The trade‐off between strength and ductility remains a significant challenge in titanium alloy development. Microstructural engineering is a cost‐effective alternative to balance strength and ductility. In this study, three microstructures were produced in low‐cost titanium alloys via solution treatment, and the alloys with α, α′‐martensite, and β phases exhibited an optimal strength–ductility combination. The hierarchical phase structure, α′‐martensite reorientation, multi‐oriented nanotwins, and dislocation interactions collectively contributed to its high yield strength (~ 1015 MPa), ultimate tensile strength (~ 1307 MPa), and satisfactory ductility (~ 13%). Importantly, this study reveals a new pathway for nanotwin formation in α′ phases and provides key insights for optimizing the mechanical properties of low‐cost titanium alloys.