Tailoring hierarchical deformation mechanisms in metastable β titanium alloy via heterogeneous lamellar β structure design

作者：Hao Yang, Guodong Wang, Mingxiang Zhu, Jinhong Guo, Nana Chen, Hongchao Kou · 发表于：Materials Research Letters · 年份：2025 · DOI：10.1080/21663831.2025.2560530 · 被引用次数：5 · 研究领域：Titanium Alloys Microstructure and Properties、Intermetallics and Advanced Alloy Properties、Advanced materials and composites

The deformation mechanism of Ti-7Mo-3Nb-3Cr-3Al alloy was tailored by constructing heterogeneous lamellar β structure. This structural design induces hierarchical mechanism and thereby enhances work hardening and ultimate strength. During the initial deformation stage, α″ martensite and type I twins are activated. With increasing strain, {332}<113 > twins and stress-induced ω phase emerge along martensitic boundaries, forming a unique laminated deformation structure. Simultaneously, secondary martensite and β twins form within the β matrix, refining the matrix and hindering dislocation motion. This work provides novel insights into tailoring deformation behavior of metastable β titanium alloys.