Atomic scale mechanism of reorientation induced plasticity in titanium alloys - experimental and first principles investigation of the mobile {134‾1} interfaces

• DOI: 10.1016/j.matdes.2024.112947
• Publication Date: 2024-05-03T01:28:46Z
• Authors: P. Kwasniak; O. Dumas; L. Malet; M. Muzyk; M.R. Zemła; S. Godet; F. Prima
• Keywords: Titanium alloy; Burgers vector

Recent experiments identified a new type of stress induced structural transformation allowing to combine high strength, great work hardening and good ductility in multiphase Ti alloys. These properties are achieved through reorientation the α′ martensite plates being specific self accommodating II twin relation, i.e. under applied load one variant reconfigure its twinned configuration with visible motion boundary. This mechanism plastic deformation was never observed before thus, current understanding is fragmentary. In this article we present results experimental observations ab initio calculations twins determining crystallography formation, structure energy interface as well mobility corresponding twinning disconnections. It found that investigated boundary has lowest among known modes hexagonal Ti. Moreover, disconnections smallest Burgers vector step height comparison other active systems. As result, these highly mobile which rationalize migration boundaries at straining. Furthermore, can be adjusted by particular alloying elements enabling conscious development alloys exhibiting plasticity.