Deformational behavior of face-centered cubic (FCC) phase in high-pure titanium

The deformation behavior of face-centered cubic (FCC) phase in annealed samples at room temperature was directly observed by Transmission electron microscope (TEM). It is found that FCC phase has excellent capacity of plastic deformation. Under cold-rolling, the FCC/HCP (hexagonal close-packed) phase interface slides and rotates, leading to deviation from the semi-coherent orientation relationship. The FCC phase has undergone various deformation modes such as shearing, bending, kinking and their combinations. With the increase of strain, the globularization of FCC phase is more remarkable, and bands are transformed into equiaxed grains. Kinking of FCC band structure under cold-rolling was first discovered in this work, which can lead to grain refinement and improve ductility. The globularization behavior of FCC phase is similar to that of alpha/beta lamellar starting structure in titanium alloy at high temperature. This provides a new idea for the design of microstructure and properties of titanium and its alloys.

Automated summary

In annealed samples at room temperature, the deformation behavior of the face-centered cubic (FCC) phase was directly observed using Transmission Electron Microscope (TEM). It was found that the FCC phase exhibits excellent plastic deformation capability and undergoes various deformation modes such as shearing, bending, and kinking during cold-rolling. As strain increases, the globularization of the FCC phase becomes more apparent, leading to refined grains and improved ductility through the kinking of the FCC band structure. The globularization behavior of the FCC phase is similar to that of the alpha/beta lamellar starting structure in titanium alloy at high temperatures, providing new insights for the design of microstructure and properties of titanium and its alloys.