Local strain evolution near α/β interface in TC11 titanium alloy under electroshocking treatment

Abstract

The evolution of local strain at α/β interface in TC11 titanium alloy under electroshocking treatment (EST) was investigated and quantified by Kernel average misorientation (KAM) and Geometrical phase analysis (GPA). The KAM results showed that the phenomenon of strain concentration weakened after EST with 0.04 s, and mass of strain in small area formed and distributed evenly after EST with 0.06 s. GPA analysis indicated that the annihilation of dislocation and lattice distortion near interface was the main reason for weakening the strain concentration during phase transition from αs to β after EST with 0.04 s. After EST with 0.06 s, the alternate appearance of severe defect area and the regular area near the interface resulted in the formation of small area strain, and the precipitation of fine αM phase inhibited the growth of strain area, which resulted in the even distribution of strain. This work can demonstrate the effect mechanism of EST on the local strain near the phase interface of titanium alloys and provide a theoretical basis for the microstructure manipulation of titanium alloys under EST.