Evolution of grain boundary and texture in TC11 titanium alloy under electroshock treatment

This work investigated the evolution mechanism of grain boundaries in TC11 alloy after electroshock treatment (EST) using electron back scatter diffraction (EBSD) and transmission electron microscopy (TEM). TEM results showed that abundant alpha martensite (alpha M) phase was precipitated after EST with 0.06 s. EBSD results indicated that the percentage of high angle misorientation grain boundaries (HAGBs) in beta phase increased from 3.74% before EST to 11.15% after 0.04 s EST, without evident change in proportion of alpha phase, which resulted from the low angle misorientation grain boundaries (LAGBs) of secondary alpha (alpha s) and beta phase migrated to the alpha/beta phase boundaries to form HAGBs during the alpha s to beta phase transformation. The proportion of HAGBs in alpha phase increased from 23.16% before EST to 76.61% after 0.06 s EST, caused by the accumulation of LAGBs at the alpha/beta phase boundaries to form HAGBs. The values for misorientation angle preference selection of alpha phase located around 60 & DEG; and 90 & DEG; were changed to 30 & DEG; in HAGBs of beta phase, and the texture distribution of alpha phase was uniform with maximum intensity of 5.47 after EST by 0.06 s (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study investigated the evolution mechanism of grain boundaries in TC11 alloy after electroshock treatment. The results showed that abundant alpha martensite phase was precipitated after the treatment. The percentage of high angle misorientation grain boundaries in the beta phase increased, and the misorientation angle preference of the grain boundaries changed.