Effects of temperature and grain size on active twinning systems in commercially pure titanium

ABSTR A C T In order to clarify the effects of grain boundary, grain size and deformation temperature on twinning de-formation in polycrystalline commercially pure titanium, active twinning systems during compression deformation at temperatures from 25 degrees C to 800 degrees C investigated using SEM/EBSD techniques. Four twinning systems were confirmed to operate under compression at 10% strain in a deformation temperature de-pendent manner: {1121} and {1122} twins were observed only at relatively low temperatures (e.g. <= 400 degrees C), while, {1011} twins were observed at relatively high temperatures (e.g. >= 400 degrees C), and {1012} twins formed at every tested temperature (25 degrees C-80 0 degrees C). Our results suggested that the effects of strain concentration at grain boundaries on twinning differ based on the active twinning systems, which are affected by: 1) the difference in the formation temperature ranges between single-crystal and polycrystalline specimens, 2) the ratio of the number of deformation twins touching grain boundaries to the total number of deformation twins, and 3) grain size dependence. (c) 2021 Elsevier B.V. All rights reserved.