Thermal stability of deformation twins in cryogenic rolled CP-Ti

In this work, abundant types of deformation twins were introduced in CP-Ti by cryogenic rolling. The stability of the twins under the annealing process and their contribution to texture were investigated. The EBSD results revealed that {112¯2} compression twins as the primary twin result in the texture with c-axis near ND and RD, while {101¯2}and {112¯1} tension twins as the primary twin induce the texture with c-axis nearly parallel to TD. Besides, the asymmetric texture intensity of the as-received sheet will be improved by the reorientation induced by deformation twins during the annealing process. Most twins show good thermal stability during the annealing process at 550 °C, however, all twins rapidly disappeared at 650 °C. The {101¯2} twins are the most thermally stable during annealing treatment at 600 °C. After full recrystallization, the texture induced by matrix reorientation maintains, while the texture associated with primary twins recovers.