2019 Volume 60 Issue 9 Pages 1890-1897
The effect of heat treatment temperature on texture formation in Ti–5.5Mo–8Al–6Zr (mol%) alloy sheets was systematically investigated in this study. α′′ martensite was induced by cold-rolling. Although the deformation texture of α′′ martensite could not be detected, the formation of {130}α′′⟨310⟩α′′ and (100)α′′[010]α′′ textures was proposed. The specimen heat-treated at 1073 K or higher consisted of a single β phase, and Goss, {110}β⟨113⟩β, and Brass orientations were formed as the recrystallization textures. The Goss orientation, which is irregular for β-Ti alloys, developed with increasing heat treatment temperature, and became the dominant component in the specimens heat-treated at 1173 K. The specimen heat-treated at 973 K consisted of the β + α phase. {113}β⟨110⟩β, {113}β⟨141⟩β, {223}β⟨252⟩β, {223}β⟨692⟩β, and {332}β⟨113⟩β were formed in the β phase, whereas {1120}α⟨1100⟩α–{1122}α⟨1100⟩α was formed in the α phase. Transmission electron microscopy observations revealed that the specimen heat-treated at 973 K was not completely recrystallized. This microstructural difference led to a difference in texture components between the specimens heat-treated at 973 K and at 1073 K or higher.
