Study of the Formation of the Texture of the bcc → hcp Phase Transformation in Ti, Zr, Mg–Li and Fe–Mn Alloys

Abstract—The formation of the texture of the bcc → hcp phase transformation was studied in VT23 alloy (Ti‒5.5Al–2Mo–4.5V–1Cr–0.6Fe), Mg–8Li–1Al alloy, and high-manganese steels Fe–15.9Mn and Fe–17.7Mn. It was shown that the texture of the β-phase in the VT23 and Mg–8Li–1Al alloys contains components of bcc metals, while the texture of the α-phase is single-component {110}〈100〉 prismatic and differs from the rolling textures of titanium and other metals with the hcp lattice. Variations in the texture of the ε-phase indicate that, during cold rolling, in Fe–17.7Mn steel, only the ε → α' transformation occurs, whereas in Fe–15.9Mn steel, along with the ε → α' transformation, the reverse α' → ε transformation occurs, as a result of which the (110) texture is formed in the ε-phase in the plane of the sheet, as in titanium and magnesium alloys. The lattice deformations as a result of the bcc → hcp transformation were calculated according to the Burgers orientation relationships and were compared with the sheet deformations during rolling. The comparison showed that, for all the studied materials, only one transformation variant occurs; it is characterized by a complete correspondence of the lattice and sheet deformations, in which the {001}〈110〉 orientation of the bcc phase is transformed into the {110}〈100〉 orientation of the hcp phase.