Specific features of crystallographic texture formation in BCC-FCC transformation in extruded brass

•Orientation microscopy was used to study the evolution of a crystallographic structure in brass at βBCC→αFCC transformation.•Four primary orientations of βBCC texture are transformed into three primary orientations of αFCC.•β→α-transformation occurs as per ORs close to K-S or N-W.•Nuclei of the α-phase are formed at boundaries between β-phase grains.•The β boundaries, where nuclei α are formed, are close to the CSL boundaries Σ3 and Σ33c. Crystallographic features of body-centered cubic to face-centered cubic transformation were studied in an extruded brass product. X-ray phase analysis, scanning electron microscopy with electron microprobe analysis, and orientation microscopy based on diffraction of back-scattered electrons were used. A sample after treatment consisted of the β′-phase (Cu0.55Zn0.45, structural type B2) and α-phase (Cu0.65Zn0.35, structural type A1) at 30:70. Integral textures (within the product) of phases were axial with axes parallel to the elongation direction in extrusion:for β’ andfor α. Local textures of phases are described as limited and consisting of a set of components. For β′ – {001}, with scattering up to± 25° around the axis; and {110}consisting of three components – one {110}and two {110} ± 24° around the axis; for α – {001}(strong) and two of {110}(weak). It was shown that components of local textures of the β′- and α-phases were associated by orientation relationships close to Kurdjumov-Sachs orientation relationships. A small number of limited textural components formed as a result of β(BCC)→α(FCC) transformation realized as per multi-variant orientation relationships is explained by the formation of nuclei of a new phase at special boundaries close to coincidence site lattice boundaries Σ3 and Σ33.