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

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 beta'-phase (Cu0.55Zn0.45, structural type B2) and alpha-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: < 110 > for beta' and < 100 > for alpha. Local textures of phases are described as limited and consisting of a set of components. For beta' - {001} < 110 > , with scattering up to +/- 25 degrees around the axis < 110 > ; and {110} < 110 > consisting of three components - one {110} < 110 > and two {110} +/- 24 degrees around the axis < 110 > ; for alpha - {001} < 100(strong) and two of {110} < 111 > (weak). It was shown that components of local textures of the beta'- and alpha-phases were associated by orientation relationships close to Kurdjumov-Sachs orientation relationships. A small number of limited textural components formed as a result of beta(BCC)->alpha(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 Sigma 3 and Sigma 33. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

The crystallographic features of body-centered cubic to face-centered cubic transformation in extruded brass product were studied using X-ray phase analysis, scanning electron microscopy with electron microprobe analysis, and orientation microscopy. The integral textures of phases within the product were axial with axes parallel to the elongation direction in extrusion, while local textures of phases were described as limited and consisting of a set of components. The components of local textures of the beta'- and alpha-phases were associated by orientation relationships close to Kurdjumov-Sachs orientation relationships.