Effect of deformation twinning on microstructure and texture evolution during cold rolling of CP-titanium

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2005-05, Vol.398 (1-2), p.209-219
• Main Authors: Chun, Y.B., Yu, S.H., Semiatin, S.L., Hwang, S.K.
• Format: Article
• Language: English
• Subjects: Cold rolling; Cross-disciplinary physics: materials science; rheology; Deformation twinning; Exact sciences and technology; Materials science; Microstructure; Other heat and thermomechanical treatments; Physics; Texture; Titanium; Treatment of materials and its effects on microstructure and properties
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2005.03.019

The evolution of microstructure and texture during cold rolling of commercial-purity titanium (CP-Ti) was studied with particular reference to deformation twinning and dislocation slip. For low to intermediate deformation up to 40% in thickness reduction, the external strain was accommodated by slip and deformation twinning. In this stage, both compressive ({1 1 2¯ 2}〈1 1 2¯ 3¯〉) and tensile ({1 0 1¯ 2}〈1 0 1¯ 1¯〉) twins, as well as, secondary twins and tertiary twins were activated in the grains of favorable orientation, and this resulted in a heterogeneous microstructure in which grains were refined in local areas. For heavy deformation, between 60 and 90%, slip overrode twinning and shear bands developed. The crystal texture of deformed specimens was weakened by twinning but was strengthened by slip, resulting in a split-basal texture in heavily deformed specimens.