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

2005; Elsevier BV; Volume: 398; Issue: 1-2 Linguagem: Inglês

10.1016/j.msea.2005.03.019

1873-4936

Y.B. Chun, S.H. Yu, S. L. Semiatin, Sun Kwang Hwang,

Titanium Alloys Microstructure and Properties

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 ({112¯2}〈112¯3¯〉) and tensile ({101¯2}〈101¯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.