Effect of texture and mechanical anisotropy on flow behaviour in Ti–6Al–4V alloy under superplastic forming conditions

The dependency of anisotropic flow behaviour on crystallographic texture is investigated in Ti–6Al–4V alloy at 750 °C and 900 under constant strain rates 10?2, 10?3 2 × 10?4 s?1. evolution microstructure during these test conditions has been studied using electron backscatter diffraction (EBSD). Anisotropic stress was observed irrespective the applied rate. maximum this temperature recorded for samples with their lengths perpendicular to rolling direction (RD), which had <0001>//Transverse Direction (TD) ± 20°, Basal TD texture. presence a banded appeared be prime reason tensile behaviours lower temperatures. However, higher isotropic deformation achieved disregarding sample orientations, i.e., parallel or RD. Rachinger grain boundary sliding along ?-? boundaries, accommodated by intragranular slip, seen contribute towards total RD deformed s?1 As such, dominant mechanism °C. On other hand, although exhibiting behaviour, same not rate (2 s?1). Thus thought dominating orientation potentially Lifshitz active. It concluded that despite having strong effect microstructural determines (i.e., Rachinger, Lifshitz) superplastic driven.