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Understanding the β-phase texture development in Ti-6Al-4V during compression in the α+β regimes [Preprint]

Nguyen, Chi-Toan; Balzer, Mario; Witulski, Thomas; Böhm, Markus; Dod, Benjamin; Preuss, Michael; Quinta da Fonseca, João

A preprint of a conference paper for The 14th World Conference on Titanium, presented on June 10th - 14th, 2019 in Nantes France, to be published in MATEC Web of Conferences.

Abstract: The β-phase texture development during α+β compression of Ti-6Al-4V was investigated at two temperatures in the α+β regime at strain rates of 0.005, 0.05 and 0.5s-1. It was found that the β-phase develops a strong {001}<100> (called 001β cube) texture and a weaker {111}<110> fibre (called 111β). The 001β texture is strengthened when increasing strain rates and temperature. The strong 001β is also found in single β-compression, due to recrystallization or high-strain rate sensitivity from literature. However, the strain-rate effect in the α+β regime cannot be explained by the two mechanisms. Simple crystal plasticity simulations were used to compare the disorientation between the undeformed and deformed β orientations in single or two-phase model and then in different relative strength of the α and β phase, which simulates the strain rate effects. There is significantly higher frequency of low-angle disorientation in the simulated samples having 001β cube and α-orientations or with the lower relative strength. Thus, the presence of suitably aligned α-orientations and the decrease in the strength ratio when increasing strain rates help stabilize the 001β orientation under α+β compression. These findings support the development of processing parameters to minimize the 001β texture and its deleterious effect on the strength of components.

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