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                <term xml:lang="en">Ti-6Al-4V</term>
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              <p>Ti-6Al-4V is a widely used titanium alloy in superplastic forming process which requires high temperatures (T≈900 °C) and low strain rates (ε ˙≈〖10〗^(-3) s^(-1)). One way to reduce the costs of the process is to use a lower forming temperature and/or higher strain rate, up to 〖10〗^(-2) s^(-1). However, the behavior of Ti-6Al-4V alloy still need to be modeled at such forming conditions and for different initial microstructure. In order to characterize the mechanical behavior of Ti-6Al-4V at temperature between 400 °C and 700 °C, relaxation and tensile tests performed under small and large deformation conditions were conducted. Depending on the test, the deformations were evaluated through two kinds of measurements, respectively with an extensometer and with a digital image correlation technique (DIC). Similar experimental results were obtained, validating the use of DIC at high temperature to evaluate high strain levels. Two different microstructures of Ti-6Al-4V alloy were tested to study the impact of the initial microstructure on the mechanical behavior. For similar conditions of strain rate and temperature, representative of the forming process, a fine-grained microstructure exhibits an enhancement of mechanical behavior in comparison with the classical coarse-grained microstructure used in the current industrial process. Finally, an elasto-viscoplastic has been identified for each microstructure.</p>
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