The origins of flow softening during high-temperature deformation of a Ti-6Al-4V alloy with a lamellar microstructure

Abstract

Two different approaches were applied to describe flow softening during high-temperature deformation of Ti-6Al-4V with a lamellar microstructure. One was proposed on the basis of morphological evolution from lamellar to globular alpha particles while the other was suggested in the context of colony rotation and alpha particle coarsening. The former was not capable of predicting the flow behavior, implying that flow softening was less related to dynamic spheroidization. In contrast, the latter provided an accurate prediction of the flow response of the alloy with different alpha platelet thicknesses of 0.4-8.0 mu m over typical processing temperatures (815-950 degrees C) and strain rates (0.1 and 1.0 s(-1)). (c) 2013 Elsevier B.V. All rights reserved.