- Conference date: 13-17 June 2004
- Location: Columbus, Ohio (USA)
Computer models of metal flow and texture evolution during hot working require accurate descriptions of deformation mechanisms and constitutive behavior. Such descriptions for titanium alloys can be very complex because of the variety of slip systems in the hexagonal (alpha) phase, let alone the complications associated with the deformation of two‐phase (alpha/beta) microstructures in commercial alloys. Methods to elucidate the deformation behavior of unalloyed alpha titanium and two‐phase Ti‐6Al‐4V will be described. First, the analysis of the hot deformation of heavily textured bar and plate materials will be described. In these instances, the anisotropy in flow stress and in sample deformation pattern have been used in conjunction with a crystal plasticity code to deduce the relative values of the critical resolved shear stresses for basal 〈a〉, prism 〈a〉, and pyramidal 〈c+a〉 slip. Analysis of the flow curves has also provided insight into the micromechanism of flow softening in two‐phase alloys with colony‐alpha microstructures. To complement this work, an x‐ray line broadening technique was developed to deduce the relative slip activity at large strains in unalloyed titanium and Ti‐6Al‐4V. These measurements also provided estimates of the dislocation density as a function of temperature and the competition between slip and twinning at cold‐working temperatures.
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