Micromechanics of Ti-10V-2Fe-3Al: In situ synchrotron characterisation and modelling

The lattice strain evolution in near-P Ti-10V-2Fe-3Al during room temperature tensile loading has been characterised in the as-forged and forged and aged conditions using in situ synchrotron X-ray diffraction. As expected, the fine scale alpha which precipitates during aging strengthens the beta-phase much more effectively than the alpha present in the forged sample. The behaviour has been modelled using a two-phase elastic-plastic self-consistent (EPSC) model. It is found that the constrained beta-phase E-200 increases from 45 GPa in the as-forged condition to 88 GPa in the forged and aged material. C-11-C-12 increases from 12 to 47 GPa due to the increase in beta-stabiliser content, in agreement with atomistic predictions. The EPSC models are reasonably successful at reproducing the observed behaviour, but do not provide a complete description of the micromechanics of these materials. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.