✍ Scribed by S.L. Raghunathan; A.M. Stapleton; R.J. Dashwood; M. Jackson; D. Dye
No coin nor oath required. For personal study only.
The lattice strain evolution in near-b Ti-10V-2Fe-3Al during room temperature tensile loading has been characterised in the asforged and forged and aged conditions using in situ synchrotron X-ray diffraction. As expected, the fine scale a which precipitates during aging strengthens the b-phase much more effectively than the a 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 b-phase E 200 increases from 45 GPa in the asforged 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 b-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.
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