Abstract
The metastable ω phase has an important effect on the properties of β Ti-Mo alloys. In order to control the appearance of ω phase, it is essential to understand the formation process of ω phase as a function of the Mo content. In the present study, we use the ab initio exact muffin-tin orbitals method in combination with the coherent potential approximation to investigate the process of β to ω phase transformation in Ti1−xMox (x = 0 ~ 0.2) solid-solution alloys. Results indicated that there exists an energy barrier hindering the spontaneous β to ω phase transformation. The total energy barrier derives from the lattice collapse and the lattice deformation. Compared with the lattice collapse effect on the energy barrier, the coherency strain energy caused by lattice deformation effect can be almost ignored.
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