The commensurate and incommensurate structural configurations underlying the diffuse scattering from athermal {omega} found in the as-quenched {beta} phase of Ti with 8 and 15 at. % Mo have been investigated by high-resolution electron microscopy. Image interperetations were based on a simulation code developed via observed images of the commensurate {omega} phase formed by annealing Ti-8 at. % Mo. Athermal {omega} is observed as linear structural arrays or strings'' of <1.5 nm length. When commensurate (in quenched Ti-8 at. % Mo), the strings are confined {l angle}111{r angle} directions which are parallel to the longitudinal displacement wavevector associated with this phase transformation. However, when the athermal {omega} is incommensurate (in quenched Ti-15 at. % Mo), the strings tend to deviate from this direction. Atomic models for one- and two-dimensional transition structures are proposed. 17 refs., 8 figs.
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Schryvers et al. (1990) studied this question.