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Further investigation at annealing at higher temperature i.e. 400\textdegree Celsius suggests that $\alpha$ particles coarsened and the $\omega$ particles are greatly dissolves. HRTEM images shoe well developed HCP structure of $\alpha$ particles visible at a/b interface. These images show a clear depletion of $\beta$ stabilizers from $\alpha$ regions and vice versa. At higher annealing temperature a greater coarsening of $\alpha$ principates is observed
All in all the studies suggest that the w assisted nucleation of $\alpha$ is a mix mode operation that involves both diffusional as well as displacive mechanisms. It suggests that while the phase may form due to displacement of $\omega$ precipitate with $\alpha$ the size and morphology of $\alpha$ greatly depends on the heat treatment, the cooling rate heating temperate as well as presence of $\alpha$ stabilisers and destabilisers. The $\alpha$ particles have a plate like shape and form inside the $\beta$ grain. The orientation of $\alpha$ with $\beta$ observes burgers orientation. It is also observed that nucleation is very slow for $\alpha$ particles, much lower than equilibrium at early stages but after annealing at high temperature $\alpha$ particles grow and lead to alloy partitioning and eventually lead to equilibrium.
Heating the Ti-5553 also suggest that heating at high temperatures, namely at 600 degree Celsius or annealing at low temperature 350 degree Celsius but as a 2 stage process shows similar clustering and formation of a precipitates.
