Alpha phase precipitation from phase-separated beta phase in a model Ti–Mo–Al alloy studied by direct coupling of transmission electron microscopy and atom probe tomography

Nucleation and growth of alpha precipitates during low-temperature annealing of Ti–10 at.% Mo–10 at.% Al alloy was investigated using direct coupling of transmission electron microscopy and atom probe tomography. The initial stages of annealing at 400 °C showed structurally well-defined alpha precipitates that were depleted in Mo as well as Al, and were confined within the Ti-rich beta phase separated pockets. The Al-enriched alpha phase was only observed after further annealing at 600 °C.