Alpha-beta Ti and Zr alloys are an important class of high strength alloys used in aerospace and nuclear power generation. They are unique in that their mechanical properties can be tailored by thermomechanical processing which consists of hot deformation and annealing. Although the basic physical processes occurring during this process are known, it is still not possible to computationally model the thermomechanical process and its effects on the property. This is because, during the process, several different physical processes are active which interact with each other in a complex way. Neutron diffraction makes it possible to study these processes in-situ and obtain unique data that can be used to decouple these interaction and help develop computational models. These models can then be used to optimise the process and help develop new alloys.