The recrystallisation behavior under different strain distributions (achieved through forging or extrusion) and with different thermal histories, in large Ti-64 ingot and in powder HIPped Ti-64 is to be investigated, for the purpose of understanding the cause of heterogeneities in the processed microstructures of forged Ti alloys, and defining an appropriate processing window for the alloy which will ensure a homogeneous microstructure in forged large Ti structural components. Furthermore, the knowhow to achieve powder HIPped Ti-64 material of fatigue properties equivalent to those attainable from forged ingots will also be developed.