Static recrystallisation in an ODS FeAl alloy: The effect of particles on texture and anisotropic grain growth developments

Microstructure modifications associated with static recrystallisation in an Oxide Dispersion Strengthened alloy are investigated by using both experimental (Electron Back-scattered and X-ray Diffraction techniques) and simulation (Monte Carlo) approaches. The morphology of the grains issued from static recrystallisation is influenced significantly by the alignment of the oxide particles in the as-extruded starting material. Monte Carlo simulation is introduced to study the effect of particle distribution, particle alignment, initial grain size and shape on the morphological anisotropy developed in the recrystallised microstructure. Simulation results show significant correlation between grain shape anisotropy and particle availability in the alignment direction. The initial grain size criterion is associated with the separation length between aligned particles to obtain an efficient pinning effect. Grain shape anisotropy can be preserved if an efficient Zener pressure is coupled to an anisotropic grain growth.