An investigation of dynamic recrystallisation on Cu-Sn bronze using 3D EBSD

A focused ion beam and electron backscatter diffraction were used to investigate the three-dimensional microstructure of small dynamically recrystallised grains in a deformed Cu-Sn alloy and to determine their orientation relationships. It was found that many of the grains, which form as thin sheets at the prior boundaries, are twin related. It is concluded that dynamical recrystallisation usually starts in regions where plastic deformation has resulted in significant lattice rotations beside the grain boundaries. Once such a new grain has formed, dynamic recrystallisation is propagated by successive twinning from the new grain, along the prior grain boundary, resulting in families of several hundred twin related dynamically recrystallised grains.