Recrystallization mechanism of grain refinement in hypercooled single phase alloys

Hypercooling was achieved in both Co₈₀Pd₂₀ alloys and Ni₈₀Pd₂₀ alloys by applying the fluxing method. Microstructures and substructures of the as-solidified hypercooled Co ₈₀Pd₂₀ alloys and Ni₈₀Pd₂₀ alloys were investigated. High densities of low-angle grain boundaries, dislocations networks were observed in the as-solidified hypercooled specimens. These substructures suggest a partial recrystallization occurring in the as-solidified specimens. After recrystallization annealing, the coarse grained microstructures of the quenched alloy refined. These results are believed as the evidences of recrystallization mechanism of grain refinement in these highly undercooled single phase alloys.