The effects of deformation on the microstructure and the grain refinement performance of AlTi-C-B seed crystal alloys deformed by cold rolling were investigated.It is found that the coarse TiAl3 phases are broken and the TiCxBy particles in the matrix are more dispersive.The average grain size ofα-Al can be refined from 1 500μm to 240μm with adding 0.2%as-cast Al-5 Ti-0.3 C-0.2 Bseed crystal alloy.It is found that the grain size is further decreased to 165μm by adding the seed alloy with 60% deformation rate at the same addition and the good refinement performance can be stayed within 75 min without obvious fading.However

with the further increase of deformation to 90%

the grain refinement effect of the seed crystal alloy is decreased slightly

which is still better than that of the as-cast ones.