Peritectic reaction temperatures of Al-Ni alloys and Sn-Sb alloys were measured by DSC. With a given cooling rate

peritectic reaction temperature of Al-Ni alloys is serious delayed

while that of Sn-Sb alloys is nearly equal with equilibrium reaction temperatures

which is closely related to the structural difference of primary phase and peritectic phase. With different structure between primary phase and peritectic phase

peritectic reaction is seriously delayed

while with the same structure

the reactive temperature is identical with equilibrium temperature.