Why recrystallization temperature decreases with the increas

Solution

Larger deformation Lower recrystallization temperature

The recrystallization temperature will decrease with increasing deformation because the characteristic deformation affects the critical temperature of the material which tends to increase the magnitude prior deformation, or reducing the deformation temperature. Which ultimately increase the stored energy and the number of potential nuclei. Greater amount of cold work makes the metal less stable and encourage nucleation. There is a minimum amount of cold work, about 20% to 30%, below which recrystallization will not occur. Increasing the annealing time reduces the recrystallization temperature.

Basically pure metals recrystallize at lower temperatures than alloys. A smaller cold worked grain size reduces the recrystallization temperature. Higher melting point alloys have a higher recrystallization temperature. . In keeping with commonly observed behavior, increasing amounts of cold work lead to an increase in hardness prior to annealing and a decrease in the subsequent recrystallization temperature and grain size. Also, there occurred for the recrystallized grains a decrease in the standard deviation of the grain volume distribution.

Since recrystallization is a diffusion controlled process, the recrystallization temperature can estimated roughly to be ~ 0.4 Tm. The recrystallization temperature decreases with increasing impurity of motel. Alloying always raise recrystallization temperature.