Kinetics of nonisothermal recrystallization

The kinetics of recrystallization from nonisothermal cycles is modeled using an extension of the Arrhenius relationship. This model is used to predict the annealing response for both isothermal and nonisothermal annealing cycles. A nondimensional parameter called the “annealing index” is based on time and temperature and is related to the extent of anneal through physical properties. The effect of heating and cooling rate also can be quantified because the entire thermal cycle is evaluated. Nonisothermal anneals with heating rates of 10 and 100 °C/s were evaluated (along with isothermal anneals) for colddrawn ETP copper wire. A numerical solution is set forth to evaluate nonisothermal cycles. Formerly Research Assistant, Rensselaer Polytechnic Institute, Troy, NY, USA.