Abstract
Abstract Long-range ordering and disordering in nearly stoichiometric CuAu (49.4 at% Cu, 50.5 at% Au) has been investigated by dynamic in situ resistometry. Linear cooling and linear heating, starting from constant initial conditions, was performed at different rates of temperature change. For cooling runs the usual effect of undercooling was found, increasing with increasing cooling rate. For heating runs, however, a shift of the transformation temperature to lower temperatures with increasing heating rate was observed. This is similar to what has been previously reported for cyclic measurements ( retro-effect ). This effect is not influenced by isothermal annealing at 300 °C; it is probably connected with the nucleation stage of the phase transformation and thereby with the microstructure of the material.
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