The effect of nonequilibrium defect relaxation on phase transformation parameters in solids

Abstract

Phase transformation thermodynamics in solids containing an excess (nonequilibrium) number of lattice defects is considered. It is shown that under definite conditions (fast heating, pressure increase) the defect relaxation leads to the decrease of thermodynamic parameters (temperature, pressure) in the instant of phase transformation.

Disorder–order phase transformation in sputter deposited Pd3In thin films

“…The defects have a significant effect on the kinetics of phase transformation by providing diffusion short circuits and/or nucleation sites. It was reported that during fast heating, the defect relaxation could lead to a decrease in temperature in the instant of phase transformation [14]. Similar results were reported in NiTi alloys [15]; the temperature for martensite to austenite transformation in the 40% cold rolled and then annealed at 778 K for 1 min was about 30-40 • C lower than that in the as-annealed sample (2 h at 1143 K).…”