Nucleation and growth in Al-Zn: A test of the Langer-Schwartz model

Small-angle x-ray scattering has been used to monitor the decrease in supersaturation with time in Al-Zn alloys following quenches into the metastable miscibility gap. The results demonstrate that the Langer-Schwartz model of nucleation and growth is accurate provided a time-dependent nucleation rate is included.