Abstract
The critical minimum size of stable precipitate in the vicinity of the edge of miscibility gap is experimentally determined for Ni3Al precipitate particles in the Ni-Al and Cu4Ti particles in the Cu-Ti binary alloy systems using the macroscopic composition gradient method recently proposed. The results obtained are as follows: the critical nucleus size shows a rapid increase to several tens of nanometers in a very narrow composition region less than 0.3 at. pct from the phase boundary. Such a big critical size of the nucleus is statistically rationalized by the conventional nucleation theories, but remains kinetically unreasonable.
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