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Two-step nucleation mechanism in solid–solid phase transitions

Abstract

The microscopic kinetics of ubiquitous solid–solid phase transitions remain poorly understood. Here, by using single-particle-resolution video microscopy of colloidal films of diameter-tunable microspheres, we show that transitions between square and triangular lattices occur via a two-step diffusive nucleation pathway involving liquid nuclei. The nucleation pathway is favoured over the direct one-step nucleation because the energy of the solid/liquid interface is lower than that between solid phases. We also observed that nucleation precursors are particle-swapping loops rather than newly generated structural defects, and that coherent and incoherent facets of the evolving nuclei exhibit different energies and growth rates that can markedly alter the nucleation kinetics. Our findings suggest that an intermediate liquid should exist in the nucleation processes of solid–solid transitions of most metals and alloys, and provide guidance for better control of the kinetics of the transition and for future refinements of solid–solid transition theory.

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Figure 1: 5 two-step nucleation in a crystal with two vacancies in an H = 3 μm sample at 27.2 °C.
Figure 2: 5 two-step nucleation in a crystal with dislocations at 27.4 °C.
Figure 3: 5 two-step nucleation at a grain boundary at 27.2 °C.
Figure 4: Two-step nucleation mechanism.
Figure 5: Properties of nuclei.

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Acknowledgements

This work was supported by Chinese grants NSFC11374248 (Y.H.), NSFC11004143, NSFC21174101, NSFC91027040 and NBRPC.2012CB821500 (Z.Z.), and by US grants NSF DMR12-05463, NSF-MRSEC DMR11-20901 and NASA NNX08AO0G (A.G.Y.).

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Contributions

Y.P. and Y.H. conceived and designed the research plan. Y.P. carried out the experiment and data analysis with help from Z.W. F.W., Y.P. and Y.H. carried out the theoretical modelling. A.M.A. and Z.Z. synthesized the particles. Y.H., Y.P. and A.G.Y. wrote the paper. Y.H. and A.G.Y. supervised and supported the work. All authors discussed the results.

Corresponding author

Correspondence to Yilong Han.

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The authors declare no competing financial interests.

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Peng, Y., Wang, F., Wang, Z. et al. Two-step nucleation mechanism in solid–solid phase transitions. Nature Mater 14, 101–108 (2015). https://doi.org/10.1038/nmat4083

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