Metallurgical and Materials Transactions A

, Volume 39, Issue 5, pp 976–983 | Cite as

Finding Critical Nucleus in Solid-State Transformations

Symposium: Solid-State Nucleation and Critical Nuclei during First Order Diffusional Phase Transformations

Abstract

Based on the phase-field total free energy functional and free-end nudged elastic band (NEB) algorithm, a new methodology is developed for finding the saddle-point nucleus in solid-state transformations. Using cubic → tetragonal transformations in both two and three dimensions as examples, we show that the activation energy and critical nucleus configuration along the minimum energy path (MEP) can be determined accurately and efficiently using this new approach. When the elastic energy contribution is dominant, the nucleation process is found to be collective with the critical nucleus consisting of two twin-related variants. When the elastic energy contribution is relatively weak, the critical nucleus consists of a single variant, and the polytwinned structure develops during growth through a stress-induced autocatalytic process. A nontrivial two-variant critical nucleus configuration is observed at an intermediate level of the elastic energy contribution. This general method is applicable to any thermally activated process in anisotropic media, including nucleation of stacking faults and dislocation loops, voids and microcracks, and ferroelectric and ferromagnetic domains. It is able to treat nucleation events involving simultaneously displacive and diffusional components, and heterogeneous nucleation near pre-existing lattice defects.

Notes

Acknowledgments

We acknowledge support by the AFOSR MEANSII (Grant No. FA9550-05-1-0135) and ONR D3D (Grant No. N00014-05-1-0504) programs and the Ohio Supercomputer Center. The work of JL is also supported by Grant No. NSF DMR-0502711.

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Copyright information

© THE MINERALS, METALS & MATERIALS SOCIETY and ASM INTERNATIONAL 2007

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringThe Ohio State UniversityColumbusUSA

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