Morphology of critical nuclei in solid-state phase transformations.
Predicting the shape of a critical nucleus in solids has been a long-standing problem in solid-state phase transformations. We show that a diffuse-interface approach together with a minimax algorithm is able to predict the critical nucleus morphology in elastically anisotropic solids without a priori assumptions. We demonstrate the possibility of nonconvex surfaces for critical nuclei. It is found that strong elastic energy contributions may lead to critical nuclei whose point group symmetry is below the crystalline symmetries of both the new and the parent phases.
Department of Mathematics, Penn State University, Pennsylvania 16802, USA. zhang_l@math.psu.edu
Lei
L
Zhang
Long-Qing
LQ
Chen
Qiang
Q
Du