Triggered by experimental observations of nanometer-sized Ni precipitate motion in a La₂O₃ matrix, the migration and morphological evolution by interface diffusion of an initially circular two-dimensional precipitate located near the free surface of its matrix is numerically investigated by means of phase-field simulations. Considering isotropic interface and elastic energies, it is found that the precipitate migrates towards the free surface, suitably adapting its shape during the motion. The case of two precipitates located near the free surface is also considered as well as the problem of an evolving precipitate near a squared corner of the matrix free surfaces.

Migration of a strained precipitate toward the matrix freesurface

通过在La ₂ O ₃基体中纳米尺寸的Ni沉淀物运动的实验观察结果，通过相的方式研究了位于其基体自由表面附近的初始圆形二维沉淀物的界面扩散引起的迁移和形态演变。场模拟。考虑到各向同性的界面和弹性能，发现沉淀物向自由表面迁移，从而在运动过程中适当地适应了其形状。还考虑了在自由表面附近存在两个沉淀物的情况，以及在基质自由表面的方形角附近析出沉淀物的问题。

应变沉淀物向基质自由表面迁移