论文标题
对流诱导的合金晶界处的成分图案
Convection-induced compositional patterning at grain boundaries in irradiated alloys
论文作者
论文摘要
我们考虑通过受辐射的稀合金中的辐射诱导的隔离在晶界（GB）形成的沉淀物的稳定性。使用相位场建模量化了晶粒尺寸和对称倾斜GB的不当作用。确定了一种新颖的状态，长期以来，GB会通过抵抗粗化的沉淀模式装饰。扩散péclet数的地图表明，当溶质对流占主导地位以直至沉淀/基质界面，压倒性毛细血管效应的热扩散占主导地位时，发生了滞留的粗化。这与对流只会加速变厚的液固液混合物形成对比。
We consider the stability of precipitates formed at grain boundaries (GBs) by radiation-induced segregation in dilute alloys subjected to irradiation. The effects of grain size and misorientation of symmetric-tilt GBs are quantified using phase field modeling. A novel regime is identified where, at long times, GBs are decorated by precipitate patterns that resist coarsening. Maps of the diffusional Péclet number indicate that arrested coarsening takes place when solute advection dominates over thermal diffusion right up to the precipitate/matrix interface, overwhelming capillary effects. This contrasts with liquid-solid mixtures where convection only accelerates coarsening.
