Perez Danny, Lewis Laurent J
Département de Physique et Regroupement Québécois sur les Matériaux de Pointe (RQMP), Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal (Québec), Canada H3C 3J7.
Phys Rev Lett. 2007 Feb 16;98(7):075501. doi: 10.1103/PhysRevLett.98.075501. Epub 2007 Feb 12.
With a view of finding a route toward microstructural stability in alloys, we numerically study the impact of elastic inhomogeneities on the growth of inclusions in multiphase systems. We show that growth can proceed either continuously at rough interfaces, or in a layer-by-layer fashion following an elastically induced kinetic faceting process. In the former case, the chemical potential of the inclusions is a smooth function of size, while in the latter case, elasticity increases the barrier for nucleation of new terraces on the facets, leading to an oscillatory behavior of the chemical potential and hence a strong resistance against coarsening, opening up the possibility to stabilize the structure.
为了找到实现合金微观结构稳定性的途径，我们对弹性不均匀性对多相系统中夹杂物生长的影响进行了数值研究。我们表明，生长可以在粗糙界面处连续进行，或者通过弹性诱导的动力学刻面过程以逐层方式进行。在前一种情况下，夹杂物的化学势是尺寸的平滑函数，而在后一种情况下，弹性增加了在小平面上新台阶成核的势垒，导致化学势的振荡行为，从而产生对粗化的强抗性，为稳定结构开辟了可能性。
