Temperature induced smoothing of initially fractal grain boundaries
Temperature induced smoothing of initially fractal grain boundaries
复制标题
温度诱导的初始分形晶界平滑化
DOI：
10.1016/1359-6462(95)00477-7
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
P. Veit
中科院分区：
文献类型：
--
作者：
P. Streitenberger;D. Förster;G. Kolbe;P. Veit
近年来，锯齿状或凹凸不平的晶界对合金力学性能的影响以及利用分形几何概念对这种几何不规则微观结构进行数值表征引起了人们的广泛关注。据报道，锯齿状或崎岖的晶界的产生，例如，通过冷加工或热处理，是提高合金高温强度，特别是蠕变断裂性能的最有效方法之一。在本文中，首次提出了退火后初始分形晶界粗糙度变化的测量。实验结果在自相似界面的粗化模型的基础上进行了讨论，该模型预测了晶界的平滑动力学对其初始分形维数的依赖性。
Recently the effect of serrated or rugged grain boundaries on the mechanical properties of alloys and the numerical characterization of such a geometrically irregular microstructure by means of the concept of fractal geometry has attracted great attention. It has been reported that the generation of serrated or rugged grain boundaries, e.g. by cold work or heat treatment, is one of the most effective methods to improve the high-temperature strength of alloys, especially the creep rupture properties. In the present paper, for the first time, measurements of the change in the roughness of initially fractal grain boundaries after annealing are presented. The experimental results are discussed on the basis of a coarsening model for self-similar interfaces, which predicts a dependency of the smoothing kinetics of the grain boundaries on their initially fractal dimension.