FRACTAL DISLOCATION PATTERNING DURING PLASTIC DEFORMATION
FRACTAL DISLOCATION PATTERNING DURING PLASTIC DEFORMATION
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DOI：
10.1103/physrevlett.81.2470
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发表时间：
1998-09
影响因子：
8.6
通讯作者：
P. Hähner;K. Bay;M. Zaiser
中科院分区：
文献类型：
--
作者：
P. Hähner;K. Bay;M. Zaiser
在塑性变形的后期阶段，面心立方金属的应变硬化伴随着各种尺度上出现的细胞位错图案的形成。本文对这些位错结构的分形几何进行了分析。提出了一个理论模型，根据该模型，位错单元的形成与噪声引起的远离平衡的结构转变相关。观察到的分形维数与位错滑移的随机过程有关，并讨论了对定量金相学的影响。
During the later stages of plastic deformation, strain hardening of face-centered cubic metals goes along with the formation of cellular dislocation patterns appearing on various scales. The paper presents an analysis of the fractal geometry of these dislocation structures. A theoretical model is presented according to which dislocation cell formation is associated with a noise-induced structural transition far from equilibrium. The observed fractal dimensions are related to the stochastic process of dislocation glide, and implications for quantitative metallography are discussed.