Fractal structure and fractal dimension determination at nanometer scale |
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Authors: | Yue Zhang Qikai Li Wuyang Chu Chen Wang Chunli Bai |
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Institution: | (1) Department of Materials Physics, University of Science and Technology Beijing, 100083 Beijing, China;(2) Institute of Chemistry, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | Three-dimensional fractures of different fractal dimensions have been constructed with successive random addition algorithm,
the applicability of various dimension determination methods at nanometer scale has been studied. As to the metallic fractures,
owing to the limited number of slit islands in a slit plane or limited datum number at nanometer scale, it is difficult to
use the area-perimeter method or power spectrum method to determine the fractal dimension. Simulation indicates that box-counting
method can be used to determine the fractal dimension at nanometer scale. The dimensions of fractures of valve steel 5Cr21Mn9Ni4N
have been determined with STM. Results confirmed that fractal dimension varies with direction at nanometer scale. Our study
revealed that, as to theoretical profiles, the dependence of frsctal dimension with direction is simply owing to the limited
data set number, i.e. the effect of boundaries. However, the dependence of fractal dimension with direction at nanometer scale
in real metallic fractures is correlated to the intrinsic characteristics of the materials in addition to the effect of boundaries.
The relationship of fractal dimensions with the mechanical properties of materials at macrometer scale also exists at nanometer
scale.
Project supported by the National Natural Science Foundation of China (Grant Nos. 59771050 and 59872004) and the Foundation
Fund of Ministry of Metallurgical Industry. |
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Keywords: | fractures nanometer scale fractal dimension simulation |
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