王守琰
,
宋诗哲
金属学报
将分形的概念应用于腐蚀形貌图像的特征提取, 计算扫描得到的实海腐蚀试片图像
的分形维数、广义维数、面积因子和空隙特征, 并作为分析诊断系统的输入. 用
模糊模式识别理论建立了基于图像分形特征的腐蚀形貌图像诊断系统, 可以由
图像的分形特征值判断金属的表面腐蚀形貌.
关键词:
腐蚀形貌
,
fractal
张人佶
,
王望弟
,
何大韧
金属学报
远离平衡生长的Cu/a-C∶H双层膜具有网络分形的结构。在本实验条件下,测量出它的分维数D_f≈1.83。在TEM中对该双层膜进行缓慢加热的原位动态观察,发现原有的网络结构在535℃时完全遭到破坏,同时随着Cu膜的退火缩聚,逐渐出现随机分布的缩聚区,此区的分维值随着退火温度的上升而下降,最后在850℃时变为D_f=1.63。利用金属原子的表面与界面扩散模型,可以解释这种结构特征的变化。
关键词:
Cu膜
,
fractal
,
annealing-induced aggregation
李功伯
,
徐小荷
金属学报
用半自动图象分析系统测定了矿岩粉碎后颗粒的周边分形结构,得到粉碎后颗粒表面的分维数在2.033—2.110范围,其分维数随粒度减小而有所增大。按粉碎能耗增量正比?颗粒分形结构的表面积增量原理,得到和Hukki粉碎能耗表达式相同的结果,后者是概括了Rittinger,Kick和Bond三大粉碎能耗学说的共同表达式。
关键词:
矿岩颗粒
,
energy in comminution
,
fractal
K. S. Guan
,
L. Zhang
,
Y. G. Yao and M. H. Zhang 1) Research Insititute of Chemical Equipment
,
East China University of Science and Technology
,
Shanghai 200237
,
China 2) Department of Information and Control
,
Weihai Branch School
,
Harbin University of Technology
,
Weihai 264209
,
China 3) Laiyang Agricultural College
,
Laiyang 265200
,
China
金属学报(英文版)
Electroless NiP coating has stochastic nonlinear structure, which was in far from equilibrium and instability state. Fractal theory, an effective method for resolving nonlinear system, was introduced to describe the coating structure quantitatively. Disorker and self-similarity characteristics, which are the two basic features of fractal, were explained in this paper for the first time. The results show that amorphous NiP structure exhibits scale invariance and can be quantitatively characterized by fractal dimension. Based on the fractal principle, a two-dimensional computer simulation on electroless NiP deposition was carried out and it is in agreement with the experimental result. Finally, the fractal dynamics and process of atom growth were investigated. The results show that the atom deposition is reaction-limited growth process.
关键词:
fractal
,
null
,
null
Y.H. Xia 1)
,
T.P. Lou 1)
,
Z.T. Sui 1) and B. Li 2) 1) School of Material & Metallurgy
,
Northeastern University
,
Shenyang 110006
,
China 2) Jiamusi University
,
Jiamusi 154007
,
China
金属学报(英文版)
The fractal and spinodal decomposition models combined Monte Carlo method were used in computer simulation of phase separation from CaO MgO Fe 2O 3 Al 2O 3 SiO 2 glass. The fractal dimension was applied to quantitative analysis. The mechanism of phase separation was investigated. The results showed that the fractal dimensions and simulated micrographs of phase separation were in good agreement with the experimental results. And the mechanism of phase separation was spinodal decomposition.
关键词:
glass
,
null
,
null
,
null
,
null
,
null
,
null
J.Q. Zhang
金属学报(英文版)
Spontaneous electrochemical noise (EN) can be a rich source of information concerning the processes simultaneously occurring on a corroding interface. But the noise signal is often difficult to be analyzed due to the complicated nature of the specific systems being investigated. In this paper, the potential noise fluctuations during the free corrosion of commercial aluminum alloy LY12 in sodium chloride solution was recorded and analyzed with different techniques. The typical results showed that the fractal dimension (D,n) obtained from spectral power density (SPD) is mainly directly proportional to the intensity of pitting corrosion and to the value of pitting parameter (SE) derived from dimensional analysis, while the fractal dimension (DE) obtained from EIS is mainly related to the uniform corrosion.
关键词:
electrochemical noise
,
null
,
null
,
null
,
null
