Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 14    No. 5    October 2004

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Evaluation of mobile dislocation density based on distribution  function of dislocation segments
ZHOU Zhi-min(周志敏)1, SUN Yan-rui(孙艳蕊)1
ZHOU Hai-tao(周海涛)2

1. College of Science, Northeastern University, 
Shenyang 110004, China;
2. State Key Laboratory of Metal Matrix Composite, 
Shanghai Jiaotong University, Shanghai 200030, China

Abstract:A function is offered to represent the distribution of reduced length of dislocation segments. The segment distribution of materials, e.g., MgO and Cu, can be well described by taking appropriate values of parameters m and n. Based on this function, a model for evaluating the mobile dislocation density is developed. Provided the total dislocation density and applied stress are known, the mobile dislocation density could be readily assessed by using this model. For pure copper the mobile dislocation density and strain rates at deferent strains are evaluated. The calculated results are consistent with the known experimental data.


Key words: mobile dislocation; dislocation segment; distribution function

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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