| Evaluation of mobile dislocation density based on distribution function of dislocation segments |
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| 作者姓名： | 周志敏 孙艳蕊 周海涛 |
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| 作者单位： | [1]CollegeofScience,NortheasternUniversity,Shenyang110004,China [2]StateKeyLaboratoryofMetalMatrixComposite,ShanghaiJiaotongUniversity,Shanghai200030,China |
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| 基金项目： | the Foundation of Education Ministry for Returned Scholars，西北大学校科研和教改项目，中国博士后科学基金 |
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| 摘 要： | 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.
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| 关 键 词： | 位错密度 塑性材料 金属 晶体 MgO 氧化镁 铜 |
Evaluation of mobile dislocation density based on distribution function of dislocation segments |
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| ZHOU Zhi-min,SUN Yan-rui,ZHOU Hai-tao.Evaluation of mobile dislocation density based on distribution function of dislocation segments[J].Transactions of Nonferrous Metals Society of China,2004,14(5):977-980. |
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| Authors: | ZHOU Zhi-min SUN Yan-rui ZHOU Hai-tao |
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| Affiliation: | ZHOU Zhi-min~1,SUN Yan-rui~1,ZHOU Hai-tao~2 |
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| 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 parametersm 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. |
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| Keywords: | mobile dislocation dislocation segment distribution function |
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