| 工程合金中空位—溶质原子复合体扩散与非平衡偏聚 |
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| 引用本文： | 钱云鹏,何庆复,阎国臣,高义刚.工程合金中空位—溶质原子复合体扩散与非平衡偏聚[J].北京交通大学学报(自然科学版),2001,25(1):84-87. |
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| 作者姓名： | 钱云鹏 何庆复 阎国臣 高义刚 |
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| 作者单位： | 北方交通大学机械学院!北京100044 |
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| 摘 要： | 通常固体中的扩散被认为是单原子扩散问题 ,并形成完善的平衡偏聚理论 .非平衡偏聚过程是伴随着空位在晶界的湮灭过程发生的 .晶界上可同时存在平衡偏聚与非平衡偏聚 ,存在一个偏聚转折温度 ,在此温度以上 ,非平衡偏聚起主导作用 ,此温度区以下 ,平衡偏聚为主导 .复合体扩散机制可以圆满的解释非平衡偏聚现象 .
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| 关 键 词： | 空位 复合体 扩散 非平衡偏聚 |
| 文章编号： | 1000-1506(2001)01-0084-04 |
| 修稿时间： | 2000年4月11日 |
Vacancy-Solute Atom Complexes Diffusion and Non-Equilibrium Segregation in Alloy Steels |
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| QIAN Yun peng,HE Qing fu,YAN Guo chen,GAO Yi gang.Vacancy-Solute Atom Complexes Diffusion and Non-Equilibrium Segregation in Alloy Steels[J].JOURNAL OF BEIJING JIAOTONG UNIVERSITY,2001,25(1):84-87. |
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| Authors: | QIAN Yun peng HE Qing fu YAN Guo chen GAO Yi gang |
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| Abstract: | Diffusion in solides has been interpreted by mature theory of Equilibrium Segregation which is based on single atom diffusion. Non Equilibrium Segregation takes place with the vacancies annihilating in grain boundaries. Equilibrium Segregation and Non Equilibrium Segregation can coexist at grain boundaries, and there is a segregation transition tempreture. Above the tempreture, Non Euilibrium Segregation plays the predominant role and below the tempreture Equilibrium Segregation plays the predominant role. On the base of vacancy solute atom complexes diffusion, Non Equilibrium Segregation can be satisfactorily interpreted. |
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| Keywords: | vacancy complexes diffusion Non Equilibrium Segregation |
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