| 引用本文： |
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黄世叶,李胜男,胡绪志,孔令一,卢强华,高英俊.晶界位错运动的空位晶体相场模拟[J].广西科学,2016,23(5):459-464. [点击复制]
- HUANG Shiye,LI Shengnan,HU Xuzhi,KONG Lingyi,LU Qianghua,GAO Yingjun.Vacancy Phase-field-crystal Simulation of Dislocation Motion of Grain Boundary[J].Guangxi Sciences,2016,23(5):459-464. [点击复制]
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| 摘要: |
| [目的]研究不同形式的应力对位错运动形式的影响。[方法]通过添加空位自由能项修正晶体相场模型(Phase-field-crystal model,PFC model),得到空位晶体相场法模型(Vacancy phase-field-crystal model,VPFC model),并采用VPFC模拟小角度晶界(Grain Boundary)在外加单方向应力作用下的变形过程。[结果]在外加单方向应力作用下,小角度晶界位错组作攀移运动时系统自由能增加,位错组滑移时出现系统自由能下降和位错反应等现象。x方向拉应力促使位错发生负攀移,压应力促使位错发生正攀移。[结论]VPFC模型可有效模拟晶界位错、空位等微结构演化过程。 |
| 关键词: 晶体相场 位错 应变 晶界 |
| DOI：10.13656/j.cnki.gxkx.20161121.002 |
| 投稿时间：2016-08-17 |
| 基金项目:国家自然科学基金项目(51161003,50661001),广西自然科学基金重点项目(2012GXNSFDA053001),广西大学大创项目(201610593220,201610593218)资助。 |
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| Vacancy Phase-field-crystal Simulation of Dislocation Motion of Grain Boundary |
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HUANG Shiye, LI Shengnan, HU Xuzhi, KONG Lingyi, LU Qianghua, GAO Yingjun
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| (School of Physical Science and Technology, Guangxi University, Nanning, Guangxi, 530004, China) |
| Abstract: |
| [Objective] The influence of different forms of stress on dislocation movement was studied.[Methods] By adding a vacancy free energy term,we obtained a new model of vacancy phase-field-crystal (VPFC),which was used to simulate the deformation process of low-angle grain boundaries(GBs) under a single direction stress.[Results] The simulation results show that the free energy of system increases when dislocations climb on GBs whereas the free energy decreases when dislocations glide with the appearance of dislocations reaction.The tensile stress of x direction prompts dislocations to negative climbing,and compressive stress on the contrary.[Conclusion] The VPFC model can effectively simulate the microstructure evolution process of grain boundary dislocations and vacancies. |
| Key words: phase-field-crystal dislocation strain grain boundary |
