| 引用本文： |
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杨瑞琳,刘瑶,胡绪志,卢强华,高英俊.双位错滑移运动的晶体相场模拟[J].广西科学,2016,23(5):443-447. [点击复制]
- YANG Ruilin,LIU Yao,HU Xuzhi,LU Qianghua,GAO Yingjun.Phase-field-crystal Simulation of Double Dislocation Gliding[J].Guangxi Sciences,2016,23(5):443-447. [点击复制]
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| 摘要: |
| [目的]研究晶体位错运动对材料加工力学性能的影响。[方法]应用改进晶体相场(Phase-field-crystal,PFC)模型,研究剪切应变作用下晶体的双位错的滑移运动特征。[结果]在应变作用下,体系的双位错只作滑移运动,运动方向平行且相反,保持匀速运动,不出现攀移运动;应变率较小时,位错作滑移运动,越过势垒需要一定孕育时间,此时滑移出现颠簸式运动特征;应变率较大时,位错滑移运动呈匀速直线运动。[结论]PFC模型能较好地用于研究位错在应变作用下的运动。 |
| 关键词: 晶体位错 滑移 应变 晶体相场 |
| DOI：10.13656/j.cnki.gxkx.20161121.015 |
| 投稿时间：2016-07-25修订日期：2016-08-02 |
| 基金项目:国家自然科学基金项目(51161003),广西自然科学基金重点项目(2012GXNSFDA053001)和广西大学大创项目(201610593220,201610593218)资助。 |
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| Phase-field-crystal Simulation of Double Dislocation Gliding |
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YANG Ruilin, LIU Yao, HU Xuzhi, LU Qianghua, GAO Yingjun
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| (College of Physical Science and Technology, Guangxi University, Nanning, Guangxi, 530004, China) |
| Abstract: |
| [Objective] The effects of crystal dislocation movement on mechanical behaviors of materials processing are studied.[Methods] The feature of the gliding of double dislocation under shear strain are simulated by the improved phase-field-crystal(PFC).[Results] The simulation results show that the double dislocation of the system only glides without climbing under stress,and keeps moving at a constant speed,while their directions are parallel,but opposite.When the strain rate is small,it requires a certain incubation time to overcome the barrier,therefore,the slipping of dislocation looks like a bumpy way.When the strain rate is larger,the dislocation glides uniformly in a straight line,while the strain rate is relatively smaller,the gliding is of the bumpy motion.[Conclusion] PFC model can be well used to study the dislocation movement under the effect of strain. |
| Key words: crystal dislocation gliding strain phase-field-crystal |
