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周文权,黄世叶,王震,罗志荣,黄创高,高英俊.高温应变作用下小角度晶界湮没过程的晶体相场模拟[J].广西科学,2014,21(3):247-251. [点击复制]
- ZHOU Wen-quan,HUANG Shi-ye,WANG Zhen,LUO Zhi-rong,HUANG Chuang-gao,GAO Ying-jun.Phase Field Crystal Simulation of Annihilation Process of Small-grain Boundary under Stress at High Temperature[J].Guangxi Sciences,2014,21(3):247-251. [点击复制]
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| 高温应变作用下小角度晶界湮没过程的晶体相场模拟 |
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周文权1, 黄世叶1, 王震1, 罗志荣1,2, 黄创高1,2, 高英俊1,2
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| (1.广西大学物理科学与工程技术学院, 广西南宁 530004;2.广西大学广西有色金属及特色材料加工重点实验室, 广西南宁 530004) |
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| 摘要: |
| [目的]采用晶体相场模型模拟应变作用下晶界的变形过程。[方法]分别模拟了对称倾侧双晶体系在远离熔点温度和接近熔点温度时,在外加应力作用下小角度晶界的湮没过程。[结果]研究表明,小角度晶界同一侧晶界处相邻位错组的柏氏矢量夹角为60°,并且当体系接近熔点温度时,晶界处位错组周围出现预熔区域。[结论]晶界处的位错组在应力作用下进行滑移运动,两种情况中晶界位错的湮没规律基本相同,但由于预熔情况的出现,使得位错运动的阻力降低,位错运动的速度较快,湮没时体系能量减小得更多。 |
| 关键词: 晶体相场模型 晶界预熔 应变 湮没 |
| DOI：10.13656/j.cnki.gxkx.20140504.005 |
| 投稿时间：2013-10-10修订日期：2013-12-08 |
| 基金项目:国家自然科学基金(51161003,50661001,50061001),广西自然科学重点基金(2012GXNSFDA053001),广西大学广西有色金属及特色材料加工重点实验室开放基金(GXKFJ12-01)和2012年广西大学本科实验技能与科技创新能力训练项目资助。 |
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| Phase Field Crystal Simulation of Annihilation Process of Small-grain Boundary under Stress at High Temperature |
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ZHOU Wen-quan1, HUANG Shi-ye1, WANG Zhen1, LUO Zhi-rong1,2, HUANG Chuang-gao1,2, GAO Ying-jun1,2
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| (1.College of Physics Science and Engineering, Guangxi University, Nanning, Guangxi, 530004, China;2.Guangxi Key Laboratory for Non-ferrous Metal and Featured Materials, Nanning, Guangxi, 530004, China) |
| Abstract: |
| [Objective] Grain boundary (GB) deformation process under stress was modeled with the phase-field crystal approach.[Methods] We simulate the structure of symmetric tilt GB and its annihilation process under stress when the system temperature far from the melting point and close to the melting point, respectively.[Results] The Burgers vector of the two adjoining double-array dislocations along the small-angle GB has an angle about 60°, and a local premelting occurs around the dislocations as the premelting point is approached from below.[Conclusion] Dislocations of the GB begin to glide under stress, and the process of annihilation is similar in the two kinds of conditions.As premelting occurs, it diminishes the resistance and leads to a faster movement of the dislocations, and it also causes more energy reduction of the system during the process of annihilation. |
| Key words: phase field crystal model grain boundary premelting strain annihilation |
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