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邓芊芊,胡绪志,黄礼琳,罗志荣,高英俊.条状晶位错运动的晶体相场模拟[J].广西科学院学报,2017,33(4):223-227. [点击复制]
- DENG Qianqian,HU Xuzhi,HUANG Lilin,LUO Zhirong,GAO Yingjun.Phase field crystal Study on Dislocations Movement in Strip Grain[J].Journal of Guangxi Academy of Sciences,2017,33(4):223-227. [点击复制]
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| 条状晶位错运动的晶体相场模拟 |
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邓芊芊1, 胡绪志1, 黄礼琳1,2, 罗志荣2, 高英俊1
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| (1.广西大学物理科学与工程技术学院, 广西高校新能源重点实验室, 广西南宁 530004;2.玉林师范学院物理科学与工程技术系, 广西玉林 537000) |
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| 摘要: |
| [目的]研究条状晶内不同矢量位错相互作用的情况,以揭示其运动和能量变化规律。[方法]采用晶体相场(PFC)模型,模拟4块取向差较小的条状晶所形成的4条亚晶界在应力作用下的湮没机制,并从位错运动和能量变化角度分析该机制。4条亚晶界中,2条是对称倾侧亚晶界,2条为非对称倾侧亚晶界结构。[结果]取向差较小的条状晶所形成的晶界为亚晶界,亚晶界上双位错组的数量由相邻两晶粒的取向差的大小决定;而在应力作用下,亚晶界的湮没过程主要有3个阶段:位错攀移及体系能量升高的第1阶段,位错分离及体系能量下降的第2阶段,位错相互作用及体系能量波动升高的第3阶段;由于存在非对称倾侧亚晶界,整个湮没过程比对称倾侧亚晶界的湮没过程较复杂一些。[结论]位错的相互作用存在4种情况:两位错相向运动,当位错矢量方向完全相反且在同一直线上时,相遇后发生湮没;位错相向运动,但运动方向不在一条直线上且距离较近,则可以相互吸引,最后依然可以湮没;如果运动方向不在一条直线上且距离较远,则无法相互吸引,它们只会朝着各自的运动方向继续运动;如果运动方向在一条直线上,但是位错方向不完全相同,它们相遇后不会湮没,而是组合形成一个复合位错。 |
| 关键词: 晶体相场模型 亚晶界 位错 相互作用 |
| DOI：10.13657/j.cnki.gxkxyxb.20171129.002 |
| 投稿时间：2017-07-10 |
| 基金项目:国家自然科学基金项目(51161003,51561031),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 Study on Dislocations Movement in Strip Grain |
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DENG Qianqian1, HU Xuzhi1, HUANG Lilin1,2, LUO Zhirong2, GAO Yingjun1
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| (1.Guangxi Key Laboratory of Novel Energy Materials of College and University, College of Physics Science and Engineering, Guangxi University, Nanning, Guangxi, 530004, China;2.Institute of Physics Science and Engineering Technology, Yulin Normal University, Yulin, Guangxi, 537000, China) |
| Abstract: |
| [Objective] In this paper,the interaction between dislocations with different vectors in the strip crystal is studied to reveal the regularity of its movement and energy.[Methods] The phase field crystal (PFC) model is used to simulate the annihilation mechanism of 4 sub-grain boundaries (SGBs) formed by 4 strip grains with smaller orientation under stress.The annihilation mechanism is analyzed from the perspective of dislocation movement and energy change.In these 4 sub-grain boundaries,two of them are symmetrical tilt SGBs and the other two are asymmetric tilt SGBs.[Results] Studies show that the grain boundary formed by the strip grains with smaller orientations is SGB.The number of double dislocation groups in the SGB is determined by the orientation of the two adjacent grains.Under the stress,the annihilation process of SGBs is mainly composed of 4 stages:The first stage of dislocations climbing and system energy arising,the second stage of dislocations separation and system energy decrease,the third stage of dislocations interaction and system energy fluctuation increase.Due to the existence of asymmetric tilt SGB,the whole annihilation process is more complicated than that of the symmetric tilt SGB.[Conclusion] There are three cases of dislocation interaction:Two dislocations move forward; if these dislocations have opposite vectors at the same line,they will annihilate; if these dislocations are not at the same line their distance is closer,they can attract each other and then annihilate; if these dislocations are not at the same line their distance is relatively far,they cannot be attracted to each other but just keep moving in the direction of their movement; if the direction of movement is in a straight line,but the direction of dislocation is not exactly the same,when they meet,they do not annihilate,but combine to form a compound dislocation. |
| Key words: phase field crystal model sub-grain boundary dislocation interaction |
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