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金属学报  2019, Vol. 55 Issue (2): 274-280    DOI: 10.11900/0412.1961.2018.00190
  本期目录 | 过刊浏览 |
王瑾, 余黎明, 李冲, 黄远, 李会军, 刘永长()
天津大学材料科学与工程学院水利安全与仿真国家重点实验室 天津 300354
Effect of Different Temperatures on He Atoms Behavior inα-Fe with and without Dislocations
Jin WANG, Liming YU, Chong LI, Yuan HUANG, Huijun LI, Yongchang LIU()
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering,Tianjin University, Tianjin 300354, China
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采用分子动力学模拟了不同温度下0.1%He (原子分数)浓度下含与不含位错α-Fe中He原子偏聚行为和拉伸变形行为。结果表明,当温度为300 K时,预置的位错影响较弱,含与不含位错α-Fe模型中He原子均容易发生自吞噬形成He团簇,He团簇分布弥散且尺寸较小,位错环数目较少;当温度为600 K时,He原子热扩散行为加剧,较多的He原子偏聚到位错,He团簇分布离散且尺寸较大,位错环数目增加。在拉伸变形过程中,位错的存在能够加速He团簇演变成He泡,降低了模型的屈服应力和应变。在低温300 K时,弥散分布的小He团簇容易合并,发生脆性断裂,整个变形过程位错密度较低;在高温600 K时,离散分布的大He泡展现出较好的延展性,发生塑性断裂,整个变形过程中位错大量增殖,塑性较好。

关键词 α-Fe;位错温度He分子动力学    

The requirement of meeting rapidly growing demand for energy while maintaining environmentally friendly has been motivating the hot research on thermonuclear fusion. One of the key issues in future fusion reactors is that structural materials, especially fusion device first wall material, will suffer from He cumulative effects and atomic displacements from radiation cascades. Such harsh service conditions lead to the formation of He bubbles, which are responsible for severe degradation of the structural materials (e.g., swelling, embrittlement, loss of ductility etc.). It is thus essential to further understand the formation of He bubbles and hardening characteristics for the development of future nuclear materials. In this work, the behaviors of He segregation and tensile deformation have been investigated by molecular dynamics (MD) simulations in α-Fe with and without dislocations (dislocation densities are 0 and 3.36×1011 cm-2, respectively ) and at the annealing temperatures of 300 and 600 K with 0.1%He (atomic fraction) injection. The results show that during the process of 300 K annealing, the effect of dislocation is rather weak, and He atoms are easier to form small He clusters by self-trapping. The size of He clusters and the number of dislocation loops are lower. Furthermore, higher temperature can notably intensify He diffusion, and the size of He clusters and the number of dislocation loops both increase at 600 K. In the process of tensile deformation, dislocations can notably accelerate small He clusters to develop into larger He bubbles, which leads to lower yield stress and strain. In addition, at 300 K, the model mainly occurs to brittle fracture and the dislocations density is lower. At 600 K, larger He bubble can promote dislocation multiply and enhance the deformability. Therefore, there exhibits a better plasticity in the model.

Key wordsα-Fe;    dislocation    temperature    He    molecular dynamics
收稿日期: 2018-05-14     
ZTFLH:  TG111.91  
基金资助:资助项目 国家自然科学基金项目Nos.51474156、U1660201和国家磁约束核聚变能源研究专项课题No.2015GB119001

作者简介 王 瑾,女,1989年生,博士


王瑾, 余黎明, 李冲, 黄远, 李会军, 刘永长. 不同温度对含与不含位错α-Fe中He原子行为的影响[J]. 金属学报, 2019, 55(2): 274-280.
Jin WANG, Liming YU, Chong LI, Yuan HUANG, Huijun LI, Yongchang LIU. Effect of Different Temperatures on He Atoms Behavior inα-Fe with and without Dislocations. Acta Metall Sin, 2019, 55(2): 274-280.

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图1  A模型与B模型局部断面视图
Model x / nm y / nm z / nm Number of dislocations Number of atoms
A 19.8 32.4 4.65 0 256000
B 19.8 32.4 4.65 2 255720
表1  A和B模型的几何尺寸
图2  300 K下A和B模型中He原子偏聚平衡构型图和He团簇尺寸分布条形图
图3  300 K下2种模型的应力-应变曲线和位错密度-应变曲线
图4  300 K下2种模型随应变增加的构型演变图
图5  600 K下A和B模型中He原子偏聚平衡构型图和He团簇尺寸分布条形图
图6  600 K下A和B模型的应力-应变曲线和位错密度-应变曲线
图7  600 K下A和B模型随应变增加的构型演变图
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