东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

三维晶体相场法模拟位错的预熔及熔解

ISSN号：1003-7551
期刊名称：广西物理
时间：2013
页码：8-11
分类：O734.1[理学—晶体学] TG111.8[金属学及工艺—物理冶金;金属学及工艺—金属学]
作者机构：[1]College of Physical Science and Engineering, Guangxi University, Nanning 530004, China, [2]Guangxi Key Laboratory for Non-Ferrous Metal and Featured Materials, Nanning 530004, China
相关基金：Acknowledgements This work was supported by the National Natural Science Foundation of China （Grant No. 51161003）, the Natural Science Foundation of Guangxi Province （Grant No. 2012GXNSFDA053001） and Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-Ferrous Metal and Featured Materials, Guangxi Zhuang Autonomous Region （Grant No. GXKFJ12-01）.
相关项目：晶体相场(PFC)模型研究纳米晶金属的缺陷演化及其对力学性能的影响

关键词：位错反应, 晶界, 晶体, 相场, 温度条件, 移动, 模拟, 衰变过程, phase field crystal （PFC） model, grain boundary （GB）, premeltingdislocation, strain

中文摘要：

阶段地水晶(陆军) 模型被用来模仿 premelting 脱臼运动对称当系统温度在时，在紧张行动下面倾斜谷物边界(STGB ) 远非，到融化的融化的点和结束分别地指。结果证明当 premelting 温度被接近到，本地 premelting 发生包围脱臼从在温度下面。STGB 的 premelting 脱臼能在紧张行动下面滑行，并且 premelting 区域是为脱臼滑行的一个同伴。STGB 腐烂的过程以二个高温度条件是很类似的。当 premelting 介绍，它减少为脱臼的滑行抵抗并且导致脱臼的一个更快的运动，并且也在 STGB 的腐烂过程期间引起系统的更多的精力减小。尽管有把紧张用于这些， premelting 在 STGB 的整个腐烂过程取样， premelting 脱臼区域显然不发展并且延长。这显示外部紧张行动不在高温度支持 premelting，并且不能导致更多的 premelting 脱臼，它能在脱臼展览附近被欠到 premelting 阶段像液体的性质并且到容易滑行并且放松紧张精力的 premelting 脱臼；这与实验和分子的动力学的结果一致。

英文摘要：

The phase field crystal （PFC） model is used to simulate the premelting dislocation movement of the symmetric tilt grain boundary （STGB） under strain action when the system temperature is at far from the melting point and close to the melting point, respectively. The results show a local premelting occurs surrounding the dislocations as the premelting temperature is approached to from below temperature. The premelting dislocations of the STGB can glide under strain action, and the premelting region is a companion for dislocation gliding. The process of STGB decay is very similar at the two high temperature conditions. As premelting presents, it diminishes the gliding resistance for the dislocations and leads to a faster movement of dislocations, and also brings about more energy reduction of the system during the decay process of STGB. In spite of applying strain to these premelting samples in whole decay processes of STGB, the premelting dislocation region does not obviously develop and extend. This indicates that the external strain action does not promote the premelting at the high temperature, and cannot induce more premelting dislocation, which can be owed to the premelting phase around the dislocation exhibit fluid-like properties and to the premelting dislocation easily gliding and relaxing the strain energy; this is in agreement with the results of experiments and molecular dynamics.

同期刊论文项目