Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第7期    总第184期    2014年7月

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文章编号:1004-0609(2014)07-1778-07
定向退火条件下柱状晶形成及连续扩展的相场模拟
罗志荣1, 2,高英俊2, 3,邓芊芊2,黄礼琳1, 2,黄创高2, 3

(1. 玉林师范学院 物理科学与工程技术学院,玉林 537000;
2. 广西大学 物理科学与工程技术学院,南宁 530004;
3. 广西大学 广西有色金属及特色材料加工重点实验室,南宁 530004
)

摘 要: 基于定向退火条件下的移动热区模型,采用相场法研究定向退火条件下热区宽度对多晶材料中柱状晶形成及连续扩展的影响。模拟结果表明:增加热区宽度有利于形成柱状晶结构,且所得柱状晶的长宽比随着热区宽度的增加而增大;当热区移动速率一定时,柱状晶连续扩展所需临界热区宽度小于形成柱状晶所需临界热区宽度;当热区宽度大于初始晶粒直径的1.5倍时,热区宽度对柱状晶连续扩展的热区移动临界速率的影响很小。

 

关键字: 定向退火;晶界迁移率;柱状晶;相场法

Phase field simulation of formation and continuous propagation of columnar grain structure during directional annealing
LUO Zhi-rong1, 2, GAO Ying-jun2, 3, DENG Qian-qian2, HUANG Li-lin1, 2, HUANG Chuang-gao2, 3

1. College of Physics Science and Engineering, Yulin Normal University, Yulin 537000, China;
2. College of Physics Science and Engineering, Guangxi University, Nanning 530004, China;
3. Guangxi Key Laboratory of Nonferrous Metals and Special Materials Processing, Guangxi University, Nanning 530004, China

Abstract:Based on the moving hot zone model under directional annealing, the effects of the hot zone width on the formation and continuous propagation of columnar grain structure during directional annealing in polycrystalline materials were studied by phase field method. The simulation results show that increasing hot zone width is beneficial to the formation of columnar grain structure, and the aspect ratio of the columnar grain increases with increasing the hot zone width. For a given zone speed, the critical hot zone width for propagation of columnar grain is smaller than that for its formation. When the hot zone width is 1.5 times greater than the initial grain diameter, the effect of the hot zone width on critical hot zone speed necessary for the continuous propagation of columnar grain structure is rarely small.

 

Key words: directional annealing; grain boundary mobility; columnar grain; phase field method

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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