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金属学报  2018, Vol. 54 Issue (5): 657-668    DOI: 10.11900/0412.1961.2017.00543
  金属材料的凝固专刊 本期目录 | 过刊浏览 |
定向凝固晶粒竞争生长的研究进展
王锦程(), 郭春文, 李俊杰, 王志军
西北工业大学凝固技术国家重点实验室 西安 710072
Recent Progresses in Competitive Grain Growth During Directional Solidification
Jincheng WANG(), Chunwen GUO, Junjie LI, Zhijun WANG
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
引用本文:

王锦程, 郭春文, 李俊杰, 王志军. 定向凝固晶粒竞争生长的研究进展[J]. 金属学报, 2018, 54(5): 657-668.
Jincheng WANG, Chunwen GUO, Junjie LI, Zhijun WANG. Recent Progresses in Competitive Grain Growth During Directional Solidification[J]. Acta Metall Sin, 2018, 54(5): 657-668.

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摘要: 

竞争生长是材料微观组织演化过程中普遍存在的现象,不同组织间(包括相、枝晶、晶粒等)均可能存在竞争生长,这些竞争作用对最终微观组织的形成及力学性能具有重要影响。不同取向晶粒间的竞争生长控制是材料微观组织调控的重要环节,尤其是对定向单晶叶片的制备,不同取向晶粒间的竞争生长是决定能否成功获得完整单晶结构的关键因素。近年来,一方面单晶材料制备要求的不断提高,迫切需要有关晶粒竞争生长机制及规律方面的理论性指导,另一方面经典晶粒竞争生长理论预测结果与实验观测并不相符,有时甚至可能完全相反,这使得定向凝固过程中不同取向晶粒间的竞争生长问题日益成为一个热门的研究课题。本文首先回顾了Walton-Chalmers模型的晶粒竞争生长机制及其所受到的严重挑战,然后分别对定向凝固二维条件下汇聚生长和发散生长及三维条件下晶粒竞争生长的研究现状进行了述评,并介绍了本课题组近年来基于相场法数值模拟在定向凝固晶粒竞争生长研究方面的工作进展,最后对定向凝固过程中不同取向晶粒之间的竞争生长研究进行了总结与展望。
关键词 ： 定向凝固,  晶粒竞争生长,  相场法,  研究进展    
Abstract：

Competitive growth between different structures including phases, dendrites and grains is a common phenomenon existing in various microstructure evolution processes. The overgrowth outcome of competitive growth has a paramount influence on final solidification microstructures and mechanical behaviors of materials. The competitive grain growth during directional solidification is a key factor for microstructures controlling, especially for the preparation of single crystal turbine blades. In recent years, the competitive grain growth during directional solidification becomes a hot spot due to an increasing demand for the single crystal preparation and inconsistent experimental results with the classical Walton-Chalmers model. In this paper, the mechanism of competitive grain growth based on the classical Walton-Chalmers model and its challenges were firstly discussed, and then some recent research progresses in converging growth and diverging growth in two dimensional spaces, and non-uniplanar growth in three dimensional spaces were reviewed. Furthermore, the recent works of our group on competitive grain growth during directional solidification by using the phase field method were introduced. Finally, the outlooks of future studies on competitive grain growth during directional solidification are presented.
Key words： directional solidification    competitive grain growth    phase field method    research progress
收稿日期: 2017-12-20     
ZTFLH:  TG244  
基金资助:资助项目 国家自然科学基金项目Nos.51371151和51571165
作者简介:

作者简介 王锦程,男,1972年生,教授,博士
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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00543      或      https://www.ams.org.cn/CN/Y2018/V54/I5/657

图1  Walton-Charmers 示意图模型[22]
图2  高温合金定向凝固过程中汇聚双晶生长发生的反常淘汰[32]
图3  定向凝固汇聚双晶生长中的反常淘汰现象[22,39]
图4  不同时刻的枝晶组织形貌[54]
图5  发散晶界处择优枝晶的侧向分枝行为[54]
图6  不同构型下的晶粒竞争生长示意图[54]
图7  三维空间中双晶构型关系示意图[40]
图8  大尺度汇聚双晶竞争生长模拟[50]
图9  汇聚双晶生长过程的横截面微观组织[41]
图10  镍基高温合金异面竞争生长实验结果[35,40]
图11  异面竞争生长过程中择优取向晶粒新生一次臂形成过程的相场法模拟结果
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