康慧君

(教授)

 博士生导师  硕士生导师
学位:博士
性别:男
毕业院校:哈尔滨工业大学
所在单位:材料科学与工程学院
电子邮箱:kanghuijun@dlut.edu.cn

论文成果

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Faceted-nonfaceted growth transition and 3-D morphological evolution of primary Al6Mn microcrystals in directionally solidified Al-3 at.% Mn alloy

发表时间:2019-03-11 点击次数:

论文名称:Faceted-nonfaceted growth transition and 3-D morphological evolution of primary Al6Mn microcrystals in directionally solidified Al-3 at.% Mn alloy
论文类型:期刊论文
发表刊物:JOURNAL OF MATERIALS RESEARCH
收录刊物:EI、SCIE、Scopus
卷号:29
期号:11
页面范围:1256-1263
ISSN号:0884-2914
摘要:A comprehensive understanding of the growth pattern of intermetallic compounds (IMCs) during solidification is critical to both the crystal-growth theory and its property optimization. In this article, growth pattern and three-dimensional (3D) morphology of primary Al6Mn IMC were investigated in directionally solidified Al-3 at.% Mn alloy at a wide range of growth rates. A transition from faceted (<60 mu m/s) to nonfaceted growth (> 100 mu m/s) was observed with increasing growth rates. Correspondingly, 3D morphologies of primary Al6Mn change from a solid polyhedron to a hollow structure, and then to a dendrite. This kind of change is associated with the competitive growths of different crystal planes determined by the crystallographic anisotropy and growth kinetics of Al6Mn. A growth model based on atomic cluster attachment is proposed to reveal the growth transition, and a growth-rate ratio between different crystal planes is used to appropriately reveal the formation mechanism of different morphologies at low rates.
发表时间:2014-06-01