钛合金中TiC晶体的配位多面体生长基元与生长习性

无机材料学报

钛合金中TiC晶体的配位多面体生长基元与生长习性

金云学^1,2; 李庆芬²

1. 江苏科技大学材料科学与工程学院; 镇江 212003; 2. 哈尔滨工程大学机电学院; 哈尔滨 150001

收稿日期:2003-11-05 修回日期:2003-12-11 出版日期:2004-11-20 网络出版日期:2004-11-20

Growth Elements and Growth Habit of Coordination Polyhedrons of TiC Crystal in Titanium Alloy

JIN Yun-Xue^1,2; LI Qing-Fen²

1. School of Material Science & Engineering; Jiangsu University of Science and Technology; Zhenjiang 212003; China; 2. Harbin Engineering University; Harbin 150001; China

Received:2003-11-05 Revised:2003-12-11 Published:2004-11-20 Online:2004-11-20

摘要/Abstract

摘要： 铸造钛合金中存在八面体、棱面枝晶及光滑树枝晶等不同形态的TiC.本文结合定向凝固试样组织,用配位多面体理论分析了钛合金中TiC的生长基元及生长习性.认为TiC的配位多面体生长基元为六配位的TiC₆,TiC₆生长基元堆积时, {100}面族和{111}面族上的生长速率不同,容易形成以{111}面为显露面的八面体状TiC晶胚.TiC晶胚在熔体中生长时,在生长速率最快的<100>方向上生长出二次枝晶臂,并在生长过程中始终保持小面界面生长特征,最终形成棱面枝晶状TiC.如TiC晶体生长时生长速率慢的面族上形成大量的螺旋位错等缺陷,则棱面消失,形成树枝晶TiC.

关键词: 钛合金, TiC, 生长基元, 生长习性

Abstract: The shape of TiC can be octahedral, facet or/and non-facet dendrite in as-cast Titanium alloys. The growth
element and growth habit of TiC₆ in titanium alloys were analyzed with the theory of coordination polyhedron through directionally solidified
samples. The results indicate that the growth elements of TiC are TiC₆ with six coordinations. During the stacking of TiC₆ growth element, the
growth rates of families {100} and {111} are different, which may easily result in potential nuclei of octahedral TiC surrounded by {111}. During
the growing of TiC in the melt, the undercooling and composition at different part of the crystal’s surface vary significantly. Some quadratic dendrites
may appear in the direction of <100> and are characterized by facet growth resulting in facet dendritic TiC finally. If a large amount of
defects such as screw dislocation are foed on the slowly growing surface of TiC during the growth, the facet will disappear and non-facet dendritic
TiC will fo.

Key words: titanium alloy, TiC, growth element, growth habit

中图分类号:

O781

金云学,李庆芬. 钛合金中TiC晶体的配位多面体生长基元与生长习性[J]. 无机材料学报.

JIN Yun-Xue,LI Qing-Fen. Growth Elements and Growth Habit of Coordination Polyhedrons of TiC Crystal in Titanium Alloy[J]. Journal of Inorganic Materials.

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