Mode of dendrite growth in undercooled alloy melts

被引：37
|
作者：
Li, JF [1 ]
Yang, GC [1 ]
Zhou, YH [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
MATERIALS RESEARCH BULLETIN | 1998年 / 33卷 / 01期
基金：
中国国家自然科学基金;
关键词：
alloys; crystal growth; diffusion; microstructure;
D O I：
10.1016/S0025-5408(97)00199-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The mode of dendrite growth in the undercooled Ni-50at%Cu alloy was investigated. At lower undercoolings, the dendrite growth is mainly controlled by solute diffusion, and the formed dendritic morphologies are similar to those of the conventional as-cast equiaxed crystals, except that here the branches are much denser. At higher undercoolings, however, the severe solutal trapping that results from high dendrite growth velocity weakens the effect of solute diffusion on the dendrite growth. In this case, the dendrites branch in the bunching form. The dendrite spacings were measured, and the results were interpreted with the current dendrite growth theories. (C) 1998 Elsevier Science Lid.
引用
收藏
页码：141 / 148
页数：8
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