Solute diffusion controlled dendritic growth under high undercooling conditions

被引：7

作者：

Cao, CD ^{[1
]}

Lu, XY ^{[1
]}

Wei, BB ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Dept Appl Phys, Xian 710072, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 1998年 / 15卷 / 11期

关键词：

D O I：

10.1088/0256-307X/15/11/021

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Liquid Cu70Co30 alloy is undercooled up to 363 K (0.22 T-L) by using glass-fluxing technique. The LKT/BCT dendritic growth theory is modified and made applicable to predict the kinetic characteristics of dendritic growth in those alloy systems which have extremely curved liquidus and solidus lines, Actual calculations reveal that the dendritic growth of primary alpha-Co phase in Cu70Co30 alloy is constantly controlled by solute diffusion. The growth velocity of alpha-Co dendrite has a maximum value of 54.5 mm/s at an undercooling of 333 K. The calculated solubility of Cu in alpha-Co dendrite decreases with the increase of undercooling, which agrees well with the experimental data. Prior to peritectic transformation, the growth of alpha-Co dendrite is close to equilibrium solidification.

引用

页码：840 / 842

页数：3

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