A comparison with model predictions of coupled zone derived growth parameters for primary αAl and βSi dendrites in hypereutectic Al-Si alloys

被引：6

作者：

Jones, H ^{[1
]}

机构：

[1] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England

来源：

SCRIPTA MATERIALIA | 2001年 / 45卷 / 02期

关键词：

growth parameters; dendritic growth; hypereutectic Al-Si alloys; predictive modelling; solidification microstructure selection;

D O I：

10.1016/S1359-6462(01)01011-9

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Limiting velocities reported for growth of αAl and βSi dendrites in competition with eutectic in Bridgman growth of Al-13-17 wt.% Si alloys yield growth parameters 1.4±0.2 K (s/μm)1/3 and 2.5 ± 0.3 K (s/μm)1/2, respectively for the velocity ranges 0.9-10 and 0.01-4 mm s-1. This value for αAl is in accord with predictions from a simple equation. The value of βSi is in agreement with predictions from a more general equation and valid for the very low value of partition coefficient applicable to βSi.

引用

页码：177 / 182

页数：6

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