Effect of Ca addition on solidification microstructure of hypoeutectic Al-Si casting alloys

被引：8

作者：

Jiao, Xiang-yi ^{[1
]}

Liu, Chao-feng ^{[1
]}

Wang, Jun ^{[1
]}

Guo, Zhi-peng ^{[1
,2
]}

Wang, Jun-you ^{[3
]}

Wang, Zhuo-ming ^{[3
]}

Gao, Jun-ming ^{[3
]}

Xiong, Shou-mei ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Key Lab Adv Mat Proc Technol, Beijing 100084, Peoples R China

[3] Hong Bang Casting Nanlong Co Ltd, Nantong, Peoples R China

来源：

CHINA FOUNDRY | 2019年 / 16卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Ca addition; primary alpha-Al; eutectic silicon; refinement; MECHANICAL-PROPERTIES; COOLING RATE; EUTECTIC SI; RICH PHASES; NUCLEATION; SILICON; BEHAVIOR; REFINEMENT; STRONTIUM; PRESSURE;

D O I：

10.1007/s41230-019-9014-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effect of Ca addition on the solidification microstructure of hypoeutectic Al-Si casting alloys was investigated using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) methods with particular aftention focused on the change of morphologies of primary alpha-Al and eutectic silicon. Meanwhile, solute distribution in solid-liquid was simulated according to Scheil-Gulliver law. Results showed that primary alpha-Al and eutectic silicon were refined as Ca content increased because of the variation of the solute concentration in liquid. The addition of Ca increased the nucleation sites like Al3Ti or Al2Cu to promote the nucleation of primary alpha-Al. Affected by modification effect of Ca, the shape of eutectic silicon changed from flake to fibrous structure. In addition, coarse plate Ca-rich phases could be found along the grain boundary with high Ca content.

引用

页码：153 / 160

页数：8

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