The effect of Sn additions on the semi-solid microstructure of an Al-7Si-0.3Mg alloy

被引：12

作者：

Kliauga, AM ^{[1
]}

Ferrante, M ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Ctr Ciencias Exatas & Tchn, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2002年 / 337卷 / 1-2期

基金：

巴西圣保罗研究基金会;

关键词：

Al-Si-alloy; tin addition; semi-solid; microstructure; phase diagram;

D O I：

10.1016/S0921-5093(02)00019-9

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

The influence of Sn additions on both the binary Al-Si equilibrium phase diagram and the microstructural evolution of an Al7SiO.3Mg alloy (A356) having a solid/liquid ratio close to 0.5 were studied. Application of the THERMOCALC method showed that in the range 0.2-10.0 wt.%, Sn decreases all the L-S transformation temperatures. The microstructural evolution was studied by scanning electron microscopy (SEM). transmission electron microscopy (TEM) and by quantitative optical microscopy. Results showed that Sn additions decreased the rate of attainment of the equilibrium liquid fraction besides reducing the kinetics of particle spheroidisation and growth. This behaviour was attributed to a decrease of solid-liquid surface energy brought about by the presence of Sri as small globules within the Si or Al phases and at the Al-Si interface. This interpretation was supported by experimental measurements of particle contiguity and by dihedral angle calculations. The less accentuated effect observed on sample 2.0Sn, was explained by a different spatial distribution of the Sn globules. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：67 / 72

页数：6

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