The effect of strontium on the Mg2Si precipitation process in 6201 aluminum alloy

被引：0
作者：
M. H. Mulazimoglu
A. Zaluska
F. Paray
J. E. Gruzleski
机构：
[1] American Racing Equipment Inc.,the Aluminum Division
[2] McGill University,Department of Physics
[3] McGill University,Department of Mining and Metallurgical Engineering
来源：
Metallurgical and Materials Transactions A | 1997年 / 28卷
关键词：
Material Transaction; Electrical Resistivity; Ultimate Tensile Strength; Subgrain Structure; Coherency Strain;
D O I：
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学科分类号：
摘要：
A transmission electron microscopy (TEM) study of a 6201 aluminum alloy to which controlled strontium additions were made has revealed important differences compared to the same alloy free of strontium. In the as-cast state, strontium favors the formation of α-AlFeSi (Al8Fe2Si) rather than β-AlFeSi (Al5FeSi) phase, resulting in a greater quantity of excess silicon present in the strontium-treated alloy. During heat treatment, the excess silicon allows a greater density of finer β″-Mg2Si precipitates to form, leading to increased tensile strength values and increased electrical resistivity. Strontium also retards the growth of the precipitates formed during heat treatment and inhibits formation of the equilibrium β-Mg2Si phase. As a result, the strontium-treated alloy exhibits a resistance to overaging.
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页码：1289 / 1295
页数：6
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