Effective parameter for the selection of modifying agent for Al–Si alloy

To select effective modifying agent for Al–Si alloys, in addition to conventional parameters such as the crystal structure and lattice constant, the mixing enthalpy, which was calculated by the Miedema model, was newly considered. The large negative value of mixing enthalpy was counted as a new para...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2007-03, Vol.449, p.334-337
Main Authors: Kang, H.S., Yoon, W.Y., Kim, K.H., Kim, M.H., Yoon, Y.P., Cho, I.S.
Format: Article
Language:English
Subjects:
Alloys
Al–Si alloy
Condensed matter: structure, mechanical and thermal properties
Effective parameter
Exact sciences and technology
Miedema model
Modifying agent
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary:To select effective modifying agent for Al–Si alloys, in addition to conventional parameters such as the crystal structure and lattice constant, the mixing enthalpy, which was calculated by the Miedema model, was newly considered. The large negative value of mixing enthalpy was counted as a new parameter. According to the result of calculation, four elements, including Sr, Y, Sm and Gd, which have large negative mixing enthalpies with Si, were selected as modifying agent for eutectic Si crystals. It was observed that these elements result in the modification of the eutectic Si crystals and that the eutectic depression of the modified alloy is larger than 6 K.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.02.363