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Metallurgical and Materials Transactions A

Erschienen in:

01.05.2008

Directional Solidification and Microstructural Refinement of Immiscible Alloys

verfasst von: Jie He, Jiuzhou Zhao, Haili Li, Xianfei Zhang, Qinxia Zhang

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 5/2008

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Abstract

The directional solidification has been carried out for Al-9, 12Bi, and Al-3.4Bi-2.5Si (wt pct) alloys in a Bridgman apparatus with a transversal magnetic field. The microstructure of the alloy samples solidified at different melt superheat (MS) temperatures and magnetic field strengths has been observed. It was indicated that the average size of the Bi-rich spheres and the primary dendrite spacing decrease with the increase of the melt superheat (MS) temperature. The effect of the MS treatment on the interface morphology and the interaction between the spheres and the solidification interface has been discussed for the immiscible alloys. Moreover, the influence of the transverse magnetic field on the solidification microstructure was analyzed. The larger the magnetic field strength, the smaller is the average size of the spheres. The effects of the magnetic field on the spheres’ nucleation, the spatial movement, and the collision between the spheres were discussed. The application of the magnetic field results in the formation of the sphere-aligned structure even for the hypermonotectic alloys, and the formation mechanism has been explained in this article.

Vorheriger Artikel Fractography of Stress Corrosion Cracking of Mg-Al Alloys

Nächster Artikel Microsegregation during Solidification of an Al-Cu Binary Alloy at Largely Different Cooling Rates (0.01 to 20,000 K/s): Modeling and Experimental Study

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Titel: Directional Solidification and Microstructural Refinement of Immiscible Alloys
verfasst von: Jie He
Jiuzhou Zhao
Haili Li
Xianfei Zhang
Qinxia Zhang
Publikationsdatum: 01.05.2008
Verlag: Springer US
Erschienen in: Metallurgical and Materials Transactions A / Ausgabe 5/2008
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI: https://doi.org/10.1007/s11661-008-9499-0

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