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Article Dans Une Revue Materials Characterization Année : 2018

In-situ fabrication of graded material with the application of a horizontal magnetic field during directional solidification

Résumé

The present paper proposes a method of graded materials preparation under a low horizontal magnetic field during directional solidification. The external horizontal magnetic field was applied to the mushy zone of the directionally solidified Al-10 wt% Cu and Al-18 wt% Si samples, which was perpendicular to the growth direction. Experimental results demonstrate that the applied horizontal magnetic field produces a gradient size distribution of the primary α(Al) grains in Al-10 wt% Cu alloys and a gradient fraction distribution of primary Si particles in Al-18 wt% Si alloys. 3D numerical simulations indicate that the formation of graded structure should be attributed to the migration of primary phase driven by the thermoelectric magnetic force (TEMF). The formation of segregation channel should be attributed to the TEM convection (TEMC) in the mushy zone. Further, in situ synchrotron X-ray radiography observations of the initial transient of directional solidification show that the primary α(Al) phases were migrated approximately along the direction perpendicular to the magnetic field. These results suggest that the TEM effects can greatly change the growth of primary grains and the solidification structure, and the application of an external horizontal magnetic field would be beneficial to fabricate the graded material during directional solidification.
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Dates et versions

hal-01900950 , version 1 (24-04-2019)

Identifiants

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Dafan Du, Yves Fautrelle, Anping Dong, Da Shu, Guoliang Zhu, et al.. In-situ fabrication of graded material with the application of a horizontal magnetic field during directional solidification. Materials Characterization, 2018, 141, pp.423-432. ⟨10.1016/j.matchar.2018.05.007⟩. ⟨hal-01900950⟩
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