Effect of a high magnetic field on the growth of ε-CuZn5 dendrite during directionally solidified Zn-rich Zn–Cu alloys - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Materials Characterization Année : 2016

Effect of a high magnetic field on the growth of ε-CuZn5 dendrite during directionally solidified Zn-rich Zn–Cu alloys

Résumé

The effect of an axial high magnetic field on the growth of epsilon-CuZn5 dendrite during directionally solidified Zn-rich Zn-Cu peritectic alloys was investigated. Experimental results revealed that the magnetic field caused the deformation of the epsilon-CuZn5 dendrite and induced the occurrence of the columnar-to-equiaxed transition of the epsilon-CuZn5 dendrite. Further, EBSD technology was applied to study the dendrite morphology and crystalline orientation in details. It was found that the regular epsilon-CuZn5 columnar dendrite formed and was oriented with the <0001>-crystal direction along the solidification direction at moderate growth speeds (i.e., 10-50 mu m/s). When a high magnetic field was applied, equiaxed grains with various random orientations formed. Further, the magnetic crystalline anisotropy of the epsilon-CuZn5 crystal was studied. Experimental results showed that the epsilon-CuZn5 crystal owns a magnetic crystalline anisotropy and the <0001>-crystal direction is its easy magnetization axis. Moreover, numerical results indicated that a thermoelectric magnetic force acted on the solid near the liquid/solid interface and increased linearly with the magnetic field. The degeneration and breakup of the epsilon-CuZn5 dendrites during directional solidification of the Zn-Cu alloys under the magnetic field may be primarily due to the thermoelectric magnetic force acting on the solid.

Domaines

Matériaux
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Dates et versions

hal-01367833 , version 1 (02-03-2023)

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Paternité - Pas d'utilisation commerciale

Identifiants

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Dafan Du, Guang Guan, Annie Gagnoud, Yves Fautrelle, Zhongming Ren, et al.. Effect of a high magnetic field on the growth of ε-CuZn5 dendrite during directionally solidified Zn-rich Zn–Cu alloys. Materials Characterization, 2016, 111, pp.31-42. ⟨10.1016/j.matchar.2015.11.004⟩. ⟨hal-01367833⟩
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