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TEMC is based on the principle that thermoelectric current in a fluid can create a driving force responsible for convection in the presence of an applied magnetic field crossing these current.1) Due to fact that the magnetic field is capable of damping the melt convection, the effect of the magnetic field on solidification structure has been investigated for several decades.2–4) However, Boettinger et al.5) found that no influence on microstructure was detected during the directional solidification of the Pb-57wt%Sn alloy under a transverse or an axial magnetic field of 0.1 T. Tewari et al.6) studied the effect of a higher transverse magnetic field of 0.45 T on cellular array in the directionally solidified hypoeutectic Pb-17.7wt%Sn alloy and the results showed that the cellular array was severely distorted at very low growth speeds (less than 1 μm/s), showing “stripes” of freckles perpendicular to the magnetic field direction. They argued that this phenomenon could be due to the braking of one of the components of the natural thermosolutal convection by the field. Alboussiere7) and Laskar8) systematically studied Experimental and Numerical Investigations of the Multi-scale Thermoelectromagnetic Convection on the Microstructure during Directionally Solidified Sn-5wt%Pb Alloys

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Experimental and Numerical Investigations of the Multi-scale Thermoelectromagnetic Convection on the Microstructure during Directionally Solidified Sn-5wt%Pb Alloys