Effects of high magnetic fields on solidified structures of Mn-90.4 wt% Sb hypoeutectic alloy

Abstract

Mn-90.4 wt% Sb alloy specimens were solidified under both uniform magnetic field and magnetic field gradient conditions. The solidification behavior was examined to elucidate the effects of high magnetic fields on the solidified structure evolution of this hypoeutectic alloy. The macrostructures on the longitudinal section of the alloys were investigated by optical microscopy and x-ray diffraction (XRD). The volume fraction of primary MnSb phases and the interrod spacing of the eutectic were measured by metallographic analysis. It was found that the segregation of the primary MnSb particles at the certain regions of the specimens occurred under the influence of high magnetic field gradients. The MnSb phases obtained under magnetic fields were oriented with their (h0 l) planes along the direction of the magnetic field. Both the volume fraction of primary MnSb phases and the interrod spacing of the eutectic were decreased upon the application of the high magnetic fields.

Progress on High Magnetic Field-Controlled Transport Phenomena and Their Effects on Solidification Microstructure

“…They attributed this decrease to the weakness of the solute diffusion in front of the growth interface of the dendrite and eutectic. A similar decrease was also observed in the growth of the Al-Al2Cu 62) and MnSb-Sb 63) eutectics and the SDAS of the α dendrites in an Al-Li alloy. 64) Incorporated with other magnetic field effects such as magnetic orientation, 65) the change of the solute diffusion induced by the magnetic field has also been suggested to modify the growth of the materials with a magnetically anisotropic behavior.…”

Solidified Structure Control of Metallic Materials by Static High Magnetic Fields

“…63,65) While for the alloys of far from eutectic compositions, the primary MnSb was segregated in one side of the specimens with a continuous change in volume fraction. 64,65) For instance, the microstructures of Mn-89.7wt%Sb alloys solidified in high magnetic field gradients indicate the separation of both primary phases and their graded distributions, as shown in Fig. 5.…”

“…Recently, the possibility of directly controlling the distribution of solute elements in alloys during solidification process using high magnetic field gradient was investigated by Wang et al 63,64) and Liu et al 65) Mn-Sb alloy was chosen to investigate because Mn has the largest magnetic susceptibility under melting conditions and can exhibit a strong response to the magnetic field gradient. A series of Mn-Sb alloys were solidified in various magnetic field gradients.…”

Effect of Solidification on Microstructure and Properties of FeCoNi(AlSi)0.2 High-Entropy Alloy Under Strong Static Magnetic Field

“…As a clean, non-contact and high-density energy, the magnetic field can act on the atomic scale of substances. As a result, it brings many unique impacts to the material processing, e.g., levitation [ 12 ], nucleation [ 13 ], phase transition thermodynamics [ 14 , 15 ], texturing and orientation [ 16 , 17 , 18 ], organizational refinement [ 19 ] and convection [ 20 ]. The effect of SSMF on the microstructure during solidification is bound to the properties of the material after solidification, such as mechanical properties [ 21 ], thermoelectric properties [ 21 , 22 ] and magnetic properties [ 23 , 24 ].…”