Influence of high magnetic field on the liquid-liquid phase separation behavior of an undercooled Cu–Co immiscible alloy

Chen, Wei; Wang, Jun; He, Yixuan; Li, Jinshan; Beaugnon, Eric

doi:10.1016/j.jallcom.2020.155502

Cited by 27 publications

(8 citation statements)

References 34 publications

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“…With the separation of the liquid phase, the Cr-rich droplets migrate to the core of the sample under the action of Marangoni and Stokes motions [15] as shown in figure 2. Since the melting point of Cr is higher than that of Cu, the liquid Cr will solidify before liquid Cu.…”

Section: Resultsmentioning

confidence: 99%

Effects of Cr content and electromagnetic stirring on the phase separation of Cu-Cr alloy

Yang¹,

Qinglin²

2022

Mater. Res. Express

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The Cu-Cr immiscible alloys were prepared by arc melting. The effects of Cr addition and electromagnetic stirring on the phase separation, microstructure were examined. The results show that serious phase segregation occurs at the center of the sample with increasing Cr contents, forming a sandwich like structure. The shape of the primary Cr transforms from fine dendrite to more developed dendrite. Thermodynamic analysis indicates that Cr addition increases the driving force for the liquid phase separation. The electromagnetic stirring can facilitate the relative motion between the Cr droplets and the melts, and thus intensify the segregation phenomenon. With Cr additions, the hardness in non-segregated area shows only slight increase, and in Cr segregated area shows a significant increase. While the electrical conductivity shows only slight decrease with increasing Cr content.

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Section: Resultsmentioning

confidence: 99%

Effects of Cr content and electromagnetic stirring on the phase separation of Cu-Cr alloy

Yang¹,

Qinglin²

2022

Mater. Res. Express

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“…For a stubby sample, the demagnetization factor will be huge. According to research by Wei [28] , when the radius of the Fe-rich phase is greater than a certain size determined by the magnetic field strength, the static magnetic energy is greater than the surface energy of the alloy, and the Fe-rich phase in the melt will be destabilized. At that moment, the demagnetization factor N of the spherical Fe-rich phase is very large, and in order to reduce the overall energy of the system, the Fe-rich phase is stretched along the direction of the magnetic field.…”

Section: Resultsmentioning

confidence: 99%

Effect of high magnetic field on solidification microstructure evolution of a Cu-Fe immiscible alloy

Yan

Chen

et al. 2022

China Foundry

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Immiscible alloy, also known as liquid phase separation alloy, has been of increasing interest in recent years. Many immiscible alloys have special physical and mechanical properties [1][2][3][4] . For instance, liquid immiscible alloys like Cu-Pb and Al-Pb alloys with high thermal conductivity and low friction coefficient can be used as advanced bearing materials [5] , and Cu-Co system alloys are excellent magneto-resistive materials [6] .Liquid phase separation is an important phenomenon for immiscible alloys. During the solidification process, when the alloy cools to the critical temperature, the melt immediately enters the immiscible zone and undergoes a phase transformation in which the parent phase L decomposes into two liquid phases, L 1 and L 2 , with different compositions and densities. Finally, the liquid

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“…The increase of undercooling under HMF was ascribed to the inhibition of melt convection by Lorentz forces, which could delay the formation of oxides required for heterogeneous nucleation. However, Wei et al [52] found that the application of HMF would increase the nucleation temperature, resulting in a decrease in the undercooling (see Figure 5b). For magnetic material, during the non-equilibrium solidification, HMF has a great influence on the solidification point.…”

Section: Hmf Effects On Nucleation Of Immiscible Alloymentioning

confidence: 96%

“…A series of immiscible alloys with unique microstructures were prepared by controlling the distribution of the phase during the solidification process under HMF. Wei et al [52] analyzed the influence of HMF on the microstructure evolution of undercooled Cu-Co alloy. Without the HMF, the initial form of Co-rich phase was spherical.…”

Section: Microstructure Of Immiscible Alloys Modified By Hmf 351 Hmentioning

confidence: 99%

“…The solidification microstructure of Cu 66.67 Co 33.33 alloys under different magnetic fields with the undercooling of 260 K: (a) 0 T, overview optical microscope image; (b) 10 T, an optical micrograph of parallel to the direction of magnetic field; (c) 10 T, an optical micrograph of perpendicular to the direction of magnetic field; a1, b1, c1 3-dimensional microstructure of (a-c)[52].…”

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confidence: 99%

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Solidification of Immiscible Alloys under High Magnetic Field: A Review

Chen

Wang

et al. 2021

Metals

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Immiscible alloy is a kind of functional metal material with broad application prospects in industry and electronic fields, which has aroused extensive attention in recent decades. In the solidification process of metallic material processing, various attractive phenomena can be realized by applying a high magnetic field (HMF), including the nucleation and growth of alloys and microstructure evolution, etc. The selectivity provided by Lorentz force, thermoelectric magnetic force, and magnetic force or a combination of magnetic field effects can effectively control the solidification process of the melt. Recent advances in the understanding of the development of immiscible alloys in the solidification microstructure induced by HMF are reviewed. In this review, the immiscible alloy systems are introduced and inspected, with the main focus on the relationship between the migration behavior of the phase and evolution of the solidification microstructure under HMF. Special attention is paid to the mechanism of microstructure evolution caused by the magnetic field and its influence on performance. The ability of HMF to overcome microstructural heterogeneity in the solidification process provides freedom to design and modify new functional immiscible materials with desired physical properties. This review aims to offer an overview of the latest progress in HMF processing of immiscible alloys.

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Influence of high magnetic field on the liquid-liquid phase separation behavior of an undercooled Cu–Co immiscible alloy

Cited by 27 publications

References 34 publications

Effects of Cr content and electromagnetic stirring on the phase separation of Cu-Cr alloy

Effects of Cr content and electromagnetic stirring on the phase separation of Cu-Cr alloy

Effect of high magnetic field on solidification microstructure evolution of a Cu-Fe immiscible alloy

Solidification of Immiscible Alloys under High Magnetic Field: A Review

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