Droplet Evolution and Refinement During Liquid–Liquid Decomposition of Zn-6 Wt Pct Bi Immiscible Alloy Under High Static Magnetic Fields

Zheng, Tianxiang; Zhong, Yunbo; Wang, Jiang; Ren, Zhongming; Ren, Weili; Lei, Zuosheng; Debray, F.; Beaugnon, Eric; Wei, Xicheng

doi:10.1007/s11661-018-4638-8

Cited by 12 publications

(3 citation statements)

References 33 publications

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“…Thus, a non-isothermal interface and a J TE will form between the dendrite and the liquid melt surrounding it (the yellow closed circle in Figure 5d). Previous research [51] discovered that a thermoelectric magnetic force (TEMF), created by the interaction of the J TE and an external ASMF, can induce macroscopic unidirectional thermoelectric magnetic convection (TEMC), which would inevitably alter the heat transfer characteristics at the solid-liquid interface. Due to the interaction between J TEX (the x-component of J TE , yellow arrows) and the external ASMF, a macroscopic unidirectional TEMC is also presented in this study, as shown in Figure 5e (the top view of the metal pool).…”

Section: Shallower Metal Pool and Mechanismsmentioning

confidence: 99%

Morphology Control of Metal Pool and Eutectic Carbides in Electroslag Remelted M2 HSS with an External Axial Static Magnetic Field

Zhao

Sun

Xia

et al. 2023

Metals

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This study investigates the influence of a superimposed axial static magnetic field (ASMF) on the morphology of metal pool and eutectic carbides (ECs) in electroslag remelted M2 high-speed steel (HSS). The application of ASMF caused the metal pool to become shallower, and the solidified structure to expand axially, along with finer (i.e., more uniformly distributed and crystallographically oriented) ECs. Lorentz force-driven unidirectional circulation in slag pool was the primary cause of the metal pool’s morphological adjustment; this resulted in a more homogenous temperature distribution in slag pool. Thus, the heat transfer from the slag pool to the metal pool became more uniform, creating a metal pool that is shallower. Additionally, local solidification time (LST) became shorter, while the number of (Ti, V)N-Al2O3 inclusions serving as heterogeneous nuclei for EC formation increased due to ASMF, enabling finer EC with more crystallographic orientations in ESR ingots.

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Section: Shallower Metal Pool and Mechanismsmentioning

confidence: 99%

Morphology Control of Metal Pool and Eutectic Carbides in Electroslag Remelted M2 HSS with an External Axial Static Magnetic Field

Zhao

Sun

Xia

et al. 2023

Metals

Self Cite

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“…Immiscible alloys exhibit a specific type of phase diagram characterized by a miscibility gap in the liquid state [1][2][3][4]. When cooling into the miscible gap, decomposition will happen, a homogeneous single-phase liquid separates into two liquids that are immiscible with each other and will form distinct phases [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The Influences of Micro-Alloying Element Sn and Magnetic Field on the Microstructure Evolution of Al–Bi Immiscible Alloys

Chen,

Jiang,

Zhao

2023

Metals

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An investigation was conducted through directional solidification experiments to explore the impact of micro-alloying element Sn and a magnetic field on the solidification behavior of immiscible Al–Bi alloys, as well as the combined effect of Sn and the magnetic field. Experimental results show that the size distribution of the dispersed particles in the low-speed solidified Al–3.4 wt.%Bi alloy presents two peaks, while it only shows one peak when solidified at a relatively high speed. The addition of Sn not only can enhance the nucleation rate and the number density of the Bi-rich droplets in the sample, but also decrease the Marangoni migration velocity and the axial resultant velocity of minority phase droplets in front of the solidification interface. Thereby it promotes the formation of Al–Bi alloys with a well-dispersed microstructure. A static magnetic field with the strength of 0.2 T increases the number density of the dispersed particles and decreases the average size and the size distribution width of the dispersed particles. Under the effect of Sn addition and static magnetic field, the average radius of the dispersed particles R and the solidification velocity V0 satisfy R∝V0−1/3 when the alloy was solidified at a relatively low velocity, R and V0 satisfy R∝V0−1/2 when the alloy is solidified at a high velocity.

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“…1–8 They are especially suitable for the manufacturing of either in situ particle composite materials or composite materials with a core/shell structure and thus have a strong industry application background. 9–13 For instance, Al-Bi alloy can be used as the advanced bearings if the soft Bi phase disperses uniformly in a comparatively hard Al-based matrix, 14,15 and Cu-Fe and Cu-Cr alloys are high-strength, high-electrical-conductivity materials. 16–19 However, these alloys have an essential drawback, in that the miscibility gap poses problems during solidification.…”

Section: Introductionmentioning

confidence: 99%

Effect of microgravity on the solidification of aluminum–bismuth–tin immiscible alloys

Jiang

Zhang

et al. 2019

npj Microgravity

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Directional solidification experiment was carried out with Al-Bi-Sn immiscible alloy under microgravity environment onboard the Tiangong 2 space laboratory of China. Sample with a well-dispersed microstructure was obtained by properly designing the experimental scheme, the matrix shows equiaxed morphology, and there is no visible gas cavity or pinhole in the sample. In contrast, the reference samples solidified on earth show phase-segregated structure and contain some gas cavities or pinholes. The grain morphology of the terrestrial sample depends on the solidification direction, it is equiaxed when the sample ampoule was withdrawn against the gravity direction, while it is columnar when the sample ampoule was withdrawn along the gravity direction. The solidification process and affecting mechanisms of microgravity on the microstructure formation are discussed. The results indicate that the microgravity conditions can effectively diminish the convective flow of the melt and the Stokes motions of the minority phase droplets and gas bubbles, which are helpful for suppressing the occurrence of macro-segregation and preventing the formation of porosity. The results also demonstrate that the microgravity conditions favor the detachment between the melt and the wall of crucible, thus increasing the nucleation undercooling of α-Al nuclei and promoting the formation of equiaxed grain.

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Droplet Evolution and Refinement During Liquid–Liquid Decomposition of Zn-6 Wt Pct Bi Immiscible Alloy Under High Static Magnetic Fields

Cited by 12 publications

References 33 publications

Morphology Control of Metal Pool and Eutectic Carbides in Electroslag Remelted M2 HSS with an External Axial Static Magnetic Field

Morphology Control of Metal Pool and Eutectic Carbides in Electroslag Remelted M2 HSS with an External Axial Static Magnetic Field

The Influences of Micro-Alloying Element Sn and Magnetic Field on the Microstructure Evolution of Al–Bi Immiscible Alloys

Effect of microgravity on the solidification of aluminum–bismuth–tin immiscible alloys

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