Evolution of microstructure and microsegregation in Ni-Mn-Ga alloys directionally solidified under axial magnetic field

Hou, Long; Dai, Yanchao; Fautrelle, Yves; Li, Zongbin; Ren, Zhongming; Esling, Claude; Xi, Li

doi:10.1016/j.jallcom.2018.05.136

Cited by 18 publications

(3 citation statements)

References 30 publications

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“…11) Hou et al indicated that the SMF refined cells/dendrites and reduced microsegregation of NiMnGa alloy. 12) In our recent work, it was found that the extent of microsegregation in the Al4.5 mass%Cu alloy increased in the SMF. 13) These investigations have showed that the SMF leads to a change in microsegregation.…”

Section: Introductionmentioning

confidence: 88%

Enhanced Dendrite Coarsening and Microsegregation in Al–Cu Alloy under a Steady Magnetic Field

Zhan

et al. 2019

Mater. Trans.

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The final mechanical properties of alloys are significantly influenced by the secondary dendrite arm spacing (SDAS). The application of a steady magnetic field (SMF) during solidification is a novel method to control the SDAS, however, the nature of the change in SDAS under an SMF is still an open question. In this work, dendrite coarsening in the Al4.5 mass%Cu alloy in an SMF and its effect on microsegregation were investigated experimentally by the quenching technique. The coarsening experiments showed that the SDAS increased in an SMF, which was mainly attributed to the thermoelectric magnetic convection (TEMC) while the change in solid/liquid interfacial tension in the SMF played an adverse role. Further, the variation of the microsegregation level in the SMF was examined by composition measurements. It was shown that the segregation ratio increased in the SMF, which could be ascribed to the reduction of diffusivity in the solid phase and the enlargement of SDAS in the SMF. Using a modified analytical model developed by Voller, the microsegregation levels with and without an SMF were predicted, which was in agreement with the experimental results.

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Section: Introductionmentioning

confidence: 88%

Enhanced Dendrite Coarsening and Microsegregation in Al–Cu Alloy under a Steady Magnetic Field

Zhan

et al. 2019

Mater. Trans.

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“…The reduction in the microsegregation level during solidification can shorten the subsequent heat treatment process and also improve the mechanical performance [47,69,70]. Previous experimental studies have shown that the SMF was capable of modifying the extent of microsegregation during alloy solidification [19,[71][72][73][74]. However, these studies were mostly limited to qualitative analysis with respect to the effect of the SMF on segregation.…”

Section: Smf-controlled Segregationmentioning

confidence: 99%

Solidification Processing of Metallic Materials in Static Magnetic Field: A Review

Hou

Zhan-yong

2022

Metals

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The application of a static magnetic field (SMF) to solidification processing has emerged as an advanced strategy for efficiently regulating the macro/micro structures and the mechanical performance of metallic materials. The SMF effects have been proved to be positive in various processes of metal solidification. Firstly, this review briefly introduces two basic magnetic effects, i.e., magnetohydrodynamic effects and magnetization effects, which play crucial roles in regulating metal solidification. Further, the state of the art of solidification processing in the SMF, including undercooling and nucleation, interface energy, grain coarsening and refinement, segregation and porosity, are comprehensively summarized. Finally, the perspective future of taking advantage of the SMF for regulating metal solidification is presented.

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“…Over the past decades, the utilization of magnetic fields used to materials processing has attracted extensive attention owing to its various effects, such as enhanced undercooling [6,7], field-modified convection [8,9] and solute/ phase migration [10,11]. Thereinto, several publications have reported that the alternating magnetic field (AMF) is able to modify microsegregation during alloys solidification [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Reduction in Microsegregation in Al–Cu Alloy by Alternating Magnetic Field

Zhan

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The microsegregation behavior of the Al-4.5 wt%Cu alloy solidified at different cooling rates under the alternating magnetic field (AMF) was investigated. The experimental results showed that the amount of non-equilibrium eutectics in the interdendritic region decreased upon applying the AMF at the same cooling rate. The change in microsegregation could be explained quantificationally by the modifications of dendritic coarsening, solid-state back diffusion and convection in the AMF. The enhanced diffusivity in the solid owing to the AMF was beneficial for the improvement in microsegregation compared to the cases without an AMF. In contrast, the enhanced dendritic coarsening and forced convection in the AMF were found to aggravate the microsegregation level. Considering the contributions of the changes in above factors, an increase in solid diffusivity was found to be primarily responsible for the reduced microsegregation in the AMF. In addition, the microsegregation in the AMF was modeled using the analytical model developed by Voller. The calculated and experimental results were in reasonable agreement.

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Evolution of microstructure and microsegregation in Ni-Mn-Ga alloys directionally solidified under axial magnetic field

Cited by 18 publications

References 30 publications

Enhanced Dendrite Coarsening and Microsegregation in Al–Cu Alloy under a Steady Magnetic Field

Enhanced Dendrite Coarsening and Microsegregation in Al–Cu Alloy under a Steady Magnetic Field

Solidification Processing of Metallic Materials in Static Magnetic Field: A Review

Reduction in Microsegregation in Al–Cu Alloy by Alternating Magnetic Field

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