Microsegregation Formation in Al–Cu Alloy under Action of Steady Magnetic Field

He, Shengya; Li, Chuanjun; Guo, Rui; Wang, Xuan; Ren, Zhongming; Li, Xi; Zhong, Yunbo

doi:10.2355/isijinternational.isijint-2017-616

Cited by 8 publications

(7 citation statements)

References 31 publications

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“…3(a) is independent of the grain number or morphology, but the peak value of SI is apparently affected by the grain refinement. Interestingly, less grains with developed branches lead to a lower peak value of segregation index, which is consistent with the experimental study of He et al [16] who have indicated that the decreases in SDAS would reduce the microsegregation. However, values of SI for different number of grains almost overlap as fS → 1 (Fig.…”

Section: Fig 2(b)supporting

confidence: 91%

“…In contrast, with sufficient space to develop sidebranches, the grain morphology is the main factor affecting the segregation extent. A higher cooling rate promotes the sidebranch formation, thus leading to a lower SI arising from smaller CL and SDAS [16]. Interestingly, similar to the effect of grain number, no matter what extent of the influence by the cooling rate exists during solidification, the curves of SI eventually drop down to a roughly same value when solidification nearly completes.…”

Section: (D))mentioning

confidence: 82%

“…Scheil equation Φ = 0 [3] Lever rule Φ = 1 [3] Brody-Flemings model Φ = 2α Regarding to the effect of grain morphology, it is well known that the solute distribution strongly relies on the solidification microstructure such as the grain size [14,15] and the secondary dendritic arm spacing (SDAS) [16], which depends on the process conditions (e.g. the growth rate of columnar grains during directional solidification [17] and the cooling rate during equiaxed solidification [18,19]).…”

Section: Microsegregation Model Parameter φ Referencesmentioning

confidence: 99%

“…Lower cooling rate causes a higher peak value of SI due to the increase in CL (Fig. 5(a)) and SDAS [16] (Fig. 5(g and h)).…”

mentioning

confidence: 98%

See 3 more Smart Citations

Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy

Gong

Chen

et al. 2021

Journal of Materials Science & Technology

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Section: Fig 2(b)supporting

confidence: 91%

Section: (D))mentioning

confidence: 82%

Section: Microsegregation Model Parameter φ Referencesmentioning

confidence: 99%

“…Lower cooling rate causes a higher peak value of SI due to the increase in CL (Fig. 5(a)) and SDAS [16] (Fig. 5(g and h)).…”

mentioning

confidence: 98%

See 2 more Smart Citations

Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy

Gong

Chen

et al. 2021

Journal of Materials Science & Technology

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“…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. However, up to now, few studies have focused on the effect of the change in dendrite coarsening in the SMF on microsegregation.…”

Section: Introductionmentioning

confidence: 99%

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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Modeling of the Nonuniform Microstructure and Microsegregation Formation of the Shell in Round Billet Continuous Casting

Wei

Wang

Liu

et al. 2022

steel research int.

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To explore the influence of nonuniform heat transfer on the grain structure and microsegregation of carbon in shells inside the mold, a multiscale model considering heat conduction and dendritic growth is constructed for the round billet continuous casting. Adopting measured heat flux as the boundary conditions, heat conduction in the mold is solved by the finite difference scheme, and dendritic growth is modeled by the cellular automaton model. The temperature distribution of the round billet under measured heat flux is calculated, and the grain structure and the microsegregation of carbon in four selected regions are simulated. Herein, it is shown in the results that the different local heat fluxes lead to dissimilar variations in the surface temperature and grain structure of the shell. A close relationship exists between the carbon microsegregation and local heat flux; the carbon microsegregation decreases with heat flux. The high heat flux accelerates columnar dendritic growth and fines the columnar dendritic array so that the secondary arms are less developed and the microsegregation is improved.

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Microsegregation Formation in Al–Cu Alloy under Action of Steady Magnetic Field

Cited by 8 publications

References 31 publications

Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy

Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy

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

Modeling of the Nonuniform Microstructure and Microsegregation Formation of the Shell in Round Billet Continuous Casting

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