Numerical and experimental studies on solidification of AZ80 magnesium alloy under out-of-phase pulsed magnetic field

Duan, Wenchao; Yin, Siqi; Liu, Wenhong; Zhao, Zhipeng; Hu, Kun; Wang, Ping; Chen, Jianzhong; Zhang, Zhiqiang

doi:10.1016/j.jma.2020.03.008

Cited by 19 publications

(3 citation statements)

References 51 publications

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“…The present observations for the rectangular slab mentioned above also verify this conclusion. OPMF is a newly developed MF recently used to overcome the problem of the lower forced convection by using a single PMF (Duan et al , 2021). As indicated before, For OPMF2, this larger downward component of Lorentz force is of great benefit to promote the motion of molten melt between the upper part and the lower part, accelerating the heat transfer between them.…”

Section: Resultsmentioning

confidence: 99%

Predicting the effect of different magnetic fields on the solute segregation during direct chill casting of large-size magnesium alloy slab

Duan

Yang

Liu

et al. 2023

HFF

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Purpose The purpose of this paper is to reveal the solute segregation behavior in the molten and solidified regions during direct chill (DC) casting of a large-size magnesium alloy slab under no magnetic field (NMF), harmonic magnetic field (HMF), pulsed magnetic field (PMF) and two types of out-of-phase pulsed magnetic field (OPMF). Design/methodology/approach A 3-D multiphysical coupling mathematical model is used to evaluate the corresponding physical fields. The coupling issue is addressed using the method of separating step and result inheritance. Findings The results suggest that the solute deficiency tends to occur in the central part, while the solute-enriched area appears near the fillet in the molten and solidified regions. Applying magnetic field could greatly homogenize the solute field in the two-phase region. The variance of relative segregation level in the solidified cross-section under NMF is 38.1%, while it is 21.9%, 18.6%, 16.4% and 12.4% under OPMF2 (the current phase in the upper coil is ahead of the lower coil), HMF, PMF and OPMF1 (the current phase in the upper coil lags behind the lower coil), respectively, indicating that OPMF1 is more effective to reduce the macrosegregation level. Originality/value There are few reports on the solute segregation degree in rectangle slab under magnetic field, especially for magnesium alloy slab. This paper can act a reference to make clear the solute transport behavior and help reduce the macrosegregation level during DC casting.

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Section: Resultsmentioning

confidence: 99%

Predicting the effect of different magnetic fields on the solute segregation during direct chill casting of large-size magnesium alloy slab

Duan

Yang

Liu

et al. 2023

HFF

Self Cite

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“…It is assumed that a nucleus α of radius r nucleates to form a spherical crown on base B, then, the heterogeneous nucleation diagram is shown in Fig. 11, where σ and A are the interfacial energy and area, respectively, and the total free energy (ΔG) can be expressed as [29] :…”

Section: Influence Of Different Refinement Methods On Alloy Nucleationmentioning

confidence: 99%

Effect of compound treatment of rotating magnetic field and Al-5Ti-1B refiner on microstructure and properties of Al-5Cu alloy

Wang

Kang

2023

China Foundry

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Al-Cu casting alloys have high strength, good machinability, and excellent heat resistance [1][2][3] . However, Al-Cu alloys usually contain coarse α-Al dendrites and inhomogeneous Al 2 Cu phases, resulting in poor mechanical properties [4,5] . Thus, grain refinement treatments are usually required to improve their microstructure and properties [6][7][8] . Chemical and physical methods are the main grain refining methods for Al alloys. The chemical refinement method, i.e., adding refiners into the alloy, is considered the most effective and practical in the Al processing industry owing to its advantages of fast refinement, convenient operation, and strong adaptability.

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“…The effective refinement of a solidification structure of as-cast magnesium alloys can improve both the strength and plasticity of the alloy, and the fluidity of liquid metal during solidification, inhibit porosity, and reduce the tendency of hot cracking and other casting defects [ 1 , 2 , 3 ]. For magnesium alloys without Al, Zr-containing refiners need to be added to the alloy melt to effectively refine the as-cast microstructure and grain size [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Atomic Mechanism for Grain Refinement of Magnesium Alloys by Mg-Zr Master Alloy

Zhang

Li²,

Li³

et al. 2022

Materials

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The valence electron structure, bond energy, and cohesive energy of Mg, Zr, and α-Mg containing Zr, and α-Zr containing Mg crystals were calculated using the empirical electron theory of solids and molecules (EET). The calculation results show that the bond and cohesive energies of Zr were much greater than those of Mg, so Zr particles could precipitate ahead of α-Mg in general magnesium alloy melts or insoluble Zr particles exist when the magnesium melt temperature is relatively low. The bond energy of α-Zr decreases with the increase in Mg content; therefore, at the end of the growth of Zr particles, the remaining Zr atoms in the melt exist in the form of Mg–Zr clusters. In order to reduce the surface energy of Zr particles, the outer surface of Zr particles tends to terminate with a Zr–Mg atomic layer, that is, a stable two-dimensional Zr–Mg atomic layer is formed first on the (0001) crystal surface of the outermost surface of Zr particles. Furthermore, on the basis of the calculated results, a complementary criterion to the edge-to-edge model of heterogeneous nucleation is also proposed. {ure and single Zr particles cannot become the heterogeneous nucleus of α-Mg, but when there is an atomic layer of two-dimensional Zr–Mg on its surface, the nucleation of particles can be activated. Mg atoms in the liquid phase preferentially attach to the Zr–Mg/Mg–Zr atomic layer on the surface of Zr particles to grow and form a stable ordered structure, which lastly transforms Zr particles into efficient heterogeneous cores.

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Numerical and experimental studies on solidification of AZ80 magnesium alloy under out-of-phase pulsed magnetic field

Cited by 19 publications

References 51 publications

Predicting the effect of different magnetic fields on the solute segregation during direct chill casting of large-size magnesium alloy slab

Predicting the effect of different magnetic fields on the solute segregation during direct chill casting of large-size magnesium alloy slab

Effect of compound treatment of rotating magnetic field and Al-5Ti-1B refiner on microstructure and properties of Al-5Cu alloy

Investigation on the Atomic Mechanism for Grain Refinement of Magnesium Alloys by Mg-Zr Master Alloy

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