The solidification of Al–Cu binary eutectic alloy with electric fields

Liu, Bing; Zhao, Zhongwei; Wang, Yongxin; Chen, Zheng

doi:10.1016/j.jcrysgro.2004.06.009

Cited by 20 publications

(7 citation statements)

References 14 publications

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“…For directionally solidified Al-Cu eutectic alloy, electric field increased the lamellar spacing and the number of laminates. [14] However, contrary results under DC of 1136 A cm À2 were obtained by Gu et al [15] Here, it should be pointed out that most of the attention has been paid to investigate the effect of current intensity on the microstructure modification of alloys, and the potential mechanism of current treatment appears to be inconsistent and controversial. Various explanations for current treatment have been proposed, such as the increase in the solid-liquid interfacial energy, [16] the suppression of grain growth due to Joule heating, [13] current crowding due to the differing electrical conductivities of solid and liquid, [2] electromigration, [10] melt flow caused by Lorentz force, [2] and the reduction in the nucleation activation energy.…”

Section: Introductionmentioning

confidence: 85%

Effect of Direct Current on Microstructure Evolution of Directionally Solidified Sn-70 wt pct Bi Alloy at Different Pulling Rates

Zhang

et al. 2015

Metall Mater Trans A

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The effect of direct current (DC) on the solidification behaviors of Sn-70 wt pct Bi alloy was studied using the directional solidification method. All the microstructures obtained at different pulling rates with DC treatment consisted of two typical structures, i.e., the transitional and steady ones. It was found that the transitional microstructures were two-phase structures under a positive DC, whose morphologies and the corresponding lengths of transitional zone were independent of the pulling rate. However, the transitional microstructures upon DC reversal, which were different from those under a positive DC, strongly depended on the pulling rate. The formation and difference of the transitional microstructures upon DC reversal were mainly attributed to Joule heating and concentration-dependent electromigration. The primary nubby Bi phase and dendritic b-Sn phase, caused by composition fluctuation due to the difference of Lorentz force subjected to Sn and Bi, precipitated in the steady zone regardless of the current polarity.

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Section: Introductionmentioning

confidence: 85%

Effect of Direct Current on Microstructure Evolution of Directionally Solidified Sn-70 wt pct Bi Alloy at Different Pulling Rates

Zhang

et al. 2015

Metall Mater Trans A

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“…Recently, DC of the order of 10 1–2 A cm –2 was applied to modify the microstructures of alloys. Liu et al 11 reported that electric fields increased the lamellar spacing and the number of laminates of directionally solidified Al–Cu eutectic alloy due to enhancement of atom diffusion in liquid. However, the lamellar spacing was decreased by DC of 1136 A cm –2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of medium-density direct current on dendrites of directionally solidified Pb–50Sn alloy

Zhang

et al. 2016

Materials Science and Technology

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This paper investigated the effect of coupling of direct current (DC) and pulling rate on dendrites and cooling behaviours of directionally solidified Pb–50Sn alloy. Experimental results indicated that the secondary dendritic arm spacing (SDAS) decreased and temperature gradient increased as increasing current densities. Moreover, temperature rise and SDAS under positive DC were higher than those under negative DC. It was speculated that Joule heating and electromigration were obviously induced by the present DC. The effect of DC on the microstructure and solidification parameters was weakened as the pulling rate increases. The coarsening rate reduced from tf1/3 toward a value of tf0.29 when DC of ±200 A cm–2 were applied. The refinement mechanism of SDAS was discussed.

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“…The experimental results show that external electric field can be used to control the alloy's microstructure. However, most of the observed phenomena were explained based merely on the influence of the electric field on the vacancies [5][6][7]. The influence of an electric field on thermodynamic properties has received minimal attention [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Electric Field on Aging Phase Transformation in Al-Zn-Mg-Cu Alloys

Li¹,

Xie²,

Chen³

et al. 2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

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The effect of electric fields on the aging phase transformation of Al-Zn-Mg-Cu alloys is investigated with the first-principles method combined with vacancy mechanism. The effects of external electric field with different direction on aging phase transformation and electron structure are analyzed. Results show that the Gibbs free energy of the η' phase exhibits different responses to the different external electric directions. The orientation precipitation of the η' phase can be activated during aging with an external electric field lower than 26MV/cm. The calculation of density of states provides an explanation for the different responses of the GP zones, η' and η phases to the external electric field. And a vacancy mechanism is proposed to explain the microstructural evolution during aging in an electric field.

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The solidification of Al–Cu binary eutectic alloy with electric fields

Cited by 20 publications

References 14 publications

Effect of Direct Current on Microstructure Evolution of Directionally Solidified Sn-70 wt pct Bi Alloy at Different Pulling Rates

Effect of Direct Current on Microstructure Evolution of Directionally Solidified Sn-70 wt pct Bi Alloy at Different Pulling Rates

Effect of medium-density direct current on dendrites of directionally solidified Pb–50Sn alloy

Effect of Electric Field on Aging Phase Transformation in Al-Zn-Mg-Cu Alloys

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