The role of electric current-associated free energy and forced convection on grain refinement in pure aluminum under electropulsing

Ning Li; Limin Zhang; Rong Zhang; Pengfei Yin; Hongjing Wu; Kaikai Song; Hui Xing

doi:10.3390/ma122333846

The role of electric current-associated free energy and forced convection on grain refinement in pure aluminum under electropulsing

Ning Li, Limin Zhang, Rong Zhang, Pengfei Yin, Hongjing Wu, Kaikai Song, Hui Xing

School of Physical Science and Technology

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

An experimental study with respect to the effect of an alternating electropulsing on grain refinement in pure aluminum was reported. The macrostructural observation with the mold preheated to different temperature and embedded the metal mesh indicated that the change of electric current-associated free energy related with the position of crystal nuclei (ΔG_em) and forced convection dominated the generation of fine equiaxed grains (FEG). Under electropulsing with 480 A, ΔG_em induced the dissociation of crystal nuclei from the upper interface of the electrode and the melt, leading to the generation of FEG. For a larger current intensity, FEG originated from the dissociation of crystal nuclei on the side wall besides the upper interface due to ΔG_em and the forced convection. Furthermore, the model coupling the dissociation of crystal nuclei and dendrite fragmentation due to the forced convection and the dissociation of crystal nuclei due to ΔG_em was presented to explain the formation mechanism of FEG in pure aluminum under electropulsing.

Original language	English
Article number	3846
Journal	Materials
Volume	12
Issue number	23
DOIs	https://doi.org/10.3390/ma122333846
State	Published - 1 Dec 2019

Keywords

Alternating electropulsing
Fine equiaxed grains
Pure aluminum
Solidification

Access to Document

10.3390/ma122333846

Cite this

@article{c83daeaa6bd7432886626a384454458c,

title = "The role of electric current-associated free energy and forced convection on grain refinement in pure aluminum under electropulsing",

abstract = "An experimental study with respect to the effect of an alternating electropulsing on grain refinement in pure aluminum was reported. The macrostructural observation with the mold preheated to different temperature and embedded the metal mesh indicated that the change of electric current-associated free energy related with the position of crystal nuclei (ΔGem) and forced convection dominated the generation of fine equiaxed grains (FEG). Under electropulsing with 480 A, ΔGem induced the dissociation of crystal nuclei from the upper interface of the electrode and the melt, leading to the generation of FEG. For a larger current intensity, FEG originated from the dissociation of crystal nuclei on the side wall besides the upper interface due to ΔGem and the forced convection. Furthermore, the model coupling the dissociation of crystal nuclei and dendrite fragmentation due to the forced convection and the dissociation of crystal nuclei due to ΔGem was presented to explain the formation mechanism of FEG in pure aluminum under electropulsing.",

keywords = "Alternating electropulsing, Fine equiaxed grains, Pure aluminum, Solidification",

author = "Ning Li and Limin Zhang and Rong Zhang and Pengfei Yin and Hongjing Wu and Kaikai Song and Hui Xing",

note = "Publisher Copyright: {\textcopyright} 2019 by the authors.",

year = "2019",

month = dec,

day = "1",

doi = "10.3390/ma122333846",

language = "英语",

volume = "12",

journal = "Materials",

issn = "1996-1944",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "23",

}

TY - JOUR

T1 - The role of electric current-associated free energy and forced convection on grain refinement in pure aluminum under electropulsing

AU - Li, Ning

AU - Zhang, Limin

AU - Zhang, Rong

AU - Yin, Pengfei

AU - Wu, Hongjing

AU - Song, Kaikai

AU - Xing, Hui

PY - 2019/12/1

Y1 - 2019/12/1

N2 - An experimental study with respect to the effect of an alternating electropulsing on grain refinement in pure aluminum was reported. The macrostructural observation with the mold preheated to different temperature and embedded the metal mesh indicated that the change of electric current-associated free energy related with the position of crystal nuclei (ΔGem) and forced convection dominated the generation of fine equiaxed grains (FEG). Under electropulsing with 480 A, ΔGem induced the dissociation of crystal nuclei from the upper interface of the electrode and the melt, leading to the generation of FEG. For a larger current intensity, FEG originated from the dissociation of crystal nuclei on the side wall besides the upper interface due to ΔGem and the forced convection. Furthermore, the model coupling the dissociation of crystal nuclei and dendrite fragmentation due to the forced convection and the dissociation of crystal nuclei due to ΔGem was presented to explain the formation mechanism of FEG in pure aluminum under electropulsing.

AB - An experimental study with respect to the effect of an alternating electropulsing on grain refinement in pure aluminum was reported. The macrostructural observation with the mold preheated to different temperature and embedded the metal mesh indicated that the change of electric current-associated free energy related with the position of crystal nuclei (ΔGem) and forced convection dominated the generation of fine equiaxed grains (FEG). Under electropulsing with 480 A, ΔGem induced the dissociation of crystal nuclei from the upper interface of the electrode and the melt, leading to the generation of FEG. For a larger current intensity, FEG originated from the dissociation of crystal nuclei on the side wall besides the upper interface due to ΔGem and the forced convection. Furthermore, the model coupling the dissociation of crystal nuclei and dendrite fragmentation due to the forced convection and the dissociation of crystal nuclei due to ΔGem was presented to explain the formation mechanism of FEG in pure aluminum under electropulsing.

KW - Alternating electropulsing

KW - Fine equiaxed grains

KW - Pure aluminum

KW - Solidification

UR - http://www.scopus.com/inward/record.url?scp=85075886043&partnerID=8YFLogxK

U2 - 10.3390/ma122333846

DO - 10.3390/ma122333846

M3 - 文章

AN - SCOPUS:85075886043

SN - 1996-1944

VL - 12

JO - Materials

JF - Materials

IS - 23

M1 - 3846

ER -

The role of electric current-associated free energy and forced convection on grain refinement in pure aluminum under electropulsing

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this