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The Role of Electric Current-Associated Free Energy and Forced Convection on Grain Refinement in Pure Aluminum under Electropulsing
- Source :
- Materials, Volume 12, Issue 23, Materials, Vol 12, Iss 23, p 3846 (2019)
- Publication Year :
- 2019
- Publisher :
- MDPI AG, 2019.
-
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 (&Delta<br />Gem) and forced convection dominated the generation of fine equiaxed grains (FEG). Under electropulsing with 480 A, &Delta<br />Gem 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 &Delta<br />Gem 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 &Delta<br />Gem was presented to explain the formation mechanism of FEG in pure aluminum under electropulsing.
- Subjects :
- Equiaxed crystals
Materials science
chemistry.chemical_element
02 engineering and technology
lcsh:Technology
01 natural sciences
Article
Dissociation (chemistry)
pure aluminum
Aluminium
0103 physical sciences
General Materials Science
lcsh:Microscopy
lcsh:QC120-168.85
010302 applied physics
fine equiaxed grains
lcsh:QH201-278.5
lcsh:T
alternating electropulsing
021001 nanoscience & nanotechnology
Forced convection
chemistry
lcsh:TA1-2040
Chemical physics
Electrode
Metal mesh
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
solidification
Electric current
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
lcsh:TK1-9971
Subjects
Details
- ISSN :
- 19961944
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Materials
- Accession number :
- edsair.doi.dedup.....2cd2edefd0e663d0f1c31171147f7f53