Refinement of Primary and Eutectic Silicon Particles in Hypereutectic Al-Si Alloys Using an Applied Electric Potential

2013 ◽  
pp. 219-227
Author(s):  
A. Plotkowski ◽  
P. N. Anyalebechi
Keyword(s):  
Electric Potential ◽  
Eutectic Silicon ◽  
Applied Electric Potential ◽  
Silicon Particles

Oxygen Exchange in La0.6Sr0.4Co0.2Fe0.8O3−δThin-Film Heterostructures under Applied Electric Potential

2015 ◽  
Vol 119 (34) ◽  
pp. 19915-19921 ◽  
Author(s):  
E. Mitchell Hopper ◽  
Edith Perret ◽  
Brian J. Ingram ◽  
Hoydoo You ◽  
Kee-Chul Chang ◽  
...  
Keyword(s):  
Electric Potential ◽  
Oxygen Exchange ◽  
Applied Electric Potential

scholarly journals Effect of Sr-P Interaction on the Microstructure and Tensile Properties of A413.0 Type Alloys

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
A. M. Samuel ◽  
H. W. Doty ◽  
S. Valtierra ◽  
F. H. Samuel
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
Solution Heat Treatment ◽  
Eutectic Silicon ◽  
Low Magnesium ◽  
The Third ◽  
Wide Range ◽  
Eutectic Si ◽  
Second Peak ◽  
Silicon Particles

The present study was performed on low magnesium A413.0 type alloys. The results show that strontium (Sr) is mainly concentrated in the silicon particles. Overmodification occurs when Sr precipitates in the form of Al2SrSi2, which takes place over a wide range of temperatures. The first peak occurs following the precipitation ofα-Al, the second peak is merged with the precipitation of eutectic silicon (Si), and the third peak is a posteutectic reaction. Introduction of phosphorus (P) to Sr-modified alloys leads to the formation of (Al,P,Sr)2O5compound, which reduces the modification effectiveness of Sr. Therefore, in the presence of P, the amount of added Sr should exceed 200 ppm. For the same levels of P, the tensile parameters of well modified alloys (233 ppm Sr) are relatively higher than those partially modified with Sr (about 60 ppm Sr) containing the same amount of P. During solution heat treatment, coarsening of the eutectic Si particles occurs by the growth of some particles at the expense of the dissolution of the smaller ones, as well as by the collision of nearby particles.

An Erda Study on Proton Migration Induced by Electric Potential in SrZrO3,SrCeO3 and BaCeO3 Oxides:Measurements of Proton Transport Number and Proton Diffusivity

1998 ◽  
Vol 513 ◽  
Author(s):  
A. Kunimatsu ◽  
T. Arai ◽  
K. Takahiro ◽  
S. Nagata ◽  
S. Yamaguchi ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Cathode Material ◽  
Electric Potential ◽  
Proton Transport ◽  
Transport Number ◽  
Proton Concentration ◽  
Good Ability ◽  
Proton Migration ◽  
Dc Current ◽  
Applied Electric Potential

ABSTRACTMigration of protons dissolved in acceptor doped SrZrO3, SrCeO3 and BaCeO3 oxides has been examined under an applied electric potential over a range of temperature from 25 to 220°C. Protons which dissolved in these oxides migrated to the cathode, and they were trapped there when the cathode material had a good ability to getter the migrating hydrogen. The amount of hydrogen accumulated in the cathode could be measured by the ERDA method using a highenergy 4He beam. We measured the amount of hydrogen in the cathode while monitoring the dc current passed through the oxide specimen. The proton transport number was determined from the ratio of the number of hydrogen in the cathode to the total numbers of charge through the specimen. The diffusion coefficient of proton was evaluated using the proton transport number and proton concentration in the specimen.

Electrokinetic Transport in Micro-Nanofluidic Systems With Sudden-Expansion and Contraction Cross Sections

2009 ◽  
Author(s):  
Reiyu Chein ◽  
Baogan Chung
Keyword(s):  
Cross Sections ◽  
Electric Potential ◽  
Vortex Flow ◽  
Stokes Equations ◽  
Limiting Current ◽  
Sudden Expansion ◽  
Positive Pressure ◽  
Electrokinetic Transport ◽  
Nanofluidic System ◽  
Applied Electric Potential

In this study, electrokinetic transport in a micro-nanofluidic system is numerically investigated by solving the transient Poisson, Nernst-Planck, and Navier-Stokes equations simultaneously. The system considered is a nanochannel connected with two microchannels at its ends. Under various applied electric potential biases, the effect of concentration polarization on the fluid flow, induced pressure and electric current is examined. By comparing with the Donnan equilibrium condition and electroosmotic flow in microscale dimension, electric body force due to non-zero charge density is the mechanism for producing vortex flow and inducing positive pressure gradient in the anodic side of the system. The diffusive boundary layer thickness is reduced due to the stirring of the generated vortex flow and results in the over-limiting current when the applied electric potential bias is high.

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