Electric Field Annealing on 3104 Aluminum Alloy Sheets: Evolution of Microstructure and Texture

2005 ◽  
Vol 105 ◽  
pp. 169-174 ◽  
Author(s):  
Zhuo Chao Hu ◽  
Yu Dong Zhang ◽  
X. Zhao ◽  
Liang Zuo ◽  
Claude Esling
Keyword(s):  
Aluminum Alloy ◽  
Electric Field ◽  
Texture Component ◽  
Cube Texture ◽  
Sample Surface ◽  
Stored Energy ◽  
Field Annealing ◽  
Cold Rolled ◽  
Evolution Of Microstructure

The cold-rolled 3104 aluminum alloy sheets were annealed without and with an electric field. Results show that the electric field can greatly postpone the recovery and recrystallization processes, enhance the Cube texture component. The effect of the electric field lies in that it decreases the concentration of the electronegative vacancies by attracting them to the electropositive sample surface, thus reducing the stored energy for recovery and recrystallization.

Effects of high magnetic field annealing on the initial recrystallized texture in pure copper

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540020 ◽  
Author(s):  
Tong He ◽  
Yan Wang ◽  
Wei Sun ◽  
Xiang Zhao
Keyword(s):  
Magnetic Field ◽  
Grain Boundaries ◽  
High Magnetic Field ◽  
Pure Copper ◽  
Cube Texture ◽  
Magnetic Annealing ◽  
Final Annealing ◽  
Field Annealing ◽  
Cold Rolled ◽  
The Magnetic Field

The cold-rolled pure copper sheets were annealed with and without a high magnetic field of 12 T. The results showed that the magnetic annealing could promote the formation of the initial recrystallized cube texture. The magnetic annealing did not dramatically change the final annealing textures, but the intensity of the recrystallized cube texture is obviously different. The differences of the recrystallized cube orientation intensity between the specimens with and without the field annealing may be attributed to the effects of the magnetic field on the mobility of grain boundaries.

Evolution of Annealing Textures and Microstructures in AA 3103 after Cold Rolling and Repeated Shear Deformation

2005 ◽  
Vol 475-479 ◽  
pp. 389-392 ◽  
Author(s):  
Moo Young Huh ◽  
J.P. Lee ◽  
Jae Chul Lee ◽  
Jong Woo Park ◽  
Young Hoon Chung
Keyword(s):  
Aluminum Alloy ◽  
Cold Rolling ◽  
Shear Deformation ◽  
Cube Texture ◽  
Rolled Sample ◽  
Hardness Level ◽  
Cold Rolled

The evolution of annealing textures and microstructures in the aluminum alloy 3103, which was subjected to deformation by either cold rolling or equal channel angular rolling (ECAR), was investigated. Samples of AA 3103 sheets were repeatedly deformed by ECAR up to six passes. In addition, AA 3103 was cold rolled to the same hardness level of the ECARed samples. Upon annealing, the cold rolled sample was recrystallized by the discontinuous recrystallization which gave rise to the formation of the cube texture and large grains bigger than 30 µm. In contrast, the ECARed sample was recrystallized by extended recovery which led to the formation of ultra-fine grains having a size smaller than 3.5 µm.

Effect of Magnetic Field Direction on Texture Evolution in Cold-Rolled IF Steel Sheet at the Initial Stage of Recrystallization

2011 ◽  
Vol 194-196 ◽  
pp. 75-79
Author(s):  
Yan Wu ◽  
Xiang Zhao ◽  
Chang Shu He ◽  
Liang Zuo
Keyword(s):  
Magnetic Field ◽  
Texture Component ◽  
Field Direction ◽  
Magnetic Field Direction ◽  
If Steel ◽  
Initial Stage ◽  
Field Annealing ◽  
Specimen Orientation ◽  
Cold Rolled ◽  
The Magnetic Field

Sheets of cold rolled (76%) IF steel were annealed at 650°C for 30min under a 12-tesla magnetic field. During the magnetic field annealing, they were placed at the center of the applied field respectively, being oriented differently with respect to the magnetic field direction. The results show that the high magnetic field annealing prevents the evolution from deformed {111}<110> texture component to recrystallized {111}<112> texture component at the initial stage of recrystallization. For the field annealed specimens, altering the specimen orientation to the magnetic field direction during annealing does not change the final annealing textures. The intensity of main {111} texture components presents a similar periodic variation with respect to the specimen orientation to the magnetic field.

Anomalous Rolling and Annealing Textures of Cold Rolled Copper Foils

2007 ◽  
Vol 558-559 ◽  
pp. 229-234 ◽  
Author(s):  
Su Hyeon Kim ◽  
Seung Zeon Han ◽  
Chang Joo Kim ◽  
Soon Young Ok ◽  
In Youb Hwang ◽  
...  
Keyword(s):  
Grain Size ◽  
Texture Component ◽  
Recrystallization Texture ◽  
Rolling Direction ◽  
Cube Texture ◽  
Rolling Texture ◽  
Fiber Texture ◽  
Low Intensity ◽  
Copper Foils ◽  
Cold Rolled

Copper foils cold rolled up to 92% reduction exhibited a low intensity of the β-fiber texture and a high intensity of the cube and RD (rolling direction)-rotated cube components. After annealing, the recrystallization texture of the foils could be characterized by the mixture of the cube and the S components. An initial strong cube texture with a large grain size might remain a less developed rolling texture component, cube or RD-rotated cube, which would be the source of the S component in the recrystallization texture.

Reinforcement of the Cube texture during recrystallization of a 1050 aluminum alloy partially recrystallized and 10% cold-rolled

2012 ◽  
Vol 64 ◽  
pp. 1-7 ◽  
Author(s):  
Wei Wang ◽  
Anne-Laure Helbert ◽  
Thierry Baudin ◽  
François Brisset ◽  
Richard Penelle
Keyword(s):  
Aluminum Alloy ◽  
Cube Texture ◽  
Cold Rolled ◽  
1050 Aluminum Alloy

Effect of an Electric Field on the Texture and Microstructure Evolution during Annealing of High Reduction Cold-Rolled Ni

2007 ◽  
Vol 353-358 ◽  
pp. 679-682
Author(s):  
Xiao Ling Li ◽  
Wei Liu ◽  
Andrew Godfrey ◽  
Qing Liu
Keyword(s):  
Electric Field ◽  
Twin Boundary ◽  
Microstructure Evolution ◽  
High Purity ◽  
Cube Texture ◽  
Electron Backscattering ◽  
Grain Sizes ◽  
Boundary Length ◽  
High Reduction ◽  
Cold Rolled

The influence of an electric field on the annealing of high purity (99.999%) cold rolled nickel has been investigated. Annealing was carried out for 2 hours at temperatures between 300oC and 800oC with and without an electric field of strength 2.0KVcm-1. The microstructure and fraction of cube texture resulting were characterized using electron backscattering pattern (EBSP) technique. Annealing in an electric field leads to somewhat smaller average values of the cube fraction and grain sizes compared to annealing without an electric field. The highest temperature (800oC) annealing in an electric field results in microstructures with a lower fractional twin boundary length.

scholarly journals Effect of CO Molecule Orientation on the Reduction of Cu-Based Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 279
Author(s):  
Sergey Y. Sarvadii ◽  
Andrey K. Gatin ◽  
Vasiliy A. Kharitonov ◽  
Nadezhda V. Dokhlikova ◽  
Sergey A. Ozerin ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Adsorption Process ◽  
Co Adsorption ◽  
Reduction Rate ◽  
Sample Surface ◽  
Potential Difference ◽  
Precipitation Method ◽  
Scanning Tunneling ◽  
Tunneling Microscopy

The adsorption of CO on the surface of Cu-based nanoparticles was studied in the presence of an external electric field by means of scanning tunneling microscopy (STM) and spectroscopy (STS). Nanoparticles were synthesized on the surface of a graphite support by the impregnation–precipitation method. The chemical composition of the surface of the nanoparticles was determined as a mixture of Cu2O, Cu4O3 and CuO oxides. CO was adsorbed from the gas phase onto the surface of the nanoparticles. During the adsorption process, the potential differences ΔV = +1 or −1 V were applied to the vacuum gap between the sample and the grounded tip. Thus, the system of the STM tip and sample surface formed an asymmetric capacitor, inside which an inhomogeneous electric field existed. The CO adsorption process is accompanied by the partial reduction of nanoparticles. Due to the orientation of the CO molecule in the electric field, the reduction was weak in the case of a positive potential difference, while in the case of a negative potential difference, the reduction rate increased significantly. The ability to control the adsorption process of CO by means of an external electric field was demonstrated. The size of the nanoparticle was shown to be the key factor affecting the adsorption process, and particularly, the strength of the local electric field close to the nanoparticle surface.

Effects of Space Charge on ESEM Gas Amplification

1997 ◽  
Vol 3 (S2) ◽  
pp. 609-610 ◽  
Author(s):  
B.L. Thiel ◽  
M.R. Hussein-Ismail ◽  
A.M. Donald
Keyword(s):  
Electric Field ◽  
Electrostatic Field ◽  
Secondary Electron ◽  
Sample Surface ◽  
Cascade Process ◽  
Secondary Electrons ◽  
Positive Ions ◽  
Space Charges ◽  
Cascade Amplification ◽  
Environmental Sem

We have performed a theoretical investigation of the effects of space charges in the Environmental SEM (ESEM). The ElectroScan ESEM uses an electrostatic field to cause gas cascade amplification of secondary electron signals. Previous theoretical descriptions of the gas cascade process in the ESEM have assumed that distortion of the electric field due to space charges can be neglected. This assumption has now been tested and shown to be valid.In the ElectroScan ESEM, a positively biased detector is located above the sample, creating an electric field on the order of 105 V/m between the detector and sample surface. Secondary electrons leaving the sample are cascaded though the gas, amplifying the signal and creating positive ions. Because the electrons move very quickly through the gas, they do not accumulate in the specimen-to-detector gap. However, the velocity of the positive ions is limited by diffusion.

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