The Influence of Electron Beam Treatment on Al-Si Alloy Structure Destroyed at High-Cycle Fatigue

2016 ◽  
Vol 675-676 ◽  
pp. 655-659 ◽  
Author(s):  
Sergey V. Konovalov ◽  
Krestina Aksenova ◽  
Victor Gromov ◽  
Yurii F. Ivanov ◽  
Olga Semina
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
High Cycle Fatigue ◽  
Fatigue Loading ◽  
Electron Beam Treatment ◽  
Electron Beam Processing ◽  
Transmission Electron ◽  
Microscopy Method ◽  
Diffraction Microscopy ◽  
Electron Diffraction Microscopy

By scanning and transmission electron diffraction microscopy method the analysis of structure-phase states and defect substructure of silumin subjected to high-intensity electron beam irradiation in various regimes and subsequent fatigue loading up to failure was carried out. It is revealed that the sources of fatigue microcracks are silicon plates of micron and submicron sizes that are not soluble in electron beam processing. The possible reasons of the silumin fatigue life increase under electron-beam treatment are discussed.

Methods to Monitor and Improve the Performance of Specimen Holders for Transmission Electron Cryomicroscopy

1996 ◽  
Vol 54 ◽  
pp. 454-455
Author(s):  
B. L. Armbruster ◽  
B. Kraus ◽  
M. Pan
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Beam Irradiation ◽  
Quality Of Data ◽  
Electron Cryomicroscopy ◽  
Thermal Equilibration ◽  
Transmission Electron ◽  
Electron Microscopes

One goal in electron microscopy of biological specimens is to improve the quality of data to equal the resolution capabilities of modem transmission electron microscopes. Radiation damage and beam- induced movement caused by charging of the sample, low image contrast at high resolution, and sensitivity to external vibration and drift in side entry specimen holders limit the effective resolution one can achieve. Several methods have been developed to address these limitations: cryomethods are widely employed to preserve and stabilize specimens against some of the adverse effects of the vacuum and electron beam irradiation, spot-scan imaging reduces charging and associated beam-induced movement, and energy-filtered imaging removes the “fog” caused by inelastic scattering of electrons which is particularly pronounced in thick specimens.Although most cryoholders can easily achieve a 3.4Å resolution specification, information perpendicular to the goniometer axis may be degraded due to vibration. Absolute drift after mechanical and thermal equilibration as well as drift after movement of a holder may cause loss of resolution in any direction.

Factors Influencing SO2 Removal Efficiency by Electron Beam Processing of Coal-Fired Flue Gas Treatment

1998 ◽  
Vol 9 (5) ◽  
pp. 535-547 ◽  
Author(s):  
Ryunosuke Kikuchi
Keyword(s):  
Electron Beam ◽  
Flue Gas ◽  
Electron Beam Irradiation ◽  
Gas Treatment ◽  
So2 Removal ◽  
Electron Beam Processing ◽  
Scale Test ◽  
Sulphate Salts ◽  
Flue Gas Treatment ◽  
Bench Scale Test

A bench-scale test (800 Nm3/h) for electron beam treatment of flue gas was conducted. It was concluded that the method is favourable for treatment of flue gas with a high SO2 concentration (5,500 ppm) at low electron beam irradiation (5 kGy). Results are consistent with the claim that SOx is removed from flue gas by the reaction of SOx with ammonia, and the intermediate salts formed are oxidised by radicals to sulphate salts consisting mainly of ammonium sulphate (a N-fertiliser). A typical flue gas desulphurization (FGD) method such as the wet limestone process cannot remove NOx and SO3 effectively (Ando, 1990), but the electron beam process removes SO2, SO3 and NOx simultaneously without generating waste water and CO2.

Modification of Polylactic Acid/ Halloysite Bionanocomposites Using Electron Beam Radiation: Physical, Barrier and Thermal Properties

2020 ◽  
Vol 1002 ◽  
pp. 57-65
Author(s):  
Abdulkader M. Alakrach ◽  
Nik Noriman Zulkepli ◽  
Awad A. Al-Rashdi ◽  
Sam Sung Ting ◽  
Rosniza Hamzah ◽  
...  
Keyword(s):  
Electron Beam ◽  
Polylactic Acid ◽  
Food Packaging ◽  
Electron Beam Irradiation ◽  
Casting Process ◽  
Barrier Properties ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Electron Beam Processing ◽  
The Impact

This study aimed to develop novel Polylactic acid/ Halloysite (PLA/ HNTs) films which showed better properties when they were used for food packaging. They also displayed better mechanical, barrier, morphological and structural properties when the researchers analysed the impact of the electron beam irradiation on the nanomaterials. They prepared PLA-based nanocomposites containing 5 % w/w of HNTs using the solution casting process. These nanocomposites were further exposed to different ebeam doses (i.e., 0, 20, 40 and 60 kGy). The researchers assessed the effect of the electron beam irradiation on the various properties of the PLA. All the composites showed a homogenous dispersion and distribution of the HNTs in this PLA matrix. Results indicated that the nanocomposites showed better barrier properties in comparison to the neat PLA. Furthermore, the ebeam irradiation could increase the glass-transition temperature and lead to the development of more crosslinks, which increased the degradation temperature and hydrophilicity of the nanocomposites. In this study, the researchers showed that the PLA/HNTs films were effective materials that could be used for the electron beam processing of the pre-packed foods. The best effect was noted for the 20 kGy dosage which was used in the study.

Coalescence between Au nanoparticles as induced by nanocurvature effect and electron beam athermal activation effect

Nanoscale ◽  
2018 ◽  
Vol 10 (17) ◽  
pp. 7978-7983 ◽  
Author(s):  
Liang Cheng ◽  
Xianfang Zhu ◽  
Jiangbin Su
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Room Temperature ◽  
Electron Beam Irradiation ◽  
Au Nanoparticles ◽  
Beam Irradiation ◽  
Activation Effect ◽  
Transmission Electron

The coalescence of two single-crystalline Au nanoparticles on surface of amorphous SiOxnanowire, as induced by electron beam irradiation, wasin situstudied at room temperature in a transmission electron microscope.

Processing of Polypropylene by Low-Energy Pulsed Electron Beam from Forevacuum Plasma Source

2016 ◽  
Vol 683 ◽  
pp. 95-99 ◽  
Author(s):  
Victor Burdovitsin ◽  
Andrey Kazakov ◽  
Alexandr Medovnik ◽  
Efim Oks ◽  
Irina Puhova ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Plasma Source ◽  
Beam Current ◽  
Beam Current Density ◽  
Pulsed Electron Beam ◽  
Force Microscopy ◽  
Electron Beam Processing ◽  
Atomic Force ◽  
Energy Flux Density

Influence of electron beam irradiation on the morphology and contact angle of polypropylene was investigated. Electron beam processing was carried out at 8 – 10 kV accelerating voltage and a pressure of 5 – 10 Pa. Beam current density was up to 4.5 A/cm2, and the pulse duration - from 150 to 300 μs. The morphology of irradiated polymer material was studied by scanning-electron and atomic-force microscopy methods. It was established formation of extended equally oriented “hills” divided by “valleys”. The height of hills increases with the growth of energy flux density per pulse.

Analytical TEM Observation of Gold Nano-Particles on Cerium Oxide

2005 ◽  
Vol 900 ◽  
Author(s):  
Tomoki Akita ◽  
Koji Tanaka ◽  
Masanori Kohyama ◽  
Masatake Haruta
Keyword(s):  
Electron Beam ◽  
Cerium Oxide ◽  
Electron Beam Irradiation ◽  
Shape Change ◽  
Atomic Layer ◽  
Nano Particles ◽  
Beam Irradiation ◽  
Strong Electron ◽  
Transmission Electron ◽  
Strong Electron Beam

ABSTRACTThe structure of Au nano-particles supported on CeO2 was investigated by using an analytical transmission electron microscope (TEM). The shape change of Au particles was observed during TEM observation, such as shrinking down to a mono-atomic layer on the CeO2 substrate. The electron beam irradiation experiment revealed that the shape change of Au particles is concerning with the oxidation state or the density of oxygen vacancies of CeO2 substrate where the rapid desorption and adsorption of oxygen occurs. It was also found that the reduction by strong electron beam irradiation and subsequent oxidation generate the decoration of Au particles by cerium oxide.

Electron Beam Irradiated Effects of SiO2 in Stem

1994 ◽  
Vol 373 ◽  
Author(s):  
Tan-Chen Lee ◽  
John Silcox
Keyword(s):  
Electron Beam ◽  
Scanning Transmission Electron Microscopy ◽  
Electron Beam Irradiation ◽  
Dark Field ◽  
Formation Mechanisms ◽  
Plasmon Energy ◽  
Oxygen Loss ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Annular Dark Field

AbstractElectron beam irradiation effects in SiO2 have been studied by STEM (Scanning Transmission Electron Microscopy). Oxygen loss and the corresponding transformation from SiO2 to Si in SiO2 are confirmed and consistent with previous reports 1,2. A “flower-like” Si rich area, which might not be observed in STEM BF (Bright Field) or ADF (Annular Dark Field) images, was found in Si plasmon energy filtered images. Quantification of the observations and the formation mechanisms leading to the Si-rich area are discussed.

scholarly journals Thermoelectric Performance of Polypropylene/Carbon Nanotube/Ionic Liquid Composites and Its Dependence on Electron Beam Irradiation

2022 ◽  
Vol 6 (1) ◽  
pp. 25
Author(s):  
Oliver Voigt ◽  
Beate Krause ◽  
Petra Pötschke ◽  
Michael T. Müller ◽  
Sven Wießner
Keyword(s):  
Electron Beam ◽  
Seebeck Coefficient ◽  
Electron Beam Irradiation ◽  
Single Walled Carbon Nanotubes ◽  
Electron Beam Treatment ◽  
Beam Irradiation ◽  
Seebeck Coefficients ◽  
Treated Sample ◽  
P Type ◽  
Walled Carbon Nanotubes

The thermoelectric behavior of polypropylene (PP) based nanocomposites containing single walled carbon nanotubes (SWCNTs) and five kinds of ionic liquids (Ils) dependent on composite composition and electron beam irradiation (EB) was studied. Therefore, several samples were melt-mixed in a micro compounder, while five Ils with sufficiently different anions and/or cations were incorporated into the PP/SWCNT composites followed by an EB treatment for selected composites. Extensive investigations were carried out considering the electrical, thermal, mechanical, rheological, morphological and, most significantly, thermoelectric properties. It was found that it is possible to prepare n-type melt-mixed polymer composites from p-type commercial SWCNTs with relatively high Seebeck coefficients when adding four of the selected Ils. The highest Seebeck coefficients achieved in this study were +49.3 µV/K (PP/2 wt.% SWCNT) for p-type composites and −27.6 µV/K (PP/2 wt.% SWCNT/4 wt.% IL type AMIM Cl) for n-type composites. Generally, the type of IL is decisive whether p- or n-type thermoelectric behavior is achieved. After IL addition higher volume conductivity could be reached. Electron beam treatment of PP/SWCNT leads to increased values of the Seebeck coefficient, whereas the EB treated sample with IL (AMIM Cl) shows a less negative Seebeck coefficient value.

Sign in / Sign up

Export Citation Format

Share Document