A Transmission Electron Microscope and Atom-probe Tomographic Study of the Microstructure of a Ni-Mo Based "Hastelloy" Alloy after 10 MeV Electron Irradiation

2006 ◽  
Author(s):  
N. Wanderka ◽  
A. Bakai ◽  
C. Abromeit ◽  
D. Isheim ◽  
D. Seidman
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Electron Irradiation ◽  
Atom Probe ◽  
Transmission Electron

Crystalline to Amorphous Transformation of Fe3B By 1 MeV Electron Irradiation

1981 ◽  
Vol 7 ◽  
Author(s):  
A. Mogro-Campero ◽  
E.L. Hall ◽  
J.L. Walter ◽  
A.J. Ratkowski
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Electron Irradiation ◽  
Room Temperature ◽  
Ion Irradiation ◽  
Rapid Quenching ◽  
Al Alloy ◽  
Bright Field ◽  
Transmission Electron ◽  
Diffraction Patterns

ABSTRACTSpecimens of amorphous Fe75B25 produced by rapid quenching from the melt were annealed to complete crystallization and subjected to 1 MeV electron irradiation in a transmission electron microscope at room temperature and at 130 K. The irradiation was interrupted at various intervals in order to obtain bright field images and diffraction patterns. The Fe3B crystals did not become amorphous at room temperature, even after damage levels of several dpa, whereas at 130 K the crystalline to amorphous transformation was observed to be complete at damage levels below 1 dpa. The results are combined with those of ion irradiation work on Fe3B; qualitative agreement is found between Fe3B and previous work on the Zr3Al alloy concerning their response to displacement damage by electron and ion irradiation.

A Hvem Study of the Electron Irradiated Defects in Nitrogen Doped FZ-Si Single Crystal

1989 ◽  
Vol 163 ◽  
Author(s):  
Gao Yuzun ◽  
T. Takeyama
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Electron Irradiation ◽  
Defect Density ◽  
Migration Energy ◽  
Nitrogen Doped ◽  
Temperature Range ◽  
Transmission Electron ◽  
Excellent Property ◽  
P Type

AbstractHigh voltage transmission electron microscope (JEM-1000) has been used to investigate the electron irradiated defects in in p-type FZ-Si and nitrogen doped p-type FZ-Si. It was found that when the irradiated conditions were the saie ,the irradiated defects were easier to be produced in the FZ-Si than in nitrogen doped FZ-Si in the temperature range 573-773 K. The defect density was higher in the foraer. The migration energy of the vacancies in the temperature range 573-773 K was 0.34 and 0.58 eV for FZ-Si and nitrogen doped FZ-Si respectively. It seems to indicate that there was some interaction between vacancies and nitrogen atoms in the nitrogen doped FZ-Si. The results proved that the nitrogen doped FZ-Si has excellent property against electron irradiation.

Microstructural Evolution of Ba2Ycu3O7 Superconductor by Electron Irradiation in a Transmission Electron Microscope

1989 ◽  
Vol 169 ◽  
Author(s):  
Kensuke ShiraiShi ◽  
Hiroshi Itoh
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Electron Irradiation ◽  
Early Stage ◽  
Lattice Image ◽  
Density Region ◽  
Transmission Electron ◽  
High Density Region ◽  
Intense Electron Beam ◽  
Intense Electron

AbstractMicrostructural changes in a Ba2YCu3O7 pellet were continuously observed during electron irradiation in a transmission electron microscope operating at 200 kV. Twin lamellae of 2~10 nm in thickness with 1~50 nm spacings were seen parallel to the lattice image of (001) plane with 1.17 nm in lattice spacing. The tip of the twin was lenticular and the (001) lattice fringes were distorted around the tip. Upon intense electron beam illumination, the lamellae faded at the tip and the thickness gradually decreased which increased the spacing in the high density region. Defect clusters of about 10 nm in size were produced in the very early stage of electron illumination.

Induced Amorphization in Pyrographite by Radiation Using High Voltage Transmission Electron Microscope

2011 ◽  
Vol 284-286 ◽  
pp. 2026-2036 ◽  
Author(s):  
Pedro Alejandro Tamayo Meza ◽  
Pablo Schabes Retchkiman ◽  
Luis Armando Flores Herrera ◽  
Viacheslav A. Yermishkin ◽  
Carlos F. Ordáz Yañez ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
High Voltage ◽  
Electron Irradiation ◽  
High Dose ◽  
Natural Graphite ◽  
Transmission Electron ◽  
High Voltage Transmission ◽  
Vacancy Concentrations

A high dose of electron irradiation generates amorphous zones with critical vacancy concentrations in the pyrographite. The degree of disorder “” of amorphization of Graphite, natural graphite, pyrographite and polycrystal pyrographite are analyzed as a function of time “t”, and the amorphization kinetics under different voltages inside the HVTEM.

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