Influence of Pb impurities on He-bubble formation and growth in Al studied by positron annihilation and transmission electron microscopy

1992 ◽  
Vol 46 (1) ◽  
pp. 69-75 ◽  
Author(s):  
S. G. Usmar ◽  
R. N. Wright
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Positron Annihilation ◽  
Bubble Formation ◽  
Transmission Electron

A Transmission Electron Microscopy Study of the Effect of Interfaces on Bubble Formation in He-Implanted Cu-Nb Multilayers

2012 ◽  
Vol 18 (1) ◽  
pp. 152-161 ◽  
Author(s):  
D. Bhattacharyya ◽  
M.J. Demkowicz ◽  
Y.-Q. Wang ◽  
R.E. Baumer ◽  
M. Nastasi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Layer Thickness ◽  
Bubble Diameter ◽  
Bubble Formation ◽  
Nuclear Reaction Analysis ◽  
Cross Sectional ◽  
Helium Bubbles ◽  
Transmission Electron ◽  
Pure Cu

AbstractMagnetron sputtered thin films of Cu, Nb, and Cu-Nb multilayers with 2.5 and 5 nm nominal layer thickness were deposited on Si and implanted with 4He+ and 3He+ ions. Secondary ion mass spectroscopy and nuclear reaction analysis, respectively, were used to measure the 4He+ and 3He+ concentration profile with depth inside the films. Cross-sectional transmission electron microscopy was used to characterize the helium bubbles. Analysis of the contrast from helium bubbles in defocused transmission electron microscope images showed a minimum bubble diameter of 1.25 nm. While pure Cu and Nb films showed bubble contrast over the entire range of helium implantation, the multilayers exhibited bubbles only above a critical He concentration that increased almost linearly with decreasing layer thickness. The work shows that large amounts of helium can be trapped at incoherent interfaces in the form of stable, nanometer-size bubbles.

scholarly journals Structure of Rapidly Solidified Al-Fe-Cr-Ce Alloy

2011 ◽  
Vol 465 ◽  
pp. 199-202 ◽  
Author(s):  
Alena Michalcová ◽  
Dalibor Vojtěch ◽  
Pavel Novák ◽  
Ivan Procházka ◽  
Jakub Čížek ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Positron Annihilation ◽  
Melt Spinning ◽  
Positron Annihilation Spectroscopy ◽  
Transmission Electron ◽  
Rapidly Solidified ◽  
Thermal Stability Of

An alloy containing Al – 3wt.% Cr – 3wt.% Fe – 0.8wt. % Ce, was prepared by melt spinning. Structure of obtained ribbons was observed by light, scanning and transmission electron microscopy. It was found out that the structure is very fine. Microhardness of cross sectioned ribbons was also measured. Defects in structure were determined by positron annihilation spectroscopy. The thermal stability of the alloy was observed by comparing rapidly solidified ribbons and ribbons annealed at 400°C and at 500°C for 100 h

scholarly journals HIGH RESOLUTION TRANSMISSION ELECTRON MICROSCOPY STUDY OF CRYSTALLOGRAPHY AND MORPHOLOGY OF TiC PRECIPITATES IN ARGON IRRADIATED 18Cr10NiTi STEEL

2021 ◽  
pp. 26-31
Author(s):  
A.S. Kalchenko ◽  
S.A. Karpov ◽  
G.D. Tolstolutskaya
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Bubble Formation ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Surrounding Matrix ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
Relationship Of

This work encompasses identification of the crystal structure and analysis of the TiC precipitates in 18Cr-10Ni-Ti austenitic stainless steel under Ar-ions irradiation. High resolution transmission electron microscopy (HRTEM) and energy dispersive spectroscopy (EDS) are used. Orientation relationship of TiC particles in surrounding matrix are indicated by HRTEM and diffraction patterns. The size of the precipitates is found to be critical: the coherency of TiC is kept at the interfaces when the precipitate is in the stage of nucleation, whereas the growth of precipitate up to 10 nm can lead to the loss of coherency in the austenitic steel. The findings suggest that the incoherent precipitate-matrix interface is an important point defect sink and contributes to inert gas bubble formation at elevated irradiation temperatures.

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