MULTISLICE SIMULATION OF TRANSMISSION ELECTRON MICROSCOPY IMAGING OF HELIUM BUBBLES IN IRON
The objective of this task is to establish the size correlation between transmission electron microscopy (TEM) imaged helium (He) bubbles and the actual bubbles in an iron (Fe) matrix. SUMMARY The results of this simulation study show that the size of TEM imaged He bubbles, represented by the inner diameter of the first dark Fresnel ring under defocused condition (Din), deviated from the actual bubble size (Do). Din was found to be larger than Do when imaged with a highly incoherent electron beam, but smaller than Do if the beam is coherent. The deviation of Din from Do increases with increasing defocus. On the other hand, the electron beam accelerating voltage, bubble size, bubble position, and TEM sample thickness do not significantly affect the value of D0/Do. This study also suggests that He bubbles can be differentiated from argon (Ar) bubbles by differences in Fresnel contrast.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1040990
- Report Number(s):
- PNNL-SA-86171; AT6020100; TRN: US201211%%320
- Resource Relation:
- Related Information: Fusion Materials Semiannual Progress Report for the Period Ending December 31, 2011, 51; DOE/ER-0313/51:85-89
- Country of Publication:
- United States
- Language:
- English
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