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In-situ transmission electron microscopy (TEM) study was performed to investigate the microstructural changes in tungsten during low energy He^+ ion irradiations in electron microscope linked with an ...ion accelerator. The irradiations were carried out with 8keV and 0.25keV He^+ ions at 293K, 873K and 1073K. In the case of 8keV irradiation, irradiation induced vacancies act as nucleation site for dislocation loop and helium bubbles. Accordingly, such defects were formed even at the higher temperature regimes. With increasing the irradiation temperature, the growth rates of dislocation loop and helium bubble rise remarkably. Though no vacancies are produced during 0.25keV irradiation, helium platelets, interstitial loops and helium bubbles were formed. Impurity atoms may act as trapping centers of He atoms, which form bubbles by ejecting W atoms form their lattice site.show more
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