EFFECTS OF HYDROGEN AND HELIUM INPLANTATION ON FUSION REACTOR MATERIALS AND ITS MECANICAL PROPERTIES

采用原位透射电子显微镜（TEM）研究了低能He离子辐照下钼（MO）、钨(W)的微观结构变化。用8keV和0.25keV的He离子在293K、873K、1073K进行辐照。在8keV辐照钨的情况下，辐照诱导的空位是位错环和氦泡的成核位点。因此，这种缺陷即使在较高的温度下也能形成。随着辐照温度的升高，位错环和氦泡的生长速率显著增大。在0.25keV辐照下，虽然没有产生空位，但形成了氦血小板、间隙环和氦泡。杂质原子可以作为He原子的俘获中心，He原子通过喷射W原子形成气泡，W原子通过喷射钨原子形成气泡。

An in situ transmission electron microcopy (TEM) study was performed to investigate the microstructural changes in Molybdenum (MO), tungsten (W) during low energy He ion irradiations in electron microscope attached with ion accelerator. The irradiation was carried out with 8keV and 0.25keV He ions at 293K, 873K, 1073K. In the case of 8keV irradiation on tungsten, 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, 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, which form bubbles by ejecting tungsten atoms form their lattice site.