Abstract
Tensile properties at 250°C and swelling of beryllium, irradiated to 5 × 10 20 n/ cm 2 at about 450°C and subsequently annealed for up to 1000 h at 800, 900 and 1000°C were measured to elucidate the effect of helium bubbles formed during the annealing. Size and distribution of the bubbles in the matrix, grain surfaces, and grain edges and corners, respectively, were observed by a transmission or scanning electron microscope. It is concluded that the dense distribution of fine bubbles in the matrix contributes to strengthening of the metal, while bubbles in the grain edges and corners contribute to the swelling.
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