Abstract
Specimens of 20% cold worked 316L SS were irradiated with 2.5 MeV 4He + at room temperature, 500 and 600°C separately. The bubble structures in bulk were investigated in a transmission electron microscope with cross sectional technique. As the irradiation temperature is raised from room temperature to 500°C, the bubbles grow slowly. When the irradiated temperature is varied from 500 to 600°C, the bubbles grow very fast. This means there is a turning point of bubbles evolution between 500 and 600°C. At the same temperature, the bubble size and density tend to saturation with the increasing of helium atom concentration and displacement per atom (dpa).
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