Abstract
Radiation hardening induced by radiation defect is one of key properties to understand the radiation damages in materials. In BCC tungsten, through atomic simulations, we firstly demonstrate the appearance of only He-bubbles could result in the weaker resistance of system to indentation. Both the He/V ratio and the size of He-bubbles affect the indentation process, especially the appearances of the yield points and slopes of the curves, because of the free space and stress field induced by different He-bubbles. These results provide a key step for understanding the contribution of He-bubble to radiation hardening in nuclear materials.
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