Abstract Growth of helium (He) bubbles with different initial sizes in tungsten (W) has been investigated by performing molecular dynamics simulations. Based on the simulation results a new loop punching mechanism for the large helium bubble growth is proposed. Different from the growth of small-size He bubbles by pushing out self-interstitial atoms and then rearranging into a prismatic dislocation loop, a large-size bubble grows by pushing out a dislocation, subsequently cross-slipping of its screw components and finally evolving into a prismatic dislocation loop. Such dislocations may react with each other to form a dislocation net around the bubble rather than to convert to prismatic dislocation loops.

中文翻译：

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钨中氦气泡生长的新循环打孔机制

摘要 通过分子动力学模拟研究了不同初始尺寸的氦 (He) 气泡在钨 (W) 中的生长。基于模拟结果，提出了一种新的大氦气泡生长的循环冲压机制。不同于小体积的氦气泡通过推出自填隙原子然后重新排列成棱柱位错环的生长，大尺寸气泡通过推出位错而生长，随后其螺旋组分的交叉滑移最终演变为棱柱位错环。这种位错可能会相互反应以在气泡周围形成位错网，而不是转化为棱柱位错环。