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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...
The nucleation and growth of helium (He) bubbles in the bulk and at Σ3〈110〉{112} and Σ73b〈110〉{661} grain boundaries (GBs) in bcc iron have been investigated using molecular dynamics simulations. The results show that a 1/2〈111〉{111} dislocation loop is formed with the sequential collection of 〈111〉 interstitial crowdions at the periphery of the He cluster and is eventually emitted from the He cluster...
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