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Helium(He)is a typical impurity in metals,which is produced from(n,α)transmutation reactions in both fission and fusion.It is well known that He atoms are energetically favorable clustering with each other,producing point defects,and further resulting in radiation damage and mechanical property degradation of metals.The self-trapping of He should be responsible for the effects of He on the properties of metals.However,the physical intrinsic mechanism for He self-trapping is still unclear.