摘要
Migration of He atoms and growth of He bubbles in high angle twist grain boundaries(HAGBs)in tungsten(W)are investigated by atomic simulation method.The energy and free volume(FV)of grain boundary(GB)are affected by the density and structure of dislocation patterns in GB.The migration energy of the He atom between the neighboring trapping sites depends on free volume along the migration path at grain boundary.The region of grain boundary around the He bubble forms an ordered crystal structure when He bubble grows at certain grain boundaries.The He atoms aggregate on the grain boundary plane to form a plate-shape configuration.Furthermore,high grain boundary energy(GBE)results in a large volume of He bubble.Thus,the nucleation and growth of He bubbles in twist grain boundaries depend on the energy of grain boundary,the dislocation patterns and the free volume related migration path on the grain boundary plane.
Migration of He atoms and growth of He bubbles in high angle twist grain boundaries(HAGBs) in tungsten(W) are investigated by atomic simulation method. The energy and free volume(FV) of grain boundary(GB) are affected by the density and structure of dislocation patterns in GB. The migration energy of the He atom between the neighboring trapping sites depends on free volume along the migration path at grain boundary. The region of grain boundary around the He bubble forms an ordered crystal structure when He bubble grows at certain grain boundaries. The He atoms aggregate on the grain boundary plane to form a plate-shape configuration. Furthermore, high grain boundary energy(GBE) results in a large volume of He bubble. Thus, the nucleation and growth of He bubbles in twist grain boundaries depend on the energy of grain boundary, the dislocation patterns and the free volume related migration path on the grain boundary plane.
作者
Fang-Biao Li
Guang Ran
Ning Gao
Shang-Quan Zhao
Ning Li
李芳镖;冉广;高宁;赵尚泉;李宁(College of Energy,Xiamen University,Xiamen 361102,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 73000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100094,China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.11305136,11675230,11375242,and U1832112)
