Atomic scale observation of grain boundary segregation in nuclear materials by atom probe tomography and study on mechanism of grain boundary degradation

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It is important to understand the degradation mechanism of the grain boundary in the structural materials of aged nuclear reactors for nuclear safety. We have developed new method to observe grain boundary segregations on inter-granular fractured surfaces using laser-assisted three-dimensional atom probe method. The obtained results, combined with the other methods such as Auger electron spectroscopy and the first principles calculations, showed the relationship between inter-granular fracture and grain boundary segregations.