关键词: 热等静压扩散连接, 超声波检测, Be-Cu界面, 扩散层, 退火

Abstract:

Be and CuCrZr alloys for ITER first wall are connected by the thermal isostatic pressure diffusion
bonding technique, and partial connectors that completed the diffusion connection are annealed. Using ultrasonic
nondestructive testing of all connectors, defects in the Be-Cu connection interface of unannealed connector are
observed. In order to analyze the cause of the defect in the diffusion interface, a sample from the defect zone of
the connector was selected and analyzed with the interface microanalysis. By observing the micromorphology and
analyzing the change of alloying elements in the diffusion layer of the interface, it was found that the thickness of
the Cu-Ti diffusion layer and the thickness of the Ti layer in the Be-Cu diffusion interface after annealing were
increased. The probability of the formation of the brittle phase between the Be and the Cu elements in the middle
layer was reduced. The thickness of the whole diffusion layer became larger and the range of diffusion was larger.
The experimental results show that the annealing process can change the structure of Be-Cu thermal isostatic
pressure diffusion layer and expand the range of diffusion bonding.

Key words: Thermal isostatic pressure diffusion bonding, Ultrasonic test, Be-Cu interface, Diffusion layer; Annealing