The use of time-of-flight neutron Bragg edge imaging to measure the residual strains in W/Cu dissimilar joints for fusion reactors

Autor: Omar Mohamed, Bin Zhu, Nathanael Leung, Winfried Kockelmann, Thomas R. Barrett, Mark J. Whiting, Yiqiang Wang, Tan Sui
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Nuclear Materials and Energy, Vol 38, Iss , Pp 101593- (2024)
Druh dokumentu: article
ISSN: 2352-1791
DOI: 10.1016/j.nme.2024.101593
Popis: The European DEMOnstration power plant (EU DEMO) project is currently leading the research endeavours within the fusion field with the goal of developing a next generation fusion reactor. Given the challenging nature of the application, it is essential to establish methodologies that can provide convenient and reliable characterisation of the chosen materials within DEMO. In this paper, the recently developed Time-of-Flight Neutron Bragg Edge Imaging (TOF-NBEI) was used on Tungsten (W)/ Copper (Cu) dissimilar joints sample mock-ups of the cooling system design used in the critical divertor component with the goal of mapping the residual stresses across the sample. Residual strain mapping was performed on the W phase with considerable tensile residual strains identified close to the W-Cu interface. The large-grain microstructure of the Cu phase was analysed using the energy-resolved neutron radiographs. The results will be used as a basis for future TOF-NBEI experiments of tungsten monoblocks related to DEMO.
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