Mohamed, O; Zhu, B; Leung, N; Kockelmann, W; Barrett, T R; Whiting, M J; Wang, Y; Sui, T (2024) The use of time-of-flight neutron Bragg edge imaging to measure the residual strains in W/Cu dissimilar joints for fusion reactors. Nuclear Materials and Energy, 38. 101593 ISSN 23521791

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Abstract

The DEMOnstrative power plant (DEMO) project is currently leading the research endeavours within the fusion field with the goal of developing a next generation practical 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.

Item Type:	Article
Keywords:	Time of Flight- Neutron Bragg Edge Imaging (TOF-NBEI), Residual stresses, Characterisation, Neutron analysis, Fusion materials, Texture
Subjects:	Advanced Materials > Non-Destructive Testing
Divisions:	Materials and Mechanical Metrology
Identification number/DOI:	10.1016/j.nme.2024.101593
Last Modified:	08 May 2026 10:33
URI:	https://eprintspublications.npl.co.uk/id/eprint/10374