Temperature threshold for preferential bubble formation on grain boundaries in tungsten under in-situ helium irradiation. (15th April 2020)

• Record Type: Journal Article
• Authors: El-Atwani, O.; Cunningham, W.S.; Perez, D.; Martinez, E.; Trelewicz, J.R.; Li, M.; Maloy, S.A.
• Is Part Of: Scripta materialia. Number 180(2020)
• Page Start: 6
• Page End: 10
• Publication Date: 2020-04-15
• Subjects: Grain boundaries -- Implantation -- In-situ -- Helium-vacancy complexes -- Electron microscopy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.01.013
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Understanding a material's radiation tolerance requires examining its performance under different irradiation conditions. Here, we investigate the radiation tolerance in terms of helium bubble damage in tungsten irradiated in-situ with 16 keV helium at 1073 K and 1223 K. Damage evolution represented by helium bubble density, size and total change in volume in the grain matrices and the grain boundaries are quantified as a function of fluence. Preferential large bubble formation and a higher change in volume on the grain boundaries occurred at 1223 K, suggesting faster migration of certain helium-vacancy complexes as confirmed by a diffusion-reaction model. Graphical abstract: Image, graphical abstract