Nucleation mechanism of intra-granular blisters in tungsten exposed to hydrogen plasma. (October 2020)

• Record Type: Journal Article
• Authors: Chen, W.Q.; Wang, X.Y.; Li, K.L.; Wang, Y.N.; Morgan, T.W.; Xu, B.; Chiu, Y.L.; Liu, W.
• Is Part Of: Scripta materialia. Number 187(2020)
• Page Start: 243
• Page End: 249
• Publication Date: 2020-10
• Subjects: Tungsten -- Hydrogen plasma -- Blister -- Nucleation mechanism; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.06.024
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Despite being a subject of long-term research on fusion-reactor structural materials, the behaviour of hydrogen in tungsten under plasma exposure remains unclear. Here, the explicit transmission electron microscopy observations for recrystallised W after hydrogen plasma exposure are successfully obtained. These are the first observations to show the intra-granular blisters are located on the {100} planes. Molecular dynamics simulations confirm the hydrogen blister initiating at <100> dislocation core behaved similarly to those in experiment. We propose that the widely reported intra-granular hydrogen blisters are nucleated at the <100> edge dislocation core and develop along the (100) plane in tungsten. Graphical abstract: Image, graphical abstract