Subsurface deuterium bubble formation in W due to low-energy high flux deuterium plasma exposure. (22nd December 2016)

• Record Type: Journal Article
• Authors: Jia, Y.Z.; Liu, W.; Xu, B.; Qu, S.L.; Shi, L.Q.; Morgan, T.W.
• Is Part Of: Nuclear fusion. Volume 57:Number 3(2017:Mar.)
• Publication Date: 2016-12-22
• Subjects: bubble -- tungsten -- deuterium -- TEM; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/57/3/034003
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: The deuterium (D) bubbles formed in W exposed to high flux D plasma were researched by scanning electron microscopy and transmission electron microscopy. After D plasma exposure at 500 K and 1000 K, a layer of nano-sized bubbles were homogenously distributed in W subsurface region. The D bubbles were homogenously nucleated due to the high D concentration, and the nucleation process is not related to the vacancy defects. At low temperature (500 K), D bubbles can grow by surface blistering, which caused different nano scale morphologies on different surfaces. At high temperature (1000 K), D bubbles mainly grow by vacancy clustering, which caused pinholes on the surface.