期刊
2016 IUTAM SYMPOSIUM ON NANOSCALE PHYSICAL MECHANICS
卷 21, 期 -, 页码 78-85出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.piutam.2017.03.040
关键词
Tungsten; Ion implantation; Helium; Laue micro-diffraction; Surface Acoustic Waves; Thermal transport
资金
- John Fell fund [122/643]
- Royal Society [RG130308]
- NSF [CHE-1111557]
- United Kingdom Engineering and Physical Sciences Research Council [EP/H018921/1]
- Euratom research and training programme [633053]
- U.S. DOE [DE-AC02-06CH11357]
Tungsten is a likely material for divertor armour in fusion reactors. We describe recent progress combining multi-technique experiments with atomistic modelling to understand how injected helium interacts with displacement damage and modifies the physical properties of tungsten. Using X-ray micro-diffraction and laser-induced transient grating measurements, we observe both a lattice swelling and modulus change after helium implantation. Surprisingly, a fraction of a percent lattice expansion is associated with an order of magnitude larger reduction in elastic modulus. These observations are interpreted using a combined elasticity and density functional theory model. We also measure a large reduction of thermal diffusivity due to helium implantation. This can be explained in terms of the underlying damage microstructure using a new atomistic kinetic theory model. Together our observations and calculations allow us to begin to form a joined-up picture of helium-implantation-induced damage in tungsten and its diverse effects on microstructure and physical properties. (C) 2017 The Authors. Published by Elsevier B.V.
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