Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 509, Issue -, Pages 260-266Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2018.07.004
Keywords
Tungsten; He implantation; Mechanical properties; Spherical nanoindentation; Molecular dynamics
Funding
- National Magnetic Confinement Fusion Science Program of China [2014GB117000]
- National Nature Science Foundation of China [51471092, 11405150]
- Central South University
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In this work, we utilized spherical nanoindentation to investigate the mechanical property changes of helium (He) implanted tungsten (W) at different damage doses. According to the indentation stress-strain curve, two dose dependent phenomena were revealed: one is an increase in yield stress with increasing damage dose, and the other is enhanced softening following yield. Experimental measurements such as transmission electron microscopy (TEM) and positron annihilation spectroscopy (PAS) techniques, as well as molecular dynamics (MD) simulation were combined to explore the intrinsic mechanism of the dose dependent phenomena. This study proposed an efficient and promising way to measure the damage of the plasma facing materials and established an effective correlation between the mechanical property changes of He implanted W and its microstructure evolutions. (C) 2018 Elsevier B.V. All rights reserved.
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