From: Design of Radiation Tolerant Nanostructured Metallic Multilayers Date of download: 12/22/2017 Copyright © ASME. All rights reserved. From: Design of Radiation Tolerant Nanostructured Metallic Multilayers J. Eng. Mater. Technol. 2012;134(4):041010-041010-9. doi:10.1115/1.4006979 Figure Legend: (a) The He (solid curve) and vacancy concentration (dashed curve) profiles of He irradiated Cu/Mo 5 nm films obtained from SRIM simulations. Arrows indicate the location of specimens examined by XTEM experiments in (b)–(f). Note that locations (c) and (f) have the same He concentration, but the vacancy concentration at (c) is a lot greater. He bubbles are observed mainly in Cu at location b (b), begin to appear in Mo in region c (c), and start to grow primarily in Cu at location d (d) with arrows pointing at larger bubbles along layer interfaces. Bubbles are distributed throughout the layers in (e), and predominantly aligned along interface in (f).