Mechanisms of Anode-Initiated Vacuum Insulator Flashover for Pulsed Power Applications.
Abstract not provided.
Hopkins, Matthew M↗
Engineering topics
Goeke, Ronald
Publications and source records attributed to Goeke, Ronald.
Surface Charge Effects on Secondary Electron Emission from Dielectrics.
Abstract not provided.
Echo, Zakari↗
Helium Bubbles and Blistering in a Nanolayered Metal/Hydride Composite
Helium is insoluble in most metals and precipitates out to form nanoscale bubbles when the concentration is greater than 1 at.%, which can alter the material properties. Introducing controlled defects such as multilayer interfaces may offer some level of helium bubble management. This study investigates the effects of multilayered composites on helium behavior in ion-implanted, multilayered ErD 2 /Mo thin film composites. Following in-situ and ex-situ helium implantation, scanning and transmission electron microscopy showed the development of spherical helium bubbles within the matrix, but primarily at the layer interfaces. Bubble linkage and surface blistering is observed after high fluence ex-situ helium implantation. These results show the ability of metallic multilayers to alter helium bubble distributions even in the presence of a hydride layer, increasing the lifetime of materials in helium environments.
36 MATERIALS SCIENCE↗