The mechanical properties of an Alloy 718 window after irradiation in a spallation environment

A double-shelled Alloy 718 window was irradiated at the Los Alamos Neutron Science Center (LANSCE) with a I mA, 800 MeV proton beam to a maximum dose of 20 dpa at a calculated irradiation temperature of 400 degreesC. After ir radiation, the window was visually inspected in hot cells at the Chemical a nd Metallurgical Research (CMR) facility at the Los Alamos National Laborat ory (LANL) and cut into strips for analysis. Microhardness and optical meta llography were performed at the LANL hot cells and tensile testing and gamm a measurements were performed at Forschungszentrum Julich. The results of t hese analyses are presented in comparison with previous results obtained on similarly irradiated Alloy 718 components. A crack that occurred in-servic e was also examined and possible failure modes are discussed. (C) 2001 Else vier Science B.V. All rights reserved.