Tensile properties and fracture mode of a wrought ODS molybdenum sheet following fast neutron irradiation at temperatures ranging from 300 degrees C to 1000 degrees C

摘要

A commercially available wrought oxide dispersion strengthened (ODS) molybdenum alloy was irradiated in the high flux isotope reactor (HFIR) at 294-936 degrees C to neutron fluences between 2.28 and 24.7 x 10(25) n/m(2) (E > 0.1 MeV) or (1.2-13.1 dpa-Mo). Irradiation of ODS molybdenum at 300 degrees C and 600 degrees C results in large increases in strength (57-173%). The DBTT for 300 degrees C-irradiated ODS Mo was 800 degrees C, which is the same as observed for low carbon are cast (LCAC) and TZM molybdenum irradiated to the same dose. The DBTT for 600 degrees C-irradiated ODS Mo was room-temperature, which is a significant improvement over the DBTT values determined for LCAC (300 degrees C) and TZM (700 degrees C) and from literature data. The micro-structural feature of small, elongated grains likely enhances the resistance of ODS to irradiation embrittlement. Irradiation of ODS Mo at 870-1000 degrees C resulted in small increases in yield strength (10-34%) with a post-irradiated DBTT comparable to non-irradiated material (-100 degrees C). (c) 2005 Elsevier B.V. All rights reserved.