Evaluation of oxide dispersion strengthened (ODS) molybdenum and molybdenum-rhenium alloys

Oxide dispersion strengthened (ODS) molybdenum alloys being developed for high temperature applications possess excellent high temperature strength and creep resistance. In addition they exhibit a ductile-to-brittle transition temperature (DBTT) in the worked and stress-relieved condition under longitudinal tensile load well below room temperature, However, in the recrystallized condition, the DBTT may be near or above room temperature. depending on the: volume fraction of oxide dispersion and the amount of prior work. Dilute rhenium additions (7 and 14 wt%) to ODS molybdenum were evaluated to determine their effect on low temperature ductility. The addition of 7 wt%, rhenium to the ODS molybdenum did not significantly enhance the mechanical properties. However, the addition of 14 wt% rhenium to the ODS molybdenum resulted in a DBTT well below room temperature in both the stress-relieved and recrystallized condition. Additionally. the tensile strength of ODS Mo-14 Re is greater than the base ODS molybdenum at 1000-1250 degreesC. (C) 2001 Elsevier Science Ltd. All rights reserved.