Microstructural Characterization of Annealed and Aged Refractory Alloys

Technical Report · Tue Nov 01 04:00:00 EST 2005

DOI:https://doi.org/10.2172/2317767· OSTI ID:2317767

Leonard, Keith J. ^[1]; Busby, Jeremy T. ^[1]; Hoelzer, David T. ^[1]; Mayotte, Jackie Ronald ^[1]; Thomas, K. A. ^[1]; Jones, J. W. ^[1]; Zinkle, Steve J. ^[2]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
2. Univ. of Tennessee, Knoxville, TN (United States)

Microstructural stability is a key issue in understanding and predicting the long-term performance of refractory alloys in proposed space reactor applications. The microstructure of candidate alloys may change significantly during extended exposure to the high temperatures, but an in-depth study of the effects of aging is currently lacking. This work provides a detailed characterization of the microstructures of candidate refractory alloys before and after aging at space reactor relevant conditions. Samples of Mo- 41Re, Mo-47.5Re, FS-85, ASTAR-811C, T-111 and Nb-1Zr have been aged in an inert (He or Ne) environment for 1100 h at 1098, 1248, or 1398 K. Characterization of the microstructures through optical, scanning electron, and transmission electron microscopy of the aged materials have been performed and compared to the as-annealed materials. In addition the changes in electrical resistivity and microhardness as a result of aging are briefly discussed along with tensile properties of the samples.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Naval Reactors; National Aeronautics and Space Administration (NASA)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 2317767
• Report Number(s): ORNL/LTR/NR--PROM1/05-35
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE