Aging effects on microstructural and mechanical properties of select refractory metal alloys for space-reactor applications |
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Authors: | Keith J. Leonard Jeremy T. Busby Steven J. Zinkle |
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Affiliation: | Oak Ridge National Laboratory, Materials Science and Technology Division, P.O. Box 2008, Oak Ridge, TN 37831-6138, United States |
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Abstract: | Refractory alloys based on niobium, tantalum and molybdenum are potential candidate materials for structural applications in proposed space nuclear reactors. Long-term microstructural stability is a requirement of these materials for their use in this type of creep dominated application. Early work on refractory metal alloys has shown aging embrittlement occurring for some niobium and tantalum-base alloys at temperatures near 40% of their melting temperatures in either the base metal or in weldments. Other work has suggested microstructural instabilities during long-term creep testing, leading to decreased creep performance. This paper examines the effect of aging 1100 h at 1098, 1248 and 1398 K on the microstructural and mechanical properties of two niobium (Nb-1Zr and FS-85), tantalum (T-111 and ASTAR-811C) and molybdenum (Mo-41Re and Mo-47.5Re) base alloys. Changes in material properties are examined through mechanical tensile testing coupled with electrical resistivity changes and microstructural examination through optical and electron microscopy analysis. |
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Keywords: | 89.30.Gg 81.05.Bx 81.40.Cd 62.20.Hg 62.20.Fe |
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