An investigation of superplasticity in a thermomechanically processed U-2Mo (α + δ) alloy |
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Authors: | G M Ludtka R E Oakes R L Bridges J L Griffith |
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Affiliation: | (1) Oak Ridge National Laboratory, Martin Marietta Energy Systems, Inc., 37831-6092 Oak Ridge, TN;(2) Oak Ridge Y-12 Plant, Martin Marietta Energy Systems, Inc., 37831-6092 Oak Ridge, TN;(3) Oak Ridge Y-12 Plant, Martin Marietta Energy Systems, Inc., 37831-6092 Oak Ridge, TN;(4) Oak Ridge Y-12 Plant, Martin Marietta Energy Systems, Inc., 37831-6092 Oak Ridge, TN |
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Abstract: | A uranium-2 molybdenum (U-2Mo) alloy was shown to exhibit superplastic behavior over the β + γ two-phase field temperature
regime and over a limited temperature span in the α + γ field. At Oak Ridge, two distinct processes were developed that evolved
microstructures conducive to superplasticity. These microstructures were shown to exhibit superplasticity (elongations >500
pct) over a broad range of strain rates, from 2.5 × 10-4 to 1 × 10-2 s-1. A maximum value of 700 pct elongation was reached at 695 °C and a true constant strain rate of 2.5 × 10-3 s-1. This study details the processing sequences, microstructures, strain-rate sensitivity, and maximum elongation data generated
to characterize the superplastic U-2Mo alloy. In addition, the fracture and cavitation analyses conducted on constant strain-rate
tensile test specimens are discussed. |
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