In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium

Journal Article · 03 February 2018 · Journal of Nuclear Materials

DOI: https://doi.org/10.1016/j.jnucmat.2018.01.036 · OSTI ID:1478070

Calhoun, C. A. ^[1]; Garlea, E. ^[2]; Sisneros, T. A. ^[3]; Agnew, S. R. ^[1]

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1. Univ. of Virginia, Charlottesville, VA (United States)
2. Y-12 National Security Complex, Oak Ridge, TN (United States)
3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In-situ strain neutron diffraction measurements were conducted at temperature on specimens coming from a clock-rolled α-uranium plate, and Elasto-Plastic Self-Consistent (EPSC) modeling was employed to interpret the findings. The modeling revealed that the active slip systems exhibit a thermally activated response, while deformation twinning remains athermal over the temperature ranges explored (25-150 °C). The modeling also allowed assessment of the effects of thermal residual stresses on the mechanical response during compression. These results are consistent with those from a prior study of room-temperature deformation, indicating that the thermal residual stresses strongly influence the internal strain evolution of grain families, as monitored with neutron diffraction, even though accounting for these residual stresses has little effect on the macroscopic flow curve, except in the elasto-plastic transition.

• Research Organization: Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: NA0001942
• OSTI ID: 1478070
• Report Number(s): IROS302
• Journal Information: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 502; ISSN 0022-3115
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English