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

Calhoun, C. A.; Garlea, E.; Sisneros, T. A.; Agnew, S. R.

doi:10.1016/j.jnucmat.2018.01.036

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

Abstract

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.

Authors:

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

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

Publication Date:: Sat Feb 03 00:00:00 EST 2018

Research Org.:: Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1478070

Report Number(s):: IROS302
Journal ID: ISSN 0022-3115

Grant/Contract Number:: DE-NA0001942

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Materials

Additional Journal Information:: Journal Volume: 502; Journal Issue: C; Journal ID: ISSN 0022-3115

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; uranium; neutron diffraction; residual strain; internal strain; EPSC; Elasto-Plastic Self-Consistent modeling; twinning; deformation modes

Citation Formats


                    Calhoun, C. A., Garlea, E., Sisneros, T. A., and Agnew, S. R. In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium.  United States: N. p., 2018. 
Web.  doi:10.1016/j.jnucmat.2018.01.036.

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                    Calhoun, C. A., Garlea, E., Sisneros, T. A., & Agnew, S. R. In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium.  United States.  https://doi.org/10.1016/j.jnucmat.2018.01.036

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                    Calhoun, C. A., Garlea, E., Sisneros, T. A., and Agnew, S. R. Sat .  
"In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium".  United States.  https://doi.org/10.1016/j.jnucmat.2018.01.036.  https://www.osti.gov/servlets/purl/1478070.

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@article{osti_1478070,

  title        = {In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium},

  author       = {Calhoun, C. A. and Garlea, E. and Sisneros, T. A. and Agnew, S. R.},

  abstractNote = {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.},

  doi          = {10.1016/j.jnucmat.2018.01.036},

  journal      = {Journal of Nuclear Materials},

  number       = C,

  volume       = 502,

  place        = {United States},

  year         = {Sat Feb 03 00:00:00 EST 2018},

  month        = {Sat Feb 03 00:00:00 EST 2018}

}

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Cited by: 9 works

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Figures / Tables:

Figure 1: The measured pole figures from the room temperature sample prior to deformation. The loading direction is out of the page parallel to the rolling direction. TD is the transverse direction and ND is the normal direction.

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