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

JOURNAL OF NUCLEAR MATERIALS

卷:502

Article

Calhoun, C. A.¹  Garlea, E.²  Sisneros, T. A.³  Agnew, S. R.¹ 

[1] Univ Virginia, Mat Sci & Engn Dept, Charlottesville, VA 22903 USA

[2] Y 12 Natl Secur Complex, Dev Dept, Oak Ridge, TN 37830 USA

[3] Los Alamos Natl Lab, Subatom Phys Dept, P-25, Los Alamos, NM USA

关键词: Uranium;    Neutron diffraction;    Residual strain;    Internal strain;    EPSC;    Elasto-Plastic Self-Consistent modeling;    Twinning;    Deformation modes;   

DOI  :  10.1016/j.jnucmat.2018.01.036

来源: Elsevier

【 摘 要 】

In-situ strain neutron diffraction measurements were conducted at temperature on specimens coming from a clock-rolled alpha-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 degrees 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. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free