Microstructure effects on the recrystallization of low-symmetry alpha-uranium

McCabe, Rodney James; Richards, Andrew Walter; Coughlin, Daniel Robert; Clarke, Kester Diederik; Beyerlein, Irene Jane; Knezevic, Marko

doi:10.1016/j.jnucmat.2015.04.055

Title: Microstructure effects on the recrystallization of low-symmetry alpha-uranium

Journal Article · Thu Oct 01 00:00:00 EDT 2015 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2015.04.055· OSTI ID:1221383

McCabe, Rodney James ^[1]; Richards, Andrew Walter ^[1]; Coughlin, Daniel Robert ^[1]; Clarke, Kester Diederik ^[1]; Beyerlein, Irene Jane ^[2]; Knezevic, Marko ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
Univ. of New Hampshire, Durham, NH (United States). Dept. of Mech. Eng.

We employ electron backscatter diffraction (EBSD) to investigate microstructural evolution of uranium during recrystallization. To understand the relationship between microstructure and recrystallization, we use measures of intra-granular misorientation within grains and near grain boundaries in both deformed (non-recrystallized) uranium and recrystallizing uranium. The data show that the level of intra-granular misorientation depends on crystallographic orientation. However, contrary to expectation, this relationship does not significantly affect the recrystallization texture. Rather, the analysis suggests that recrystallization nucleation occurs along high angle grain boundaries in the deformed microstructure. Specifically, we show that the nucleation of recrystallized grains correlates well with the spatially heterogeneous distribution of high angle boundaries. Due to the inhomogeneous distribution of high angle boundaries, the recrystallized microstructure after long times exhibits clustered distributions of small and large grains. Twin boundaries do not appear to act as recrystallization nucleation sites.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396; 20140630ER

OSTI ID:: 1221383

Alternate ID(s):: OSTI ID: 1251996

Report Number(s):: LA-UR-15-21398; PII: S0022311515002743; TRN: US1500731

Journal Information:: Journal of Nuclear Materials, Vol. 465, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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