Quantifying the stress state in the vicinity of a δ-hydride in α-zirconium

Tummala, Hareesh; Capolungo, Laurent; Tomé, Carlos N.

doi:10.1016/j.jnucmat.2018.08.050

Quantifying the stress state in the vicinity of a δ-hydride in α-zirconium

Journal Article · Sat Sep 22 00:00:00 EDT 2018 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2018.08.050· OSTI ID:1711370

Tummala, Hareesh ^[1]; ^[1]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In zirconium alloys, precipitation of a hydride generally introduces internal stresses in the surrounding matrix. This study aims at understanding the role of internal stresses on the formation, growth and arrangement of δ-hydrides in α-zirconium. To this end, a Fast Fourier Transform based discrete dislocation dynamics technique is used to quantify both internal stresses induced during the formation of a hydride and the relief of the internal stresses by dislocation nucleation from the hydride-matrix interface. Overall, this work reveals that stress relaxation is localized in very small regions around the δ-hydride ( 300 nm). Further, it is proposed that the dislocations nucleated from the hydride-matrix interface could act as loci for the nucleation of new hydrides, thereby rationalizing experimentally observed hydride stacks. Finally, quantifying the stress relaxation resulting from dislocation nucleation reveals that diagonal components of the internal stress inside the hydride remain very high, i.e., >3.0 GPa. We find that this suggests that additional dissipative processes, intrinsic to the hydride, are necessary to diminish the aforementioned internal stress.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: 89233218CNA000001; AC05-00OR22725

OSTI ID:: 1711370

Alternate ID(s):: OSTI ID: 1635894
OSTI ID: 22765185

Report Number(s):: LA-UR--18-21181

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 511; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Quantifying the stress state in the vicinity of a δ-hydride in α-zirconium

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