Quantifying the stress fields due to a delta-hydride precipitate in alpha-Zr matrix

Technical Report · Thu Oct 19 04:00:00 EDT 2017

DOI:https://doi.org/10.2172/1402569· OSTI ID:1402569

Tummala, Hareesh ^[1]; Capolungo, Laurent ^[1]; Tome, Carlos N. ^[1]

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

This report is a preliminary study on δ-hydride precipitate in zirconium alloy performed using 3D discrete dislocation dynamics simulations. The ability of dislocations in modifying the largely anisotropic stress fields developed by the hydride particle in a matrix phase is addressed for a specific dimension of the hydride. The influential role of probable dislocation nucleation at the hydride-matrix interface is reported. Dislocation nucleation around a hydride was found to decrease the shear stress (S₁₃) and also increase the normal stresses inside the hydride. We derive conclusions on the formation of stacks of hydrides in zirconium alloys. The contribution of mechanical fields due to dislocations was found to have a non-negligible effect on such process.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1402569
• Report Number(s): LA-UR--17-29185
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE