δ-Hydride Habit Plane Determination in α-Zirconium at 298 K by Strain Energy Minimization Technique

Abstract:

Hydrogen in excess of solid solubility precipitates as hydride phase of plate shaped morphology in hcp α-Zr with the broad face of the hydride plate coinciding with certain crystallographic plane of α-Zr crystal called habit plane. The objective of the present investigation is to predict the habit plane of δ-hydride precipitating in α-Zr at 298 K using strain energy minimization technique. The δ-hydride phase is modeled to undergo isotropic elasto-plastic deformation. The α-Zr phase was modeled to undergo transverse isotropic elastic deformation but isotropic plastic deformation. Accommodation strain energy of δ-hydride forming in α-Zr crystal was computed using initial strain method as a function of hydride nuclei orientation. Hydride was modeled as disk with round edge. Contrary to several habit planes reported in literature for δ- hydrides precipitating in α-Zr crystal, the total accommodation energy minima at 298 K suggests only basal plane i.e. (0001) as the habit plane.

• Periodical: Defect and Diffusion Forum (Volume 279)
• Pages: 105-110
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.279.105
• Online since: August 2008
• Authors: R.N. Singh, Per Ståhle, Leslie Banks-Sills, Matti Ristinmaa, S. Banerjee
• Keywords: Accommodation Energy, Finite Element Model (FEM), Habit Plane, Strain Energy Minimization, α-Zirconium, δ-Hydride

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