δ-Hydride Habit Plane Determination in α-Zirconium at 298 K by Strain Energy Minimization Technique |
| Journal |
Defect and Diffusion Forum (Volume 279) |
| Volume |
Phase Transformation and Diffusion |
| Edited by |
G. B. Kale, M. Sundararaman, G. K. Dey and G. P. Tiwari |
| Pages |
105-110 |
| DOI |
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 Method (FEM), Habit Plane, Strain Energy Minimization, α-Zirconium, δ-Hydride |
| 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. |
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