12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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Computational modelling of Zr-Nb alloys by solid solution approach

Presented by Ms. Moyahabo CHUMA on 14 Jul 2011 from 13:45 to 14:00
Type: Oral Presentation
Session: CMPMS2
Track: Track A - Condensed Matter Physics and Material Science

Content

<p>We use density functional theory to investigate the structural, elastic properties and energetic stabilities of Zr, Nb and its alloys in the alpha and beta phases, employing pseudopotential plane wave methods within the Pardew-Burke-Ernzerhof Generalized Gradient Approximation (PBE-GGA). The structures were fully optimized in a non-magnetic state, allowing atomic positions, cell volume and shape to change. Lattice parameters for the pure phases gave excellent agreement with the available experimental data. We also found that the phonon dispersions curves display soft-modes for the metastable beta-Zr phase which is lacking on the alpha-Zr and beta-Nb, condition of mechanical stability. The solid solution calculations show that an increase in the Nb contents destabilizes the structures in both the alpha and beta phases. Interestingly, the calculated elastic moduli for Zr-2.3%Nb are in good agreement to the experimental results of Zr-2.5%Nb.

Level (Hons, MSc, PhD, other)?

Hons

Consider for a student award (Yes / No)?

Yes

Short Paper

Yes

Place

Location:
Room: Acro1


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