Showing papers by "David Bacon published in 1988"
TL;DR: In this paper, the authors investigated the structural properties of hexagonal-close-packed metals using computer simulation techniques and found that the core structures, in particular the core widths, are very sensitive to the interatomic potential used and can be extremely wide for the (1012) and (1121) boundaries.
167 citations
TL;DR: In this paper, the results of computer simulations of intrinsic point defects and their clusters in the hexagonal-close-packed (hcp) metals are reviewed, and trends and features of defect properties are revealed which may well represent behaviour in some real metals.
88 citations
TL;DR: In this paper, the properties of clusters of a small number (≤7) of self-interstitials in bodycentred-cubic transition metals have been studied by computer simulation using model interatomic potentials of the embedded-atom type.
Abstract: The properties of clusters of a small number (≤7) of self-interstitials in bodycentred-cubic transition metals have been studied by computer simulation using model interatomic potentials of the embedded-atom type. The potentials employed are empirically-based and include many-body forces between nearneighbour atoms: they were originally developed by Finnis and Sinclair (1984) and contain recent modifications of the repulsive cores by Ackland and Thetford (1987). The W, α-Fe and Mo potentials have been found to model distinct types of behaviour with regard to preferred cluster geometries, which seem to arise from the relative stability of the possible orientations of the single interstitial. The results are discussed in terms of the Eyre-Bullough mechanism of dislocation loop formation and unfaulting. For the W model a ⟨111⟩ orientation is favoured (even for the single interstitial). For α-Fe the ⟨111⟩ orientation quickly becomes dominant with increased cluster size, while for Mo there is some ten...
25 citations
TL;DR: In this paper, the authors describe the preliminary results of heavy ion and proton irradiation damage in vanadium and vanadium-titanium alloys of potential interest as fusion reactor first wall materials.
10 citations
TL;DR: The geometry and energy of small clusters of interstitials and vacancies have been studied by computer simulation using an n-body interatomic potential for vanadium in this article, showing that for up to four defects, faulted platelets are most stable, but beyond this size the 1 2 111) form is favoured.
4 citations
TL;DR: In this paper, the properties of defects in the h.c.p, metals are discussed, including properties of vacancies and self-interstitials, and the structure of twin-boundary dislocations.
Abstract: Recent modelling of defects in the h.c.p, metals is discussed, including the properties of vacancies and self-interstitials, and the structure of twin-boundary dislocations. Most simulations have used pair potentials, and their strengths and weaknesses are described. It is shown that an understanding of the atomic structure of h.c.p, defects is at last emerging.