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- W2034139333 abstract "The Nye tensor characterizes the strength of infinitesimal dislocations at each point in a continuously dislocated crystal, and provides a measure of the Burgers vector and the extent of dislocation dissociation. The present work employs this description to analyze ½ screw dislocations in bcc Mo obtained by Finnis–Sinclair, Bond Order Potential and first-principles simulations in an attempt to detect misfit in the core region. The spatial distribution and strength of the fractional dislocations are calculated and compared between the different simulated core structures. The Nye tensor technique is also applied to HREM images of end-on screw dislocations in Mo to detect the edge fractional dislocations predicted by simulation. The advantage of the Nye tensor for this purpose arises from its insensitivity to the Eshelby twist due to surface relaxation in a thin TEM foil (this is not the case for the more conventional methods of depicting misfit, such as direct and differential displacement maps). Although the Eshelby twist was removed from the experimental HREM images, some residual, mottled contrast structure was observed in the Nye tensor plots. This contrast was found to be due to the experimental noise, which masks the true structure of the dislocation core and precludes experimental characterization of screw dislocations in Mo by HREM." @default.
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- W2034139333 date "2006-10-11" @default.
- W2034139333 modified "2023-09-27" @default.
- W2034139333 title "Use of the Nye tensor in analyzing HREM images of bcc screw dislocations" @default.
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- W2034139333 doi "https://doi.org/10.1080/14786430600660849" @default.
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