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Driving innovations in manufacturing: Open Access research from DMEM

Strathprints makes available Open Access scholarly outputs by Strathclyde's Department of Design, Manufacture & Engineering Management (DMEM).

Centred on the vision of 'Delivering Total Engineering', DMEM is a centre for excellence in the processes, systems and technologies needed to support and enable engineering from concept to remanufacture. From user-centred design to sustainable design, from manufacturing operations to remanufacturing, from advanced materials research to systems engineering.

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Rapid nondestructive analysis of threading dislocations in wurtzite materials using the scanning electron microscope

Gunasekar, Naresh and Hourahine, Benjamin and Edwards, Paul and Day, A.P. and Winkelmann, Aimo and Wilkinson, A.J. and Parbrook, P.J. and England, G. and Trager-Cowan, Carol (2012) Rapid nondestructive analysis of threading dislocations in wurtzite materials using the scanning electron microscope. Physical Review Letters, 108 (13). ISSN 0031-9007

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Abstract

We describe the use of electron channeling contrast imaging in the scanning electron microscope to rapidly and reliably image and identify threading dislocations (TDs) in materials with the wurtzite crystal structure. In electron channeling contrast imaging, vertical TDs are revealed as spots with black-white contrast. We have developed a simple geometric procedure which exploits the differences observed in the direction of this black-white contrast for screw, edge, and mixed dislocations for two electron channeling contrast images acquired from two symmetrically equivalent crystal planes whose g vectors are at 120° to each other. Our approach allows unambiguous identification of all TDs without the need to compare results with dynamical simulations of channeling contrast.