TEM study of the deformation structures around nano-scratches |
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| Authors: | PC Wo IP Jones AHW Ngan |
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| Institution: | 1. Department of Mechanical Engineering , The University of Hong Kong , Pokfulam Road, Hong Kong, P.R. China h9703264@hkusua.hku.hk;3. School of Metallurgy and Materials, University of Birmingham, Edgbaston , Birmingham, B15 2TT, United Kingdom;4. Department of Mechanical Engineering , The University of Hong Kong , Pokfulam Road, Hong Kong, P.R. China |
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| Abstract: | An in-plane transmission electron microscopy (TEM) investigation carried out on nano-scratches made in a Ni3Al foil revealed a high dislocation density within the scratch core, resulting in severe crystal rotations. The amount and sense of rotation were found to be asymmetrical about the longitudinal centre line of the scratch. Cross-sectional TEM analysis revealed that almost all the dislocations were confined within a semicircular zone having a radius similar to the calculated tip-sample contact size during scratching, in agreement with the in-plane TEM observations. |
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| Keywords: | nano-scratch focused ion-beam milling nanoidentation TEM dislocations |
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