Stress fields at boundaries between contacting particles
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Small metal particles in the size range 0.1 μm sometimes exhibit stress fringes near the contacting boundary as observed in the transmission electron microscope. The possible causes for these stress fields are investigated in terms of different models: adhesion, external forces (possibly magnetic), dislocations in the grain boundary area or “squeezed-in” extra material in the grain boundary zone. In all these cases high stresses are expected near the contacting area. Adhesion between particles becomes more apparent the smaller they are and is thus very important in nanotechnology.
KeywordsStress Field Magnetic Force Rayleigh Wave Particle Radius Dislocation Loop
The Swedish Research Council is gratefully thanked for their support of this work. Dr. P.W. Karlsson is thanked for helpful comments.