Author： Nembach E. Pretorius T. Ronnpagel D.
Publisher： Taylor & Francis Ltd
ISSN： 0141-8610
Source： Philosophical Magazine. A. Physics of Condensed Matter. Defects and Mechanical Properties, Vol.78, Iss.4, 1998-10, pp. : 949-963
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Abstract
The glide of a dissociated dislocation across a shearable coherent fcc particle embedded in a fcc matrix has been simulated on a computer. The particle and matrix have different stacking-fault energies. The flexibility of both partial dislocations has been fully allowed for. An Al-rich Al-Ag alloy served as a model system. Thus numerical values for the maximum interaction force F0 sim (rho) between the dislocation and the particle have been obtained; rho is the radius of its intersection with the glide plane. F0 sim (rho) is compared with the former analytical function F0 str (rho), which had been derived on the basis of the 'straight-line approximation'. F0 sim (rho) turns out to be smaller than F0 str (rho). After a suitable adjustment, F0 str (rho) can be used to represent the numerical data F0 sim (rho). Inserting F0 str (rho) into Friedel's relation for the critical resolved shear stress yields an analytical description of stacking-fault energy mismatch strengthening.
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