Abstract
Systematic investigations of substitutional solution hardening are reported for f.c.c. systems particularly suited for a quantitative analysis with the Fleischer-Friedel theory. The application of a physically founded potential function for the interaction of glide barriers with edge dislocations proves as important. For Cu Ge and Cu Mn, the latter system satisfying best the requirements of theory, thermodynamic parameters for dislocation glide are determined with high reliability by an iterative procedure jointly analysing τ 0( T)- and V( T)-data. Density and distance of the discrete glide barriers are deduced and arguments put forward that mainly doublets ( Cu Mn) and triplets ( Cu Ge) represent the effective glide barriers in these systems. Low temperature anomalies (inertial and quantum effects), an athermal stress component of the crss, the concentration dependence of effective stress at T = 0, the stress dependence of activation volume and the stress equivalence are discussed.
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