Superposition of solid solution and dispersion strengthening in the system (Cu-0.65at.%Au)- SiO₂

It has been experimentally investigated how the contributions 1) t_s of solved gold-atomes and 2) t_p of incoherent, amorphous SiO₂-particles superimpose to the total actually measured critical resolved shear stress t_t of (Cu-0.65at.%Au)-SiO₂-single crystals. The SiO₂-particles have been grown by internal oxidation. In contrast to the long standing believe that t_t is a linear function of t_p and t_s a non-linear one has presently been found: t_t^k = t_p^k + t_s^k with k » 1.8.

Beteiligte Wissenschaftler:

Dr. B. Anczykowski (Physikalisches Institut, WWU), Dr. D. Baither, Dr. U. Lagerpusch (bis August 2000), Dr. V. Mohles, Prof. Dr. E. Nembach

Veröffentlichungen:

Lagerpusch, U., V. Mohles, D. Baither, B. Anczykowski, E. Nembach: Double strengthening of copper by dissolved gold-atoms and by incoherent SiO₂-particles: how do the two strengthening contributions superimpose?, Acta Mater., 48, 3647, 2000

Lagerpusch, U., B. Anczykowski, E. Nembach: Comparison of atomic force and transmission electron microscopy of second phase particles, Phil. Mag., in press

Dissertation: U. Lagerpusch: "Überlagerung von Dispersions- und Mischkristallhärtung im System CuAu-SiO₂" (2000)