Abstract
Serrated yielding was observed in quenched Al single crystals and quenched dilute Al-Zn single crystals, which had been deformed by tension at room temperature.The characteristics of serrated yielding of these crystals were investigated by its dependence on quenching temperature, tempering temperature, and strain rate, and appearance of slip lines.The principal results obtained were as follows:(1) The serrated yielding was observed only in single crystals containing Frank-sessile dislocation loops as secondary lattice defects.(2) The dependence of the serrated yielding on quenching and tempering temperatures would by attributed to sizes and densities of the Frank-sessile dislocation loops.(3) The dependence of the yielding on strain rate would be attributed to the interaction between moving dislocations and Frank-sessile dislocation loops.(4) It would be concluded from these experiments that the serrated yielding may be controlled by superjogs formed by the interaction between the moving dislocations and the Frank-sessile dislocation loops.
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