The occurrence and characteristics of Luders deformation in polycrystalline zinc

After some "special" low-temperature rolling and subsequent ageing at room temperature of polycrystalline zinc of 99.99% purity L u d e r s-type defor mation occurs. This effect results from the localisation of deformation (tw inning) which leads to "asynchronization" of work hardening, recovery and r ecrystallization processes in different parts of material. As a consequence , poligonal substructure and, probably, "special" grain size are formed. L u d e r s strain increases with decreasing grain size and deformation rate as well as with the increase of deformation temperature.