Abstract
The effect of discontinuous increases in strain rate on the yield behavior of specimens undergoing type A serrated yielding has been investigated. Above a critical increase in strain rate, a transition in the subsequent yield behavior, from further type A yielding to continuous yielding was observed. The transition in yield behavior was assumed to occur when the Lüders band transit time, t L , equalled the time required for ageing dislocations behind the band, t a . Measurements of the effect of strain on the yield transition gave 1/ t a = 1.11 × 10 2 ε 1.1 sec −1. The expression form 1/ t a together with measurements of the strain rate dependence of the critical strain for serrated yielding gave ρL = 1.6 × 10 6 ε 0.9 cm −1, where ρ is the mobile dislocation density and L is the effective obstacle spacing. The effect of strain rate changes on the Lüders strain was also investigated.
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