Abstract
Low cycle fatigue (LCF) tests were conducted in Zircaloy-4 with a total strain range of ±0.5% in the temperature range 573–873 K where dynamic strain aging (DSA) manifestations in uniaxial tensile tests were reported. A time dependent linear cyclic hardening stage is the principal feature observed in this alloy. The cyclic hardening rate exhibits a peak in this temperature range. In order to evaluate the strain rate effects on the cyclic hardening, tests at strain rates 2 × 10 −3 s −1 and 2 × 10 −4 s −1 were performed. The location of the cyclic hardening rate peak depends on the strain rate suggesting the operation of a thermally activated mechanism. Transmission electron microscopy (TEM) observations show that the linear hardening stage is characterized by a two-dimensional wall structure that evolves from the activation of two slip systems. DSA takes place during strain-controlled fatigue deformation at the same temperature range of that occurring during tensile deformation.
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