Abstract
The static strain-ageing response of Zr-1 wt% Nb alloy was determined in the temperature interval 295 to 773 K. The parameter Δσ was found to exhibit two maxima at approximately 330 and 573 K, with possible minor peaks at 520 and 630 K. A yield drop after ageing was observed in the temperature range 500 to 700 K with maxima at 573 and 623 K. This behaviour is interpreted in terms of Snoek ordering of substitutional-interstitial atom pairs or complexes in the stress fields of horizontal arrays of glide dislocations. The three high temperature peaks in Δσ are thought to be due to oxygen complexes while at 330 K a faster diffusing interstitial, for example hydrogen, is possibly of importance. A dense cellular substructure was not a necessary prerequisite for strain ageing to produce a yield drop but rather such substructures are thought to be the result of dynamic strain ageing.
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