Abstract
In the temperature range 723 to 823 K (450° to 550°C) annealed, crystal bar α-Zr exhibits anomalous behavior with respect to both single stress and incrementally stressed creep tests. The nature and extent of the anomalous behavior depends on temperature, stress, and impurity content. Specimens with low oxygen content exhibit: 1) normal, three-stage creep behavior during single stress tests, and 2) normal transients during incremental stress and temperature tests. Specimens with higher oxygen contents exhibit: 1) multi-stage creep curves whose shapes depend on temperature and stress, 2) inverse transients following stress and temperature increments, and 3) peaks in activation energy-tempera-ture curves. The nature of the anomalous behavior is consistent with a model for strain aging in which the possibility of localized depletion of the strain aging species exists. In the material being studied oxygen is probably responsible for the observed effects.
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R. D. WARDA, formerly of Department of Metallurgy, University of British Columbia
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Warda, R.D., Fidleris, V. & Teghtsoonian, E. Dynamic strain aging during creep of α-Zr. Metall Trans 4, 1201–1206 (1973). https://doi.org/10.1007/BF02644512
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DOI: https://doi.org/10.1007/BF02644512