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Prismatic slip in zirconium single crystals at elevated temperatures

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Abstract

Single crystals of Zr oriented favorably for prismatic slip have been deformed in tension over a range of strain rates at temperatures between 473 and 1113 K. A temperature independent plateau is observed between 600 and 800 K and dynamic strain aging occurs in the vicinity of 723 K. The flow stress is temperature dependent both above and below this temperature interval. Plastic flow above 850°K is represented by an equation of the form: {ie1217-05} where {ie1217-06} is the shear strain rate,A is a constant whose value is 680 ± 20 (MN/m2)−4.3. The stress exponentn = 4.3 ± 0.3 and the activation energyQ = 2.05 ± 0.15 eV. It is proposed that the high temperature prismatic slip in Zr is controlled by a glide-climb process where the rate of plastic flow is determined by the rate of climb of dislocations.

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Authors and Affiliations

  1. Department of Metallurgy, University of British Columbia, Vancouver, Canada

    A. Akhtar (Visiting Assistant Professor)

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  1. A. Akhtar
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Akhtar, A. Prismatic slip in zirconium single crystals at elevated temperatures. Metall Trans A 6, 1217–1222 (1975). https://doi.org/10.1007/BF02658531

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