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Activation Volume and Density of Mobile Dislocations in Plastically Deforming Zr-1pctSn-1pctNb-0.1pctFe Alloy

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Abstract

Stress relaxation and strain rate change tests were carried out in annealed Zr-1pctSn-1pctNb-0.1pctFe alloy at room temperature. The apparent and true activation volumes were determined and the results obtained from different techniques were compared. The stress dependence of activation volume was studied in a wide range of stresses, and an analysis was made in the light of the thermal activation theory. The results suggest that surmounting of the Peierls barrier is the rate-controlling factor in the room-temperature plasticity of the alloy. Dislocation exhaustion rate during initial stress relaxation is higher in the alloy.

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Acknowledgment

The authors would like to thank Dr. P. Spätig for valuable suggestions in carrying out repeated stress relaxation tests.

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Authors and Affiliations

  1. Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai, 400085, India

    Apu Sarkar (Scientific Officer E)

  2. Materials Group, Bhabha Atomic Research Centre, Mumbai, 400085, India

    J. K. Chakravartty (Director)

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  1. Apu Sarkar
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  2. J. K. Chakravartty
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Correspondence to Apu Sarkar.

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Manuscript submitted March 30, 2015.

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Sarkar, A., Chakravartty, J.K. Activation Volume and Density of Mobile Dislocations in Plastically Deforming Zr-1pctSn-1pctNb-0.1pctFe Alloy. Metall Mater Trans A 46, 5638–5643 (2015). https://doi.org/10.1007/s11661-015-3153-4

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  • DOI: https://doi.org/10.1007/s11661-015-3153-4

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