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The rate dependence and microstructure of high-purity silver deformed to large strains between 0.16 and 0.30T m

  • Mechanical Behavior
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Abstract

High-purity polycrystalline silver was deformed to large strains in torsion at temperatures from 203 to 373 K (0.16 to 0.30T m)at a variety of strain rates. Saturation of the flow stress was always observed. However, saturation is achieved only after relatively large strains over which both Stage III and Stage IV hardening are observed. At 373 K, there is mechanical and micro-structural evidence of dynamic recrystallization. At ambient temperature and below, hardening processes seem to be balanced exclusively by dynamic recovery, and steady-state creep is observed. The recovered microstructure is dominated by elongated subgrains. Subgrain boundaries are well-defined, and the misorientation across the walls is relatively high. The activation energy and strain-rate sensitivity for steady-state flow were measured. Furthermore, the constant-structure strain-rate sensitivity was measured as a function of primary strain from small strain levels (ε<0.01) up to steady-state values (approximately 3.0). The observed activation energies and strain-rate sensitivities are related to fundamental processes.

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  1. Materials Division, Lawrence Livermore National Laboratory, 94550, Livermore, CA

    M. E. Kassner (Section Leader for Physical Metallurgy and Joining)

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Kassner, M.E. The rate dependence and microstructure of high-purity silver deformed to large strains between 0.16 and 0.30T m . Metall Trans A 20, 2001–2010 (1989). https://doi.org/10.1007/BF02650286

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