Crystals at High Deformation Rates Displaying Glassy Behavior

Abstract : When investigated as a function of deformation rate and time, model nano‐crystals exhibit a clear threshold in mechanical and relaxation behavior, this observation being valid in both the Hooke (elastic) and plastic regime. At low deformation rate ( ϵ ˙ < ϵ ˙ c ≃ 5 × 1 0 5    s − 1 ) , materials are able to equilibrate with ongoing deformation, whereas ultra‐fast deformations bring the system out of equilibrium on the same nanosecond timescale. The time evolution of stress is investigated and suggests features that are typical of glassy relaxation with a stretched exponential behavior for stress relaxation that is only encountered for large deformation rates. Related relaxation times furthermore reveal a rapid increase with ϵ ˙ . These results actually link general aspects of plastic deformation, irreversibility and thermal equilibrium.
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Submitted on : Monday, September 2, 2019 - 4:49:14 PM
Last modification on : Monday, September 16, 2019 - 4:35:59 PM

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Ali Rida, Matthieu Micoulaut, Emmanuelle Rouhaud, Ali Makke. Crystals at High Deformation Rates Displaying Glassy Behavior. physica status solidi (b), Wiley, 2019, 256 (8), pp.1800649. ⟨10.1002/pssb.201800649⟩. ⟨hal-02276509⟩

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