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Nucleation theory for yielding of nearly defect-free crystals: Understanding rate dependent yield points

Research output: Contribution to journalArticle

Vikrant Sagar Reddy, P Nath, Juergen Horbach, Peter Kurt Sollich, Surajit Sengupta

Original languageEnglish
JournalPhysical Review Letters
Publication statusAccepted/In press - 20 Dec 2019

Documents

  • 1908.08829

    1908.08829.pdf, 2.79 MB, application/pdf

    1/01/2020

    Accepted author manuscript

King's Authors

Abstract

Experiments and simulations show that when an initially defect free rigid crystal is subjected to deformation at a constant rate, irreversible plastic flow commences at the so-called yield poin. The yield point is a weak function of the deformation rate, which is usually expressed as a power law with an extremely small non-universal exponent. We re-analyze a representative set of published data on nanometer sized, mostly defect free, Cu, Ni and Au crystals in the light of a recently proposed theory of yielding based on nucleation of stable stress-free regions inside the metastable rigid solid. The single relation derived here, which is {\em not} a power law, explains data covering fifteen orders of magnitude in time scales.

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