Borodin, Elijah N.

Mayer, Alexander E.

Mayer, Polina N.

Micro mechanisms of plastic deformation and the defect structure evolution are sufficiently changing with the strain rate increase. It leads to non-monotonic relations between the macroscopic characteristics of metal strength or ductility and the structure parameters such as a grain size. Our simulations predict an inverse Hall-Petch relation for ultrafine-grained metals at extremely high strain rate (above 107s-1). Mechanisms of the homogeneous nucleation of dislocations and the mechanical twining can effectively decrease the stresses at strain rates up to 109s -1.</p

Grain size dependence of the yield stress for metals at quasistatic and dynamic loadings

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