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Enhanced structural evolution in the dynamic plasticity of fcc metals

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Above true strain rates of 10s−1, fcc metals begin to exhibit a rapid increase in strength. Attempts at modelling this transition have led to two general theories as to the underlying mechanisms. Firstly, the drift velocity of the dislocations imparting strain has been proposed to become limited by viscous-like scattering with phonons in the metal. Meanwhile, other authors have proposed that the ever-reducing timescale of slip gives rise to changes in the evolution of dislocation structure. Regardless of the chosen mathematical framework, the fundamental natures of the two proposed mechanisms provide testable qualitative predictions about material behaviour. Measurements of a pure copper show the strengthening to arise from increased rates of work hardening, a phenomenon which has received little theoretical attention.

This talk is part of the Physics and Chemistry of Solids Group series.

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