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From Micro‐ to Macroplasticity
Summary
This materials science perspective discusses the transition from microplastic deformation (below the yield stress) to macroplastic deformation in nanocrystalline metals, noting that the traditional 0.2% yield stress definition does not accurately capture when bulk plastic flow begins. This is a materials physics study on metal deformation behavior with no relevance to environmental microplastics.
The microplastic regime, where materials exhibit plastic deformation at stresses well below the yield stress, is of great importance for the precise design of functional materials. In polycrystalline metals, it is taken for granted that the majority of grains are plastically deforming at the macroscopic yield stress; however, there is no easy method to verify this assumption. The figure shows that for electrodeposited nanocrystalline Ni the usual 0.2 % definition of yield stress does not correspond with the onset of macroscopic plasticity.
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