Nonequilibrium plastic roughening of metallic glasses yields self-affine 
topographies with strain-rate and temperature-dependent scaling exponents

Nöhring, Wolfram Georg; Hinkle, Adam R.; Pastewka, Lars

doi:10.1103/PhysRevMaterials.6.075603

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Nonequilibrium plastic roughening of metallic glasses yields self-affine topographies with strain-rate and temperature-dependent scaling exponents

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Nöhring, Wolfram Georg
Research Department DeBeer, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Nöhring, W. G., Hinkle, A. R., & Pastewka, L. (2022). Nonequilibrium plastic roughening of metallic glasses yields self-affine topographies with strain-rate and temperature-dependent scaling exponents. Physical Review Materials, 6(6): 075603, pp. 1-8. doi:10.1103/PhysRevMaterials.6.075603.

Cite as: https://hdl.handle.net/21.11116/0000-000C-9B3F-0

Abstract

We study nonequilibrium roughening during compressive plastic flow of initially flat Cu50Zr50 metallic glass using large-scale molecular dynamics simulations. Roughness emerges at atomically flat interfaces beyond the yield point of the glass. A self-affine rough topography is imprinted at yield and is reinforced during subsequent deformation. The imprinted topographies have Hurst exponents that decrease with increasing strain rate and temperature. After yield, the root-mean-square roughness amplitude grows as the square root of the applied strain with a prefactor that also drops with increasing strain rate and temperature. Our calculations reveal the emergence of spatial power-law correlations from homogeneous samples during plastic flow with exponents that depend on the rate of deformation and the temperature. The results have implications for interpreting and engineering roughness profiles.