Mixing instabilities during shearing of metals

被引：0
作者：
Mohsen Pouryazdan
Boris J. P. Kaus
Alexander Rack
Alexey Ershov
Horst Hahn
机构：
[1] Karlsruhe Institute of Technology,Institute of Nanotechnology
[2] University of Mainz,Institute of Geosciences and Center for Computational Sciences
[3] European Synchrotron Radiation Facility,Institute for Photon Science and Synchrotron Radiation
[4] Karlsruhe Institute of Technology,Laboratory for Applications of Synchrotron Radiation
[5] Karlsruhe Institute of Technology,undefined
[6] Joint Research Laboratory Nanomaterials at Technische Universität Darmstadt,undefined
来源：
Nature Communications | / 8卷
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摘要：
Severe plastic deformation of solids is relevant to many materials processing techniques as well as tribological events such as wear. It results in microstructural refinement, redistribution of phases, and ultimately even mixing. However, mostly due to inability to experimentally capture the dynamics of deformation, the underlying physical mechanisms remain elusive. Here, we introduce a strategy that reveals details of morphological evolution upon shearing up to ultrahigh strains. Our experiments on metallic multilayers find that mechanically stronger layers either fold in a quasi-regular manner and subsequently evolve into periodic vortices, or delaminate into finer layers before mixing takes place. Numerical simulations performed by treating the phases as nonlinear viscous fluids reproduce the experimental findings and reveal the origin for emergence of a wealth of morphologies in deforming solids. They show that the same instability that causes kilometer-thick rock layers to fold on geological timescales is acting here at micrometer level.
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