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DOI: 10.5445/IR/1000077374

Mixing instabilities during shearing of metals

Pouryazdan, Mohsen; Kaus, Boris J. P.; Rack, Alexander; Ershov, Alexey; Hahn, Horst

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.

Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Laboratorium für Applikationen der Synchrotronstrahlung (LAS)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 2041-1723
URN: urn:nbn:de:swb:90-773741
KITopen ID: 1000077374
HGF-Programm 43.22.01; LK 01
Erschienen in Nature Communications
Band 8
Seiten Art.Nr.:1611
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Geodynamics; Metals and alloys; Structural geology; Theory and computation
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