I. Binkowski

University of Münster

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Gerhard Wilde

University of Münster

Sergiy V. Divinski

University of Münster

Mikhail Seleznev

TU Bergakademie Freiberg

Martin Peterlechner

University of Münster

Jürgen Horbach

Heinrich Heine University Düsseldorf

Gaurav P. Shrivastav

TU Wien

Harald Rösner

University of Münster

René Hubek

University of Münster

Niklas Nollmann

University of Münster

J. Leuthold

Research Institute for Electromagnetic Materials

Cooperative Institutions

University of Münster

Instituto de Ciencia de Materiales de Sevilla

CeNTech

Shanghai University

Beijing University of Technology

Heinrich Heine University Düsseldorf

National University of Science and Technology

ETH Zurich

Ruhr University Bochum

Institute of Mechanics

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Структурные и диффузионные исследования объемных металлических стекол на основе палладия после пластической деформации

Mikhail Seleznev I. Binkowski Sergiy V. Divinski Gerhard Wilde Mikhail Seleznev

Работа выполнена при финансовой поддержке совместного гранта Германской службы академических обменов (DAAD) и Министерства образования и науки Российской Федерации в рамках программы «Михаил Ломоносов III» (Проект № 3723).

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Intrinsic heterogeneity of shear banding: Hints from diffusion and relaxation measurements of Co micro-alloyed PdNiP-based glass

Journal of Applied Physics (2020)

René Hubek Mikhail Seleznev I. Binkowski Martin Peterlechner Sergiy V. Divinski

The influence of Co micro-alloying (1 at. %) on the shear band diffusion and the relaxation processes in a model PdNiP bulk metallic glass is investigated. The shear bands are induced by one-pass cold-rolling. In addition to a fast shear band diffusion branch (Dsb≃10−16m2/s at 473 K), with the diffusivity being similar to that observed for the cold-rolled standard Pd40Ni40P20 composition, an ultrafast diffusion branch (Dsb≃10−14m2/s at the same temperature) is found to exist in the micro-alloyed glass. Combined with previously reported observations of faster relaxation of both the Boson peak height and the fictive temperature, the results indicate that Co micro-alloying affects the excess free volume distribution and thus changes the potential energy landscape of the glass, introducing a higher number of local atomic arrangements prone to the formation of shear transformation zones under plastic deformation.

Shear matrix

Shear band

Atomic diffusion

10.1063/1.5142162

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Shear band relaxation in a deformed bulk metallic glass studied by radiotracer diffusion and atomistic simulation

arXiv (Cornell University) (2015)

I. Binkowski Gaurav P. Shrivastav Jürgen Horbach Sergiy V. Divinski Gerhard Wilde

Relaxation of shear bands in a Pd40Ni40P20 bulk metallic glass is investigated by a combination of the radiotracer technique and molecular dynamics (MD) computer simulation (in the latter case using a model for Ni80P20), serving for determining for the first time the effective activation enthalpy of Ag diffusion along the shear bands in the Pd40Ni40P20 glass as only 55 kJ/mol. The shear bands are established to relax during annealing below glass transition temperature and the diffusion enhancement evolves with time in a non-monotonous manner. A phenomenological model accounting for an inhomogeneous distribution of excess free volume in shear bands and in the surrounding matrix is proposed. In the MD simulation, glass samples subjected to a constant strain rate are considered. Development of shear bands and the subsequent relaxation of stresses are characterized on a microscopic to mesoscopic scales. Mean-square displacement as well as strain maps indicate that the inhomogeneity, as manifested in shear bands in the systems under shear, persist after the shear is switched off. We observe a relaxation towards residual stresses that are localized in regions where the shear band has been present before although the system is - different from the macroscopic experiment - homogeneous with respect to the local density. These results indicate that even on a local scale one may expect strong dynamic heterogeneity in deformed glassy solids due to shear banding.

Shear band

Shear matrix

Mesoscopic physics

Mean squared displacement

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Shear band relaxation in a deformed bulk metallic glass

Acta Materialia (2016)

I. Binkowski Gaurav P. Shrivastav Jürgen Horbach Sergiy V. Divinski Gerhard Wilde

Shear band

Shear matrix

Mesoscopic physics

10.1016/j.actamat.2016.02.061

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Sub-micron strain analysis of local stick-slip motion of individual shear bands in a bulk metallic glass

Applied Physics Letters (2015)

I. Binkowski S. Schlottbom J. Leuthold Stefan Ostendorp Sergiy V. Divinski

Nanodot deposition on a side surface of a rectangular sample and digital image correlation are used to quantify the in-plane strain fields associated with the propagation of a shear band in a PdNiP bulk metallic glass, induced by rolling. Within the resolution of the method related to an average inter-dot distance of 100 nm, deformation is found to be highly localized at the shear bands, while alternating areas with a size of 100–400 nm with opposite local shear strains are found. This phenomenon substantiates a local stick-slip nature of shear band propagation during the metallic glass deformation, even during rolling.

Strain (injury)

Shear band

10.1063/1.4936388

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Impact of micro-alloying on the plasticity of Pd-based Bulk Metallic Glasses

arXiv (Cornell University) (2015)

Niklas Nollmann I. Binkowski Volkmar Schmidt Harald Rösner Gerhard Wilde

Micro-alloying was performed using additions of Co and Fe to monolithic Pd40Ni40P20 bulk metallic glass to study selectively the influence on the plastic behavior in uniaxial compression and three-point bending tests. The corresponding Poisson's ratios were determined by ultrasonic measurements. The microstructure of the individual bulk metallic glasses was characterized by electron microscopy, X-ray diffraction and calorimetry. A plastic strain of 13% was found for the Co addition (1 at.%), whereas the Fe addition (0.6 at.%) led to immediate failure after reaching the elastic limit. Surprisingly, the plasticity is not reflected by the high Poisson's ratio of 0.4 since it remained unaffected by the minor alloying.

Poisson's ratio

10.48550/arxiv.1506.02413

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Impact of micro-alloying on the plasticity of Pd-based bulk metallic glasses

Scripta Materialia (2015)

Niklas Nollmann I. Binkowski V. Hugo Schmidt Harald Rösner Gerhard Wilde

10.1016/j.scriptamat.2015.08.030

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The impact of micro-alloying on relaxation dynamics in Pd40Ni40P20 bulk metallic glass

Journal of Applied Physics (2018)

René Hubek Mikhail Seleznev I. Binkowski Martin Peterlechner Sergiy V. Divinski

The impact of Co micro-alloying on low temperature specific heat capacity and the relaxation processes in a model Pd40Ni40P20 bulk metallic glass in both as-cast and cold-rolled states was investigated. In addition to an excess (Boson) peak at low temperatures of about 12 to 14 K, a magnetic heat capacity anomaly in the Co alloyed glass below 10 K was observed. The measured Boson peak heights and the fictive temperatures both advocate a much faster β relaxation in the micro-alloyed glass. Yet, the micro-alloying does not measurably affect the enthalpy associated with α-relaxation. The impact of shear bands on the thermodynamic properties of the micro-alloyed glass is discussed.

10.1063/1.5047846

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Citations (16)

Shear band relaxation in a deformed bulk metallic glass

arXiv (Cornell University) (2015)

I. Binkowski Gaurav P. Shrivastav Jürgen Horbach Sergiy V. Divinski Gerhard Wilde

Relaxation of shear bands in a Pd40Ni40P20 bulk metallic glass was investigated by a combination of radiotracer diffusion and molecular dynamics (MD) simulations, allowing to determine for the first time the effective activation enthalpy of diffusion along shear bands in a deformed glass. The shear bands relax during annealing below the glass transition temperature and the diffusion enhancement reveals unexpectedly a non-monotonous behavior. The development of shear bands and the subsequent relaxation of stresses after switching off the shearing are characterized on microscopic to mesoscopic length scales by MD simulation subjecting the model glass to a constant strain rate. Mean-squared displacements as well as strain maps indicate that the heterogeneity, as manifested by shear bands in the systems under shear, persist after the shear is switched off. We observe a further relaxation of residual stresses that remain localized in regions where the shear band has been present before, although the system is - different from the macroscopic experiment - homogeneous with respect to the local density. These results indicate that even on a local scale one may expect strong dynamic heterogeneity in deformed glassy solids due to shear banding. The results thus suggest that plastically deformed metallic glasses present poly-amorphous systems that necessitate descriptions that are analogous to multiphase materials including the presence of heterophase interfaces.

Shear band

Shear matrix

Mesoscopic physics

Shearing (physics)

10.48550/arxiv.1506.03031

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The impact of elastic and plastic strain on relaxation and crystallization of Pd–Ni–P-based bulk metallic glasses

Acta Materialia (2015)

Yu.P. Mitrofanov Martin Peterlechner I. Binkowski M.Yu. Zadorozhnyy I.S. Golovin

10.1016/j.actamat.2015.03.001

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Citations (33)