Instability of a molybdenum layer under deformation of a CuMoCu laminate by high-pressure torsion

V. Tavakkoli; A. Mazilkin; T. Scherer; M. Mail; Y. Beygelzimer; B. Baretzky; Y. Estrin; R. Kulagin

doi:10.1016/j.matlet.2021.130378

Instability of a molybdenum layer under deformation of a CuMoCu laminate by high-pressure torsion

V. Tavakkoli, A. Mazilkin, T. Scherer, M. Mail, Y. Beygelzimer, B. Baretzky, Y. Estrin, R. Kulagin

Mechanical Engineering

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5 Citations (Scopus)

Abstract

High-pressure torsion of a laminate consisting of a layer of monocrystalline molybdenum sandwiched between two layers of copper was investigated. Computed tomography showed that at sufficiently large angles of rotation of the anvils the molybdenum layer loses planarity. It develops periodic folds and vortices, leading to ruptures. EBSD analysis revealed the formation of a blocky substructure in the molybdenum layer and a pronounced fragmentation of copper sheets, with the formation of a significant proportion of high-angle grain boundaries. The proposed mathematical model of the process accounts for the observed phenomena qualitatively. It is based on the gradient plasticity theory and predicts the loss of stability of the harder molybdenum layer when the shear strain in the laminate exceeds a critical value.

Original language	English
Article number	130378
Journal	Materials Letters
Volume	302
DOIs	https://doi.org/10.1016/j.matlet.2021.130378
Publication status	Published - 1 Nov 2021

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title = "Instability of a molybdenum layer under deformation of a CuMoCu laminate by high-pressure torsion",

abstract = "High-pressure torsion of a laminate consisting of a layer of monocrystalline molybdenum sandwiched between two layers of copper was investigated. Computed tomography showed that at sufficiently large angles of rotation of the anvils the molybdenum layer loses planarity. It develops periodic folds and vortices, leading to ruptures. EBSD analysis revealed the formation of a blocky substructure in the molybdenum layer and a pronounced fragmentation of copper sheets, with the formation of a significant proportion of high-angle grain boundaries. The proposed mathematical model of the process accounts for the observed phenomena qualitatively. It is based on the gradient plasticity theory and predicts the loss of stability of the harder molybdenum layer when the shear strain in the laminate exceeds a critical value.",

keywords = "Computed tomography, Geometrically necessary dislocations, Gradient theory of plasticity, High-pressure torsion",

author = "V. Tavakkoli and A. Mazilkin and T. Scherer and M. Mail and Y. Beygelzimer and B. Baretzky and Y. Estrin and R. Kulagin",

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T1 - Instability of a molybdenum layer under deformation of a CuMoCu laminate by high-pressure torsion

AU - Tavakkoli, V.

AU - Mazilkin, A.

AU - Scherer, T.

AU - Mail, M.

AU - Beygelzimer, Y.

AU - Baretzky, B.

AU - Estrin, Y.

AU - Kulagin, R.

PY - 2021/11/1

Y1 - 2021/11/1

N2 - High-pressure torsion of a laminate consisting of a layer of monocrystalline molybdenum sandwiched between two layers of copper was investigated. Computed tomography showed that at sufficiently large angles of rotation of the anvils the molybdenum layer loses planarity. It develops periodic folds and vortices, leading to ruptures. EBSD analysis revealed the formation of a blocky substructure in the molybdenum layer and a pronounced fragmentation of copper sheets, with the formation of a significant proportion of high-angle grain boundaries. The proposed mathematical model of the process accounts for the observed phenomena qualitatively. It is based on the gradient plasticity theory and predicts the loss of stability of the harder molybdenum layer when the shear strain in the laminate exceeds a critical value.

AB - High-pressure torsion of a laminate consisting of a layer of monocrystalline molybdenum sandwiched between two layers of copper was investigated. Computed tomography showed that at sufficiently large angles of rotation of the anvils the molybdenum layer loses planarity. It develops periodic folds and vortices, leading to ruptures. EBSD analysis revealed the formation of a blocky substructure in the molybdenum layer and a pronounced fragmentation of copper sheets, with the formation of a significant proportion of high-angle grain boundaries. The proposed mathematical model of the process accounts for the observed phenomena qualitatively. It is based on the gradient plasticity theory and predicts the loss of stability of the harder molybdenum layer when the shear strain in the laminate exceeds a critical value.

KW - Computed tomography

KW - Geometrically necessary dislocations

KW - Gradient theory of plasticity

KW - High-pressure torsion

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DO - 10.1016/j.matlet.2021.130378

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SN - 0167-577X

VL - 302

JO - Materials Letters

JF - Materials Letters

M1 - 130378

ER -

Instability of a molybdenum layer under deformation of a CuMoCu laminate by high-pressure torsion

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