Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion

A. P. Zhilyaev; G. V. Nurislamova; B. K. Kim; M. D. Baró; J. A. Szpunar; T. G. Langdon

doi:https://doi.org/10.1016/S1359-6454(02)00466-4

Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion

A. P. Zhilyaev, G. V. Nurislamova, B. K. Kim, M. D. Baró, J. A. Szpunar, T. G. Langdon

Department of Physics

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Abstract

Pure nickel was selected for a detailed investigation of the experimental parameters influencing grain refinement and microstructural evolution during processing by high-pressure torsion (HPT). Samples were examined after HPT using microhardness measurements, transmission electron microscopy and orientation imaging microscopy. Processing by HPT produces a grain size of ∼170 nm in pure Ni, and homogeneous and equiaxed microstructures are attained throughout the samples when they are subjected to at least ∼5 whole revolutions under applied pressures of at least ∼6 GPa. For these conditions, the distributions of grain boundary misorientations are similar in the center and at the periphery of the samples. A simple model is proposed to explain the development of a homogeneous microstructure in HPT. © 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

Original language	English
Pages (from-to)	753-765
Journal	Acta Materialia
Volume	51
DOIs	https://doi.org/10.1016/S1359-6454(02)00466-4
Publication status	Published - 7 Feb 2003

Keywords

Hardness testing
High-pressure torsion
Nickel
Orientation imaging microscopy
Transmission electron microscopy

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title = "Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion",

abstract = "Pure nickel was selected for a detailed investigation of the experimental parameters influencing grain refinement and microstructural evolution during processing by high-pressure torsion (HPT). Samples were examined after HPT using microhardness measurements, transmission electron microscopy and orientation imaging microscopy. Processing by HPT produces a grain size of ∼170 nm in pure Ni, and homogeneous and equiaxed microstructures are attained throughout the samples when they are subjected to at least ∼5 whole revolutions under applied pressures of at least ∼6 GPa. For these conditions, the distributions of grain boundary misorientations are similar in the center and at the periphery of the samples. A simple model is proposed to explain the development of a homogeneous microstructure in HPT. {\textcopyright} 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.",

keywords = "Hardness testing, High-pressure torsion, Nickel, Orientation imaging microscopy, Transmission electron microscopy",

author = "Zhilyaev, {A. P.} and Nurislamova, {G. V.} and Kim, {B. K.} and Bar{\'o}, {M. D.} and Szpunar, {J. A.} and Langdon, {T. G.}",

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TY - JOUR

T1 - Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion

AU - Zhilyaev, A. P.

AU - Nurislamova, G. V.

AU - Kim, B. K.

AU - Baró, M. D.

AU - Szpunar, J. A.

AU - Langdon, T. G.

PY - 2003/2/7

Y1 - 2003/2/7

N2 - Pure nickel was selected for a detailed investigation of the experimental parameters influencing grain refinement and microstructural evolution during processing by high-pressure torsion (HPT). Samples were examined after HPT using microhardness measurements, transmission electron microscopy and orientation imaging microscopy. Processing by HPT produces a grain size of ∼170 nm in pure Ni, and homogeneous and equiaxed microstructures are attained throughout the samples when they are subjected to at least ∼5 whole revolutions under applied pressures of at least ∼6 GPa. For these conditions, the distributions of grain boundary misorientations are similar in the center and at the periphery of the samples. A simple model is proposed to explain the development of a homogeneous microstructure in HPT. © 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

AB - Pure nickel was selected for a detailed investigation of the experimental parameters influencing grain refinement and microstructural evolution during processing by high-pressure torsion (HPT). Samples were examined after HPT using microhardness measurements, transmission electron microscopy and orientation imaging microscopy. Processing by HPT produces a grain size of ∼170 nm in pure Ni, and homogeneous and equiaxed microstructures are attained throughout the samples when they are subjected to at least ∼5 whole revolutions under applied pressures of at least ∼6 GPa. For these conditions, the distributions of grain boundary misorientations are similar in the center and at the periphery of the samples. A simple model is proposed to explain the development of a homogeneous microstructure in HPT. © 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

KW - Hardness testing

KW - High-pressure torsion

KW - Nickel

KW - Orientation imaging microscopy

KW - Transmission electron microscopy

U2 - https://doi.org/10.1016/S1359-6454(02)00466-4

DO - https://doi.org/10.1016/S1359-6454(02)00466-4

M3 - Article

VL - 51

SP - 753

EP - 765

ER -

Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion

Abstract

Keywords

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