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Severe plastically deformed commercially pure aluminum : Substructure, micro-texture and associated mechanical response during uniaxial tension. / Lanjewar, Harishchandra; Naghdy, Soroosh; Vercruysse, Florian; Kestens, Leo A.I.; Verleysen, Patricia.

In: Materials Science and Engineering A, Vol. 764, 138195, 2019.

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Lanjewar, Harishchandra ; Naghdy, Soroosh ; Vercruysse, Florian ; Kestens, Leo A.I. ; Verleysen, Patricia. / Severe plastically deformed commercially pure aluminum : Substructure, micro-texture and associated mechanical response during uniaxial tension. In: Materials Science and Engineering A. 2019 ; Vol. 764.

BibTeX

@article{e6ded2b0196b4e2cb1b9bb9077abd6be,
title = "Severe plastically deformed commercially pure aluminum: Substructure, micro-texture and associated mechanical response during uniaxial tension",
abstract = "Severe plastic deformation (SPD) of metals to obtain ultra-fine or even nano-sized grains has proven to be an interesting concept explored over the last few decades. However, the mechanical behavior of SPD metals and the underlying microstructural phenomena are not fully understood yet. In present work, commercially pure aluminum was subjected to high pressure torsion (HPT) deformation with strains ranging from very low levels to values well in the steady-state microstructure regime. The mechanical properties of the HPT processed samples were determined using tensile tests on miniature samples using full-field strain mapping. Orientation imaging microscopy (OIM) was utilized to follow the progression of grain refinement and texture as a function of imposed SPD. Local orientation based misorientation gradients helped to perform statistical boundary analysis and determine the fractions of incidental and geometrically necessary dislocation (GND) boundaries and local GND densities. From probability density distributions of the misorientation gradients two different stages of microstructural evolution, namely, fragmentation and saturation, could be discerned. The strength increased monotonously and the uniform elongation, though lower than the value of the annealed material, enhanced with the imposed strain in HPT. The post-necking response was observed to be highly microstructure dependent, where a lower grain size augmented the resistance for micro-crack propagation and enhanced the elongation-to-failure. In addition, the work hardening response corresponding to the yield point displayed maxima coinciding with the onset of the saturation stage. Anisotropy in fracture strain, observed between the axial and radial directions in a disk-like HPT sample, reduced with the randomization of shear texture, while higher intensities of the C {100}<110> orientation was considered responsible for the lower elongation-to-failure along the radial direction.",
keywords = "Commercial purity aluminum, High pressure torsion, Micro-texture, Statistical boundary analysis, Tensile properties, Work hardening",
author = "Harishchandra Lanjewar and Soroosh Naghdy and Florian Vercruysse and Kestens, {Leo A.I.} and Patricia Verleysen",
year = "2019",
doi = "10.1016/j.msea.2019.138195",
language = "English",
volume = "764",
journal = "Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing",
issn = "0921-5093",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Severe plastically deformed commercially pure aluminum

T2 - Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing

AU - Lanjewar, Harishchandra

AU - Naghdy, Soroosh

AU - Vercruysse, Florian

AU - Kestens, Leo A.I.

AU - Verleysen, Patricia

PY - 2019

Y1 - 2019

N2 - Severe plastic deformation (SPD) of metals to obtain ultra-fine or even nano-sized grains has proven to be an interesting concept explored over the last few decades. However, the mechanical behavior of SPD metals and the underlying microstructural phenomena are not fully understood yet. In present work, commercially pure aluminum was subjected to high pressure torsion (HPT) deformation with strains ranging from very low levels to values well in the steady-state microstructure regime. The mechanical properties of the HPT processed samples were determined using tensile tests on miniature samples using full-field strain mapping. Orientation imaging microscopy (OIM) was utilized to follow the progression of grain refinement and texture as a function of imposed SPD. Local orientation based misorientation gradients helped to perform statistical boundary analysis and determine the fractions of incidental and geometrically necessary dislocation (GND) boundaries and local GND densities. From probability density distributions of the misorientation gradients two different stages of microstructural evolution, namely, fragmentation and saturation, could be discerned. The strength increased monotonously and the uniform elongation, though lower than the value of the annealed material, enhanced with the imposed strain in HPT. The post-necking response was observed to be highly microstructure dependent, where a lower grain size augmented the resistance for micro-crack propagation and enhanced the elongation-to-failure. In addition, the work hardening response corresponding to the yield point displayed maxima coinciding with the onset of the saturation stage. Anisotropy in fracture strain, observed between the axial and radial directions in a disk-like HPT sample, reduced with the randomization of shear texture, while higher intensities of the C {100}<110> orientation was considered responsible for the lower elongation-to-failure along the radial direction.

AB - Severe plastic deformation (SPD) of metals to obtain ultra-fine or even nano-sized grains has proven to be an interesting concept explored over the last few decades. However, the mechanical behavior of SPD metals and the underlying microstructural phenomena are not fully understood yet. In present work, commercially pure aluminum was subjected to high pressure torsion (HPT) deformation with strains ranging from very low levels to values well in the steady-state microstructure regime. The mechanical properties of the HPT processed samples were determined using tensile tests on miniature samples using full-field strain mapping. Orientation imaging microscopy (OIM) was utilized to follow the progression of grain refinement and texture as a function of imposed SPD. Local orientation based misorientation gradients helped to perform statistical boundary analysis and determine the fractions of incidental and geometrically necessary dislocation (GND) boundaries and local GND densities. From probability density distributions of the misorientation gradients two different stages of microstructural evolution, namely, fragmentation and saturation, could be discerned. The strength increased monotonously and the uniform elongation, though lower than the value of the annealed material, enhanced with the imposed strain in HPT. The post-necking response was observed to be highly microstructure dependent, where a lower grain size augmented the resistance for micro-crack propagation and enhanced the elongation-to-failure. In addition, the work hardening response corresponding to the yield point displayed maxima coinciding with the onset of the saturation stage. Anisotropy in fracture strain, observed between the axial and radial directions in a disk-like HPT sample, reduced with the randomization of shear texture, while higher intensities of the C {100}<110> orientation was considered responsible for the lower elongation-to-failure along the radial direction.

KW - Commercial purity aluminum

KW - High pressure torsion

KW - Micro-texture

KW - Statistical boundary analysis

KW - Tensile properties

KW - Work hardening

UR - http://www.scopus.com/inward/record.url?scp=85070107633&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2019.138195

DO - 10.1016/j.msea.2019.138195

M3 - Article

VL - 764

JO - Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing

JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing

SN - 0921-5093

M1 - 138195

ER -

ID: 56125502