Deformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique

Conventional engineering stress–strain curve could not accurately describe the local deformability of the tensile necking part because the strain is calculated by assuming that the tensile specimen was deformed uniformly. In this study, we used 3D optical measuring digital image correlation to syste...

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Autores principales:	Zhao Yonghao, Gu Yanglin
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	nanostructured metals plasticity plastic deformation mechanisms localized necking complex stress state Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801
Acceso en línea:	https://doaj.org/article/15e9ece99a324cc7b9b41b94c5c9d497
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id	oai:doaj.org-article:15e9ece99a324cc7b9b41b94c5c9d497
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spelling	oai:doaj.org-article:15e9ece99a324cc7b9b41b94c5c9d4972021-12-05T14:10:57ZDeformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique2191-909710.1515/ntrev-2021-0007https://doaj.org/article/15e9ece99a324cc7b9b41b94c5c9d4972021-03-01T00:00:00Zhttps://doi.org/10.1515/ntrev-2021-0007https://doaj.org/toc/2191-9097Conventional engineering stress–strain curve could not accurately describe the local deformability of the tensile necking part because the strain is calculated by assuming that the tensile specimen was deformed uniformly. In this study, we used 3D optical measuring digital image correlation to systematically measure the full strain field and actual flow stress in the necking region of ultrafine-grained (UFG) Al. The post-necking elongation and strain hardening exponent of the UFG Al were measured as 80% and 0.10, slightly smaller than those of the coarse-grained Al (117% and 0.28), suggesting the high plastic deformability of the UFG Al under complex stress state. Microstructural studies revealed the shear and ductile fracture, numerous micro-shear bands, and elongated UFG grains in the UFG Al, which are controlled by cooperative grain boundary sliding and multiple dislocation slips.Zhao YonghaoGu YanglinDe Gruyterarticlenanostructured metalsplasticityplastic deformation mechanismslocalized neckingcomplex stress stateTechnologyTChemical technologyTP1-1185Physical and theoretical chemistryQD450-801ENNanotechnology Reviews, Vol 10, Iss 1, Pp 73-86 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	nanostructured metals plasticity plastic deformation mechanisms localized necking complex stress state Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801
spellingShingle	nanostructured metals plasticity plastic deformation mechanisms localized necking complex stress state Technology T Chemical technology TP1-1185 Physical and theoretical chemistry QD450-801 Zhao Yonghao Gu Yanglin Deformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique
description	Conventional engineering stress–strain curve could not accurately describe the local deformability of the tensile necking part because the strain is calculated by assuming that the tensile specimen was deformed uniformly. In this study, we used 3D optical measuring digital image correlation to systematically measure the full strain field and actual flow stress in the necking region of ultrafine-grained (UFG) Al. The post-necking elongation and strain hardening exponent of the UFG Al were measured as 80% and 0.10, slightly smaller than those of the coarse-grained Al (117% and 0.28), suggesting the high plastic deformability of the UFG Al under complex stress state. Microstructural studies revealed the shear and ductile fracture, numerous micro-shear bands, and elongated UFG grains in the UFG Al, which are controlled by cooperative grain boundary sliding and multiple dislocation slips.
format	article
author	Zhao Yonghao Gu Yanglin
author_facet	Zhao Yonghao Gu Yanglin
author_sort	Zhao Yonghao
title	Deformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique
title_short	Deformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique
title_full	Deformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique
title_fullStr	Deformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique
title_full_unstemmed	Deformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique
title_sort	deformation mechanisms and plasticity of ultrafine-grained al under complex stress state revealed by digital image correlation technique
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/15e9ece99a324cc7b9b41b94c5c9d497
work_keys_str_mv	AT zhaoyonghao deformationmechanismsandplasticityofultrafinegrainedalundercomplexstressstaterevealedbydigitalimagecorrelationtechnique AT guyanglin deformationmechanismsandplasticityofultrafinegrainedalundercomplexstressstaterevealedbydigitalimagecorrelationtechnique
_version_	1718371524067459072

Deformation mechanisms and plasticity of ultrafine-grained Al under complex stress state revealed by digital image correlation technique

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