$Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction$
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Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction

In this study, we investigated the mechanism of the indentation size effect based on measurement of the geometrically necessary (GN) dislocation density. The GN dislocation density was measured around impressions by electron backscatter diffraction (EBSD). Indentation tests were performed for two ty...

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Autores principales:	Shota HASUNUMA, Hirohisa MIYAZAKI, Kensuke SHIMADA, Takeshi OGAWA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	indentation tests indentation size effect geometrically necessary dislocation electron backscatter diffraction indenter shape Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/2ed57b25127b40768360b0d9bf6081b7
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spelling	oai:doaj.org-article:2ed57b25127b40768360b0d9bf6081b72021-11-26T07:16:02ZInvestigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction2187-974510.1299/mej.17-00638https://doaj.org/article/2ed57b25127b40768360b0d9bf6081b72018-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/2/5_17-00638/_pdf/-char/enhttps://doaj.org/toc/2187-9745In this study, we investigated the mechanism of the indentation size effect based on measurement of the geometrically necessary (GN) dislocation density. The GN dislocation density was measured around impressions by electron backscatter diffraction (EBSD). Indentation tests were performed for two types of single crystal Ni with different crystal orientations: (001) and (111). Difference between (111) and (001) orientation are small in the relationship of the hardness and the penetration depth. However, the deformation behavior and distribution of the GN dislocation density are different for the (001) and (111) orientations. For the (111) orientation, the GN dislocation density increases with decreasing hardness. However, the GN dislocation density for the (001) orientation increases with increasing hardness. The mechanism of the indentation size effect for the (001) orientation can be attributed to the increase of the GN dislocation density. In addition, we investigated the effect of the indenter shape on the indentation size effect. Indentation tests were performed with different apex angles. The hardness using an indenter with a large apex angle is smaller than that using an indenter with a small apex angle. The GN dislocation density increases with decreasing apex angle. The mechanism of the indentation size effect for the apex angle can be attributed to the increase of the GN dislocation density. We prepared another indenter with a dull tip. The hardness using the dull indenter is larger than that using the sharp indenter. The GN dislocation density distribution changes with the indenter sharpness but the GN dislocation density is similar. For the dull indenter, variation of the GN dislocation density has a smaller effect on the indentation size effect than the increase of the resistance because of the different indenter shape.Shota HASUNUMAHirohisa MIYAZAKIKensuke SHIMADATakeshi OGAWAThe Japan Society of Mechanical Engineersarticleindentation testsindentation size effectgeometrically necessary dislocationelectron backscatter diffractionindenter shapeMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 2, Pp 17-00638-17-00638 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	indentation tests indentation size effect geometrically necessary dislocation electron backscatter diffraction indenter shape Mechanical engineering and machinery TJ1-1570
spellingShingle	indentation tests indentation size effect geometrically necessary dislocation electron backscatter diffraction indenter shape Mechanical engineering and machinery TJ1-1570 Shota HASUNUMA Hirohisa MIYAZAKI Kensuke SHIMADA Takeshi OGAWA Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction
description	In this study, we investigated the mechanism of the indentation size effect based on measurement of the geometrically necessary (GN) dislocation density. The GN dislocation density was measured around impressions by electron backscatter diffraction (EBSD). Indentation tests were performed for two types of single crystal Ni with different crystal orientations: (001) and (111). Difference between (111) and (001) orientation are small in the relationship of the hardness and the penetration depth. However, the deformation behavior and distribution of the GN dislocation density are different for the (001) and (111) orientations. For the (111) orientation, the GN dislocation density increases with decreasing hardness. However, the GN dislocation density for the (001) orientation increases with increasing hardness. The mechanism of the indentation size effect for the (001) orientation can be attributed to the increase of the GN dislocation density. In addition, we investigated the effect of the indenter shape on the indentation size effect. Indentation tests were performed with different apex angles. The hardness using an indenter with a large apex angle is smaller than that using an indenter with a small apex angle. The GN dislocation density increases with decreasing apex angle. The mechanism of the indentation size effect for the apex angle can be attributed to the increase of the GN dislocation density. We prepared another indenter with a dull tip. The hardness using the dull indenter is larger than that using the sharp indenter. The GN dislocation density distribution changes with the indenter sharpness but the GN dislocation density is similar. For the dull indenter, variation of the GN dislocation density has a smaller effect on the indentation size effect than the increase of the resistance because of the different indenter shape.
format	article
author	Shota HASUNUMA Hirohisa MIYAZAKI Kensuke SHIMADA Takeshi OGAWA
author_facet	Shota HASUNUMA Hirohisa MIYAZAKI Kensuke SHIMADA Takeshi OGAWA
author_sort	Shota HASUNUMA
title	Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction
title_short	Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction
title_full	Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction
title_fullStr	Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction
title_full_unstemmed	Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction
title_sort	investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/2ed57b25127b40768360b0d9bf6081b7
work_keys_str_mv	AT shotahasunuma investigationoftheindentationsizeeffectbasedonmeasurementofthegeometricallynecessarydislocationdensitybyelectronbackscatterdiffraction AT hirohisamiyazaki investigationoftheindentationsizeeffectbasedonmeasurementofthegeometricallynecessarydislocationdensitybyelectronbackscatterdiffraction AT kensukeshimada investigationoftheindentationsizeeffectbasedonmeasurementofthegeometricallynecessarydislocationdensitybyelectronbackscatterdiffraction AT takeshiogawa investigationoftheindentationsizeeffectbasedonmeasurementofthegeometricallynecessarydislocationdensitybyelectronbackscatterdiffraction
_version_	1718409709115932672

Investigation of the indentation size effect based on measurement of the geometrically necessary dislocation density by electron backscatter diffraction

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