Influence of surface-roughness on indentation size effect

Kim, Ju‐Young; Kang, Seung‐Kyun; Lee, Jung-Jun; Jang, Jae-il; Lee, Yun-Hee; Kwon, Dongil

doi:10.1016/j.actamat.2007.02.006

Cited by 139 publications

(46 citation statements)

References 37 publications

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“…(15), suggesting that the average pileup height is slightly greater than that at the corners of the Vickers indenter.…”

Section: Discussionmentioning

confidence: 97%

“…The fundamental advantage of instrumented indentation testing (IIT) over conventional hardness testing is that mechanical properties such as elastic modulus, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] tensile properties, [16][17][18][19][20][21][22][23][24][25][26][27][28][29] and hardness can be measured by analyzing the indentation force-depth curve and without observing the residual indentation marks. However, elastoplastic deformation of materials around the indenter, i.e., plastic pileup or sink-in, [30][31][32][33][34][35][36][37] makes it difficult to determine the true contact depth in the loaded state.…”

Section: Introductionmentioning

confidence: 99%

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Conventional Vickers and true instrumented indentation hardness determined by instrumented indentation tests

et al. 2010

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We evaluate Vickers hardness and true instrumented indentation test (IIT) hardness of 24 metals over a wide range of mechanical properties using just IIT parameters by taking into account the real contact morphology beneath the Vickers indenter. Correlating the conventional Vickers hardness, indentation contact morphology, and IIT parameters for the 24 metals reveals relationships between contact depths and apparent material properties. We report the conventional Vickers and true IIT hardnesses measured only from IIT contact depths; these agree well with directly measured hardnesses within AE6% for Vickers hardness and AE10% for true IIT hardness.

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“…(15), suggesting that the average pileup height is slightly greater than that at the corners of the Vickers indenter.…”

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Conventional Vickers and true instrumented indentation hardness determined by instrumented indentation tests

et al. 2010

Self Cite

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“…However, numerous indentation studies have reported an increase in the hardness with decreasing depth of penetration, which is known as the indentation size effect. The causes of the indentation size effect are considered to be the radius of the indenter tip, roughness of the specimen surface, and so forth (Kim et al, 2007;Swadener et al, 2002). Miyahara et al (1998) proposed a method to determine the macrohardness from test results that include the indentation size effect.…”

Section: Introductionmentioning

confidence: 99%

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

Hasunuma

Miyazaki

Shimada

et al. 2018

Mechanical Engineering Journal

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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.

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“…Experimental artifacts such as pile-up, substrate effects, anisotropy, and delamination and/or microcracking can lead to errors in the interpretation of force-displacement curves measured during nanoindentation [38][39][40][41][61][62][63] . As detailed in 60 , pile-up was empirically evaluated and corrected using the in-situ scan images.…”

Section: Asymmetric Test Resultsmentioning

confidence: 99%

Micromechanics of Damage Accumulation in Micro- and Nano-Scale Laminates for Microelectromechanical Systems

Muhlstein¹

2009

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Influence of surface-roughness on indentation size effect

Cited by 139 publications

References 37 publications

Conventional Vickers and true instrumented indentation hardness determined by instrumented indentation tests

Conventional Vickers and true instrumented indentation hardness determined by instrumented indentation tests

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

Micromechanics of Damage Accumulation in Micro- and Nano-Scale Laminates for Microelectromechanical Systems

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