Results 261 to 270 of about 75,619 (293)
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Size effects in micro- and nanoscale indentation
Acta Materialia, 2006Abstract The indentation size effect (ISE) has been studied in single crystals, polycrystals and amorphous solids using the Vickers microhardness test. The ISE is clearly present in single crystals but is absent in fine-grained polycrystals. A size-dependent hardness for amorphous solids is observed only in the sub-micrometre surface layer.
Ilze Manika, Janis Maniks
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A different type of indentation size effect
Scripta Materialia, 2008Pop-in during nanoindentation, which indicates the onset of dislocation plasticity, was systematically investigated in annealed and pre-strained single crystals of nickel using spherical indenters with different tip radii. As the indenter radius and pre-strain decrease, the maximum shear stresses determined from the pop-in loads increase.
S. Shim, H. Bei, E.P. George, G.M. Pharr
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Indentation-size effects in single-crystal MgO
Philosophical Magazine A, 2002Abstract The microhardness values in many very hard materials need to be measured at low loads to prevent cracking from unduly affecting the measurement accuracy. However, the resultant indentation-size effect (ISE) means that it is difficult to compare the results obtained by different workers and for different specimens, particularly of small ...
X. J. Ren +3 more
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A fractal approach to indentation size effect
Engineering Fracture Mechanics, 2006Abstract In this paper, we propose an original interpretation of indentation size effect (ISE) in both single crystal and polycrystalline metals, which is based on the experimental evidence of the formation of fractal cellular dislocation patterns during the later stages of plastic deformation, in strain hardening metals, both under tensile loading ...
CARPINTERI, Alberto, PUZZI, SIMONE
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Indentation Size Effect during Measuring the Hardness of Materials by Spherical Indenter
Solid State Phenomena, 2020The work balance method was used to study the effect of the indenter diameter on the indentation size effect when measuring Brinell hardness. It is shown that the main criterion for the indentation size effect is the specific work of plastic deformation when an indenter is introduced. The conditions of indentation are established to ensure the smallest
Andrey A. Udalov +2 more
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Indentation size effect during measuring the hardness of materials by pyramidal indenter
Materials Today: Proceedings, 2019Abstract The influence of the indentation force on the manifestation of the indentation size effect when measuring Vickers hardness is investigated. It is shown that when introducing the Vickers pyramid, the deformation remains constant, and the main criteria for the indentation size effect are the resistance of the material to the deformation and ...
Andrei Udalov +2 more
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Indentation size effect in Ni–Fe solid solutions
Acta Materialia, 2007Abstract The indentation size effect observed during indentation testing is studied in pure Ni, Fe and two different Ni–Fe alloys as well as in a Ni–Fe diffusion couple. The hardness as a function of depth in these solid solutions is modeled in terms of geometrically necessary dislocations (GND).
K. Durst +3 more
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Influence of surface-roughness on indentation size effect
Acta Materialia, 2007During nanoindentation of a material with a naturally rough-surface, a flattening of the rough-surface is additionally accomplished compared to nanoindentation on a flat surface. By separating analytically the work expended to flatten the rough-surface and to deform the flattened surface, we develop here a new rough-surface indentation size effect (ISE)
Kim, Ju-Young +5 more
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A Fractal Approach Interpretation for the Indentation Size Effect
2008Since the 1950’s (Tabor [1]), the hardness measurements have been recognized to be size dependent; a hardness increase with decreasing indentation depth (or indenter size) is always observed. The indentation size effect (ISE) is extensively studied in the literature and research in this field has been continuously growing in the last decades; this is ...
CARPINTERI, Alberto, PUZZI, SIMONE
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Indentation size effect on the Fe2B/substrate interface
Surface and Coatings Technology, 2011Abstract This study evaluated the indentation size effect on the Fe 2 B/substrate interface using the Berkovich nanoindentation technique. First, the Fe 2 B layers were obtained at the surface of AISI 1018 borided steels by the powder-pack boriding method.
I. Campos-Silva +5 more
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