Depth Dependence of Nanoindentation Pile-Up Patterns in Copper Single Crystals

Kucharski, S.; Jarząbek, Dariusz M.

doi:10.1007/s11661-014-2437-4

Cited by 34 publications

(17 citation statements)

References 22 publications

(41 reference statements)

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“…We tentatively attribute this effect to different mechanisms and modes of deformation that take place at low (down to hundred nanometers) and large (few hundreds nanometers) penetration depths, as it has been mentioned at the end of BSpecification of the Contact Area with Use of Post-Mortem Method^section, c.f. [41]. This effect can be explained by the fact, that for the lowest loads the motion of dislocations is rather random and is not restrained by the slip planes.…”

Section: Comparison Of Hardness Values Specified With Different Methodsmentioning

confidence: 97%

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Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

et al. 2015

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In the present study, we report a detailed investigation of the unusual size effect in single crystals. For the experiments we specified the hardness in single crystalline copper specimens with different orientations ( (001), (011) and (111)) using Oliver-Pharr method. Our results indicates that with decreasing load, after the value of the hardness reached its maximum, it starts to decrease for very small indentation depths (<150 nm). For the sake of accuracy of hardness determination we have developed two AFM-based methods to evaluate contact area between tip and indented material. The proposed exact measurement of the contact area, which includes the effect of pile-up and sink-in patterns, can partially explain the strange behaviour, however, the decrease of hardness at low loads is still observed. At higher loads range the specified hardness is practically constant.

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Section: Comparison Of Hardness Values Specified With Different Methodsmentioning

confidence: 97%

“…The evolution of the surface topography in the vicinity of residual imprints shown schematically in Fig. 8, was presented more in detail in [41]. In that work the evolution of pile-ups patterns for different directions of indentation performed with Berkovich tip and for large range of loads was studied.…”

Section: ~620 Nmmentioning

confidence: 99%

Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

et al. 2015

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“…It has been demonstrated that different materials can be differently deformed in the proximity of the contact point. Therefore, these deformations cannot be correlated to the applied load but only to the intrinsic material properties [50]. …”

Section: Working Principles and Basic Toolsmentioning

confidence: 99%

Atomic Force Microscopy: A Powerful Tool to Address Scaffold Design in Tissue Engineering

Marrese

Guarino

Ambrosio

2017

JFB

107

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Functional polymers currently represent a basic component of a large range of biological and biomedical applications including molecular release, tissue engineering, bio-sensing and medical imaging. Advancements in these fields are driven by the use of a wide set of biodegradable polymers with controlled physical and bio-interactive properties. In this context, microscopy techniques such as Atomic Force Microscopy (AFM) are emerging as fundamental tools to deeply investigate morphology and structural properties at micro and sub-micrometric scale, in order to evaluate the in time relationship between physicochemical properties of biomaterials and biological response. In particular, AFM is not only a mere tool for screening surface topography, but may offer a significant contribution to understand surface and interface properties, thus concurring to the optimization of biomaterials performance, processes, physical and chemical properties at the micro and nanoscale. This is possible by capitalizing the recent discoveries in nanotechnologies applied to soft matter such as atomic force spectroscopy to measure surface forces through force curves. By tip-sample local interactions, several information can be collected such as elasticity, viscoelasticity, surface charge densities and wettability. This paper overviews recent developments in AFM technology and imaging techniques by remarking differences in operational modes, the implementation of advanced tools and their current application in biomaterials science, in terms of characterization of polymeric devices in different forms (i.e., fibres, films or particles).

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“…Moreover, topographic measurements taken with a scanning tunnelling microscope revealed a significantly higher pile-up on the (100) surface compared with the other two planes tested, namely (110) and (111). Wang et al [14] and Kucharski et al [15] reported an out-of-plane displacement mechanism on the primary slip plane on indentations performed with a conical and Berkovich indenter, respectively. Their experimental data concluded that at low loads, the angular position of the pile-up patterns first correspond with the tip geometry and as the load is increased, the position rotates about the indentation axis until at sufficiently deep indentation depths, the symmetry of the pile-up patterns correspond with the crystallographic orientation of the indented surface, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…the 101 , 011 and 110 directions on a (111) surface. Surprisingly, although it is typically accepted that the sinking-in deformation mode is predominant in materials with a high strain hardening behaviour [16], such as the copper studied by Wang et al [14] and Kucharski et al [15], the occurrence of sinking-in was not reported in these studies, instead, the piling-up of material was explained [14] by the rather small local strain hardening resulting from the activation of only a small set of slip systems that accounts for most of the local deformation.…”

Section: Introductionmentioning

confidence: 99%

The influence of the indentation size in relation to the size of the microstructure of three polycrystalline materials indented with a Berkovich indenter

Iracheta

Bennett

Sun

2017

Materials Science and Engineering: A

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Three different polycrystalline materials, a fine-grained martensitic steel (CrMoV), a coarsegrained high-purity copper (C110), and a two-phase microstructure titanium alloy (Ti-6Al-4V), have been selected to investigate the heterogeneity of deformation following indentation using a depth-sensing indentation instrument fitted with a Berkovich indenter. The geometry of the pile-up profiles, measured with an atomic force microscope, were observed to be very sensitive to the indentation size with respect to the size of the microstructure and the material properties and crystallographic plane of the indented grain. In contrast, neither the recovery of the area of indentation nor the degree of piling-up were affected by the presence of indentation size effects (ISE). Furthermore, based on the results of a full-3D finite element simulation, it was concluded that the misalignment of the indenter alone does not explain the significantly asymmetric piling-up in highly anisotropic materials, e.g. C110 copper, but that this is due to the crystallographic orientation of the single grain tested. In addition, the experimental results revealed that, although a thicker mechanically hardened layer formed during polishing is more prone to recovery during unloading, leading to a smaller residual indented area, the degree of piling-up is unaffected provided that the ratio of maximum depth (h max ) to the thickness of the strain-hardened layer is above unity. Moreover, on the same premise, the surface roughness and the thickness of the strain-hardened layer can be discarded as length parameters affecting hardness measurements.

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Depth Dependence of Nanoindentation Pile-Up Patterns in Copper Single Crystals

Cited by 34 publications

References 22 publications

Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

Atomic Force Microscopy: A Powerful Tool to Address Scaffold Design in Tissue Engineering

The influence of the indentation size in relation to the size of the microstructure of three polycrystalline materials indented with a Berkovich indenter

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