Critical review of analysis and interpretation of nanoindentation test data

Fischer-Cripps, A. C.

doi:10.1016/j.surfcoat.2005.03.018

Cited by 654 publications

(350 citation statements)

References 31 publications

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“…Similar shape of the contact boundary for fused silica was detected with use of the post-mortem method proposed in [24]. The measurement of residual imprints to estimate the contact area was advised also in [39].…”

Section: Specification Of the Contact Area With Use Of Post-mortem Mementioning

confidence: 68%

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: Specification Of the Contact Area With Use Of Post-mortem Mementioning

confidence: 68%

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

et al. 2015

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“…The Hertzian analysis is well suited to the nano-scratch testing of DLC films with spherical probes with an end radius of 5 µm or greater due to their intrinsic low friction and high H/E so that contact remains elastic or close to it over a wide load range. Plastic deformation in the sample beneath a spherical indenter can be first expected to occur when P m ~1.1Y at a depth of ~0.47a [24,29,30]. The mean pressure at yield (P m ) has been converted to a yield stress, Y, using the relationship that Y = P m /1.1.…”

Section: Nano-scratch Behaviour (R = 5 M)mentioning

confidence: 99%

Development of DLC coating architectures for demanding functional surface applications through nano- and micro-mechanical testing

Beake

Liskiewicz

Vishnyakov

et al. 2015

Surface and Coatings Technology

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DLC coatings can combine high hardness with low friction. However, they are often deposited with high levels of intrinsic stress and display low adhesion strength resulting in poor performance in demanding applications. A highly topical challenge is to develop advanced DLC coatings capable of withstanding more demanding applications in the automotive, cutting tools, MEMS and oil and gas sectors. The results from several nanomechanical and tribological test techniques -nanoindentation, nano-scratch and nanofretting (nano-wear) -can be used together to aid the design of DLC coating architectures for enhanced durability in specific applications. In this study the behaviour of multilayered DLC coatings (Cr/W-C:H/a-C:H, Cr/W-C:H/Si-a-C:H) was compared to that of CrN/a-C:H:W (WC/C). We have previously reported that in nano-wear tests the coating with the highest hardness and H/E displayed greater wear resistance [T.W. Liskiewicz et al, Surf. Coat.Technol. 237 (2013) 212]. By employing nano-and micro-scale tribological testing with probes of differing sharpness it is possible to change the sensitivity of the test to probe the response of the coating top layer or the entire multilayer coating-substrate system. In the nano-scratch tests using a spherical indenter with a 5 m end radius the maximum stresses are located well within the top layer of the multilayer coatings and consequently the mechanical properties of this top layer dominate the nano-tribological behaviour. In the micro-scratch using a 25 m spherical probe the stress field extends further towards the sublayers and steel substrate and consequently the behaviour is completely different. Under these conditions the coating with the lowest hardness and H/E showed improved performance with higher critical loads for cracking and total coating failure. High resolution SEM imaging has been used to investigate this further. A simple contact model strongly suggests that cracking and failure events occur on the harder coatings when the maximum von Mises stress was located close to the interfaces in the multilayer systems.3

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“…However, a drawback of the indentation test, if the objective is to identify bulk material properties, is its sensitivity to low scale artefacts such as sensor sensitivity, surface roughness, imperfect indenter geometry, and material heterogeneity [13][14][15][16][17][18][19]. These artefacts, independently from the assumptions on the bulk material behaviour, lead to deviations from the ideal F-h curve predicted by the identification models based on Eq.2.…”

Section: Introductionmentioning

confidence: 99%

“…However, if initial contact, i.e. zero penetration depth, is detected by the indentation device by a sharp rise of load [15,19], the penetration depth for a given load will show an offset h offset,R from the penetration depth measured in the case of a perfectly smooth surface, corresponding to the compression of the asperities [7,14], such as presented schematically in Fig.1. Moreover, this offset as well as the necessary load for the compression of asperities is dependent on material properties, surface roughness, and the point of initial contact, i.e.…”

Section: Introductionmentioning

confidence: 99%

An alternative to the determination of the effective zero point in instrumented indentation: Use of the slope of the indentation curve at indentation load values

Brammer¹,

Bartier²,

Hernot³

et al. 2012

Materials & Design

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Most identification models based on instrumented indentation rely on the knowledge of the indentation load-penetration depth curve corresponding to the bulk material. Experimentally, and especially in the case of micro and nanoindentation testing, the measured curve can be affected by low scale artefacts such as sensor sensitivity, surface roughness, imperfect indenter tip geometry and material heterogeneity, leading to incorrect identifications of the indented material's bulk mechanical properties. This work proposes an exploitation of identification models which is based on the slope of the indentation curve at indentation load values and provides accurate results which are not affected by low scale artefacts.

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Critical review of analysis and interpretation of nanoindentation test data

Cited by 654 publications

References 31 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

Development of DLC coating architectures for demanding functional surface applications through nano- and micro-mechanical testing

An alternative to the determination of the effective zero point in instrumented indentation: Use of the slope of the indentation curve at indentation load values

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