Modification of composite hardness models to incorporate indentation size effects in thin films

Beegan, D.; Chowdhury, S.; Laugier, M. T.

doi:10.1016/j.tsf.2007.06.140

Cited by 23 publications

(18 citation statements)

References 28 publications

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“…The evaluation of the coating hardness using noisy experimental results remains acceptable whether the diamond penetration depth is weak or strong. This result is contrary to the assertions generally found in the bibliography, which state that the JH model gives a poor fit when the indentation depth is shallower than the coating thickness or at the substrate-dominated end [14,15,[17][18][19][31][32][33]. This contradiction is due to an incorrect use of the model by these authors.…”

Section: Resultscontrasting

confidence: 78%

“…As underlined in the model presentation, it is necessary to take into account the hardness variation of the load without any simplifying hypotheses. Korsunsky et al [17,18] and Beegan et al [33] claim that this model is observed to break down when tested outside the range of experimental values. We show in a recent paper [34] that this affirmation is related to an erroneous application of this model, which is in contradiction to its physical meaning.…”

Section: Resultsmentioning

confidence: 97%

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A comparison of models for predicting the true hardness of thin films

et al. 2012

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Section: Resultscontrasting

confidence: 78%

Section: Resultsmentioning

confidence: 97%

A comparison of models for predicting the true hardness of thin films

et al. 2012

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“…Different reasons of this effect have been suggested depending on the structure of material. ISE was extensively investigated in terms of geometrically necessary dislocations and strain gradient plasticity for single-crystalline and polycrystalline materials [36][37][38], shear transformation zones and straininduced softening for metallic glasses [39], and effect of fracture on hardness for brittle materials like ceramics [40]. From more general aspect, the ISE was explained in term of energy balance consideration [40], friction between indenter and specimen characterized as surface-area-tovolume ratio [39], and contact dissipation energy associated with micro-scale asperities on the contact surface [41].…”

Section: Resultsmentioning

confidence: 99%

Densification contribution as a function of strain rate under indentation of terbium-doped aluminophosphate glass

et al. 2015

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In this work, the strain rate effect on the deformation processes under Berkovich indentation of Tbdoped aluminophosphate glass has been investigated. It is shown that both densification and shear flow, adopted as main mechanisms of plastic deformation for oxide glasses, are strain rate sensitive. Moreover, the shear flow is assumed to be responsible for the strain rate sensitivity of densification. The densification contribution to the total plastic deformation is found to be greater for lower strain rate, and the same tendency is observed for the plastic flow. This, in turn, leads to the influence of the strain rate on the hardness values, manifesting as a softening of the glassy matrix with the decrease of strain rate caused by more intensive development of the densification and shear flow. The decrease of hardness with load increase is attributed to the involving and increasing contribution of the shear flow and fracture to the total deformation process.

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“…One of the most important mechanical characteristics of metal films and coatings is microhardness, which is closely dependent on processing parameters used for their production [22,23]. Examining the mechanical response of a composite system constructed from substrate and film or coating on indentation and estimating the absolute film hardness independently from the substrate hardness include knowledge of parameters and phenomena such as type of the composite system [24], applied load, duration of the applied load at indentation (dwell time) and indentation depth [25,26], thickness of the coatings [27], elastic properties of the coatings [28], indentation size effect (ISE) [29][30][31][32], interfacial adhesion [33,34], etc. A large number of mathematical composite models have been developed so far to determine the "true" or absolute hardness of the film [27,[32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Morphology, Structure and Mechanical Properties of Copper Coatings Electrodeposited by Pulsating Current (PC) Regime on Si(111)

Mladenović

Lamovec

Radović

et al. 2020

Metals

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Copper electrodeposition on (111)-oriented Si substrate was performed by the pulsating current (PC) regime at various average current densities in the range of 15-70 mA·cm −2 , obtained by varying either the frequency (30, 50, 80 and 100 Hz for the current density amplitude of 100 mA·cm −2 ) or the current density amplitude (120 and 140 mA·cm −2 at 100 Hz). The produced Cu coatings were examined by SEM, AFM and XRD techniques. The morphology of the coatings changed from those with large grains to fine-grained and globular, while the crystal structure changed from the strong (220) to the strong (111) preferred orientation by increasing the average current density. The mechanical characteristics of coatings were examined using Vickers micro-indentation tests, applying the Chicot-Lesage (C-L) composite hardness model for the analysis of microhardness. The maximum microhardness was obtained for the Cu coating produced at an average current density of 50 mA·cm −2 , with a current density amplitude of 100 mA·cm −2 and a frequency of 100 Hz. This copper coating was fine-grained and showed the smallest roughness in relation to the other coatings, and it was obtained in the mixed activation-diffusion control between the end of the effect of the activation control and the beginning of the dominant effect of diffusion control.

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Modification of composite hardness models to incorporate indentation size effects in thin films

Cited by 23 publications

References 28 publications

A comparison of models for predicting the true hardness of thin films

A comparison of models for predicting the true hardness of thin films

Densification contribution as a function of strain rate under indentation of terbium-doped aluminophosphate glass

Morphology, Structure and Mechanical Properties of Copper Coatings Electrodeposited by Pulsating Current (PC) Regime on Si(111)

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