Size effect on mechanical behavior of Al/Si3N4 multilayers by nanoindentation

Wang, M.; Wang, D.; Kups, Thomas; Schaaf, Peter

doi:10.1016/j.msea.2015.07.071

Cited by 18 publications

(4 citation statements)

References 74 publications

(71 reference statements)

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“…The localization of deformation can be strong enough to sever the hard ceramic layers. Similar observations were made in other metal-ceramic nanolayered materials (Wang et al, 2015). This phenomenon has not surfaced in the previous finite element models associated with elastic-perfect-plasticity.…”

Section: Introductionsupporting

confidence: 87%

Indentation-Induced Shear Band Formation in Thin-Film Multilayers

Bigelow

Shen

2017

Front. Mater.

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We report an exploratory investigation into the cause of shear band formation in multilayer thin films subject to nanoindentation. The material system considered here is composed of alternating aluminum (Al) and silicon carbide (SiC) nanolayers, atop a silicon (Si) substrate. Finite element models are developed in an attempt to reproduce the shear banding phenomenon observed experimentally. By introducing strain softening into the material model for the hard SiC layers, shear bands can be seen to emerge from the indentation site in the finite element analysis. Broad implications, along with possible directions for future work, are discussed.

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Section: Introductionsupporting

confidence: 87%

Indentation-Induced Shear Band Formation in Thin-Film Multilayers

Bigelow

Shen

2017

Front. Mater.

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“…Therefore, in the present study, measurement position of the indenter was averaged to be 1/10 spot of the total film thickness to exclude the indentation size effects which show a tendency toward an increase in the measured hardness value, the shallower the indentation depth for nano-indentation hardness measurements. [21][22] As a function of asymmetric bipolar pulse plasma coating conditions, nano-indentation hardness and elastic modulus of NbN coatings can be affirmed to be increased in the order of the condition 1 to the condition 4. Namely, nano-indentation hardness and elastic modulus of the NbN coatings produced under the condition 4 were about 17.4 GPa and 193.9 GPa , respectively, showing an increase by about 30% for hardness and by up to 20% for elastic modulus, as compared with about 12.5 GPa and 155.5 GPa, respectively, for the coatings produced under the condition 1.…”

Section: Nano Hardness and Elastic Modulusmentioning

confidence: 92%

Crystal Structure, Microstructure and Mechanical Properties of NbN Coatings Deposited by Asymmetric Bipolar Pulsed DC Sputtering

Chun¹,

Im²

2017

J. Korean Ceram. Soc

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Single phase niobium nitride (NbN) coatings were deposited using asymmetric bipolar pulsed dc sputtering by varying pulse frequency and duty cycle of pulsed plasmas. Crystal structure, microstructure, morphology and mechanical properties were examined using XRD, FE-SEM, AFM and nanoindentation. Upon increasing pulse frequencies and decreasing duty cycles, the coating morphology was changed from a pyramidal-shaped columnar structure to a round-shaped dense structure with finer grains. Asymmetric bipolar pulsed dc sputtered NbN coatings deposited at pulse frequency of 25 kHz is characterized by higher hardness up to 17.4 GPa, elastic modulus up to 193.9 GPa, residual compressive stress and a smaller grain size down to 27.5 nm compared with dc sputtered NbN coatings at pulse frequency of 0 kHz. The results suggest that the asymmetric bipolar pulsed dc sputtering technique is very beneficial to reactive deposition of transition-metal nitrides such as NbN coatings.

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“…Later they applied this model into ABAQUS to conduct the simulation of the soft punch stamping process and compare with the actual experimental result [29]. Size effect related material behaviors include the mechanical behavior [30], fracture behavior [31], flow behavior, elastic recovery, fatigue strength [32], surface roughening, and the properties of micro-formed parts [33]. Size effect in indentation is mainly related to indentation size effect, which manifests the increase of hardness when the indentation size is reduced [34].…”

Section: Introductionmentioning

confidence: 99%