Surface topography affects the nanoindentation data

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F22%3APU146120" target="_blank" >RIV/00216305:26310/22:PU146120 - isvavai.cz</a>

Alternative codes found

RIV/68081731:_____/22:00557264

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0040609022000268" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0040609022000268</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.tsf.2022.139105" target="_blank" >10.1016/j.tsf.2022.139105</a>

Result language

angličtina

Original language name

Surface topography affects the nanoindentation data

Original language description

The near-surface mechanical properties of thin films as well as bulk materials are among the key parameters important for their application, and instrumented nanoindentation is a standard technique for determining these mechanical properties. However, it is known that the surface topography of the characterized materials may affect the nanoindentation data when a sharp indenter for small penetration depths (displacements) is used. A thin film of hydrogenated amorphous silicon carbide with a thickness of 1.0 μm was deposited on a silicon wafer by plasma-enhanced chemical vapour deposition. The cyclic nanoindentation was used to construct a depth profile of mechanical properties for the flat surface (0.5 nm roughness) of the thin film, which made it possible to determine its modulus of elasticity of 83 GPa and hardness of 8.6 GPa unaffected by the silicon substrate. Grains with a spherical cap geometry with a typical radius of 0.5 µm and a height of 60 nm are distributed along the flat surface of the film. The grains have the same mechanical properties as the deposited film. Depth profiles of mechanical properties were determined for different types of contact between the Berkovich indenter with a radius of 50 nm and the selected grain (grain top, grain foot, two or three grains); i.e. for these measurements the following applied - the radius of the tip curvature was less than grain radii (RBerkovich < Rgrain). Residual imprints after nanoindentation measurements were carefully observed by atomic force microscopy and scanning electron microscopy. The near-surface mechanical properties were significantly affected by the surface topography, and the determined modulus of elasticity and hardness were crucially under- or overestimated in the range of 50% to 100% compared to the real values. The nature of these deviations was discussed. The solution is to use cyclic nanoindentation performed on the flat surfaces or on the top of grains, followed by extrapolation of the dept

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20506 - Coating and films

Project

<a href="/en/project/GA16-09161S" target="_blank" >GA16-09161S: Synthesis of multifunctional plasma polymers for polymer composites without interfaces</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Thin Solid Films

ISSN

0040-6090

e-ISSN

—

Volume of the periodical

745

Issue of the periodical within the volume

139105

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

7

Pages from-to

1-7

UT code for WoS article

000784446100005

EID of the result in the Scopus database

2-s2.0-85123347297