Nanomechanical Testing for Fracture of Oxide Films

Morasch, K. R.; Bahr, David F.

doi:10.1557/jmr.2005.0188

Cited by 13 publications

(3 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This abrupt change during loading can be connected to two phenomena: (1) the transition regime from elastic to elasto-plastic deformation of the material [31] or (2) the fracture of the oxide film due to the indentation stress intensity and the brittleness of the film [32][33][34]. In case 1, Hertz's theory represented by the power law: L¼ Kh 3/2 , where K is a parameter related to the elastic modulus, must be verified before the pop-in event.…”

Section: Indentation Experimentsmentioning

confidence: 99%

An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

Hemmouche¹,

Chicot²,

Amrouche³

et al. 2013

Materials Science and Engineering: A

View full text Add to dashboard Cite

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tThe elastic modulus of thin films can be directly determined by instrumented indentation when the indenter penetration does not exceed a fraction of the film thickness, depending on the mechanical properties of both film and substrate. When it is not possible, application of models for separating the contribution of the substrate is necessary. In this work, the robustness of several models is analyzed in the case of the elastic modulus determination of a porous aluminium oxide film produced by anodization of an aluminium alloy. Instrumented indentation tests employing a Berkovich indenter were performed at a nanometric scale, which allowed a direct determination of the film elastic modulus, whose value was found to be approximately 11 GPa. However, at a micrometric scale the elastic modulus tends toward the value corresponding to the substrate, of approximately 73 GPa. The objective of the present work is to apply different models for testing their consistency over the complete set of indentation data obtained from both classical tests in microindentation and the continuous stiffness measurement mode in nanoindentation. This approach shows the continuity between the two scales of measurement thus allowing a better representation of the elastic modulus variation between two limits corresponding to the substrate and film elastic moduli. Gao's function proved to be the best to represent the elastic modulus variation.

show abstract

Section: Indentation Experimentsmentioning

confidence: 99%

An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

Hemmouche¹,

Chicot²,

Amrouche³

et al. 2013

Materials Science and Engineering: A

View full text Add to dashboard Cite

show abstract

“…First, the localized surface Ta 2 O 5 scale can experience basic/acidic dissolution to form TaO 3 − or Ta 4 O 11 2− /Ta 5+ ions, and the reactions can generate a large number of volatile products, thus fracturing the corrosion scale and leading to the generation of defects in it, such as pores and cracks. Second, the transformation from Ta to oxides can cause a huge volume expansion; for example, based on the crystal parameters of Ta, Ta 2 O 5 , and Na–Ta–O, one Ta atom transforming to Ta 2 O 5 , NaTaO 3 , and Na 2 Ta 4 O 11 expands the volume by 2.59, 3.63, and 3.06 times, respectively, leading to a stress generated in the corrosion scale and at the Ta interface . As the scale thickness increases, the stress in the corrosion scale increases; thus, the corrosion scale breaks and detaches from the surface when the stress increases to a certain level (Figure e,f).…”

Section: Discussionmentioning

confidence: 99%

The effect of surface treatment on the corrosion behavior of a pure Ta sheet in an equimolar NaCl–KCl melt at 850°C in air. Part 1: Laser surface melting

Zeng

et al. 2019

Materials & Corrosion

View full text Add to dashboard Cite

The corrosion behavior of pure Ta and laser surface melting-treated Ta sheets was investigated in an equimolar NaCl-KCl melt at 850°C in air. The results show that the predominant factors involved in the consumption of materials were reactions that form sodium-containing oxides and Ta 2 O 5 . High corrosion stress led to slip of the untreated Ta surface grains, further resulting in preferential corrosion along slip bands. The slip of surface grains substantially deteriorated the bonding between the corrosion scale and matrix, thus leading to rapid degradation of the corrosion scale. The melt layer consisted of a thin Ta 2 O 5 film, and the inner dendrite layer demonstrated self-healing characteristics during corrosion and presented a better hot corrosion resistance than the untreated Ta owing to the excellent bonding at the scale and melt layer interface. K E Y W O R D S chloride, hot corrosion, LSM, oxidation, Ta

show abstract

“…Shi et al [3] revealed the mechanical properties and deformation mechanism of gold nanowires under different strain rates by the molecular dynamics method. Morasch et al [4] tested the mechanical properties of oxide films by nano-indentation, and obtained the stress intensity at the fracture point. Kim et al [5] proved that the compression on sulfide film containing residual compressive stress could improve the elastic modulus of the film and increase the fracture resistance.…”

Section: Introductionmentioning

confidence: 99%

Fracture behaviour of silver nanowire films during shear deformation

Wang¹,

Ma²,

Shi³

et al. 2022

Nanotechnology

View full text Add to dashboard Cite

Silver nanowire films have a wide application prospect in flexible electronics, while it is a noticeable problem that the silver nanowires break due to the shear force under the mass production film cutting or extreme service conditions. In this paper, the shear fracture behaviour of silver nanowire films with different structural parameters was studied under the extreme shear failure tests. The load-displacement curve was obtained from the nano-indentation test, while the hardness H, the elastic modulus E and the plastic properties represented by the ratio of H3/E2 of silver nanowire films with different diameters and thicknesses were calculated. On the other hand, based on the load-displacement curve, the stress-strain curve can be obtained through the finite element method simulation. The plastic properties can also be judged by the lower limit of yield strength from simulated stress-strain curve. Combined with characteristic crack propagation range, the relationship between plasticity and shear fracture was found, which was further disclosed by in-depth microstructure analysis. The results show that the better the plasticity of silver nanowire films, the stronger the resistance to shear fracture.

show abstract

Nanomechanical Testing for Fracture of Oxide Films

Cited by 13 publications

References 19 publications

An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

An analysis of the elastic properties of a porous aluminium oxide film by means of indentation techniques

The effect of surface treatment on the corrosion behavior of a pure Ta sheet in an equimolar NaCl–KCl melt at 850°C in air. Part 1: Laser surface melting

Fracture behaviour of silver nanowire films during shear deformation

Contact Info

Product

Resources

About