An In Situ Method for Simultaneous Friction Measurements and Imaging of Interfacial Tribochemical Film Growth in Lubricated Contacts

Gosvami, Nitya Nand; Ma, Jun; Carpick, Robert W.

doi:10.1007/s11249-018-1112-0

Cited by 40 publications

(27 citation statements)

References 40 publications

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“…The silicon cantilever (Tap190AlG, Budgetsensors) was used to perform the experiments. The tip of the cantilever is very sharp and can easily become blunt at higher load, therefore to overcome this problem, the cantilever was modified by attaching a highly wear resistant alumina sphere of diameter 20 µm at the end of the cantilever [14]. Large diameter of alumina sphere reduces the contact pressure and hence prevents wear [14].…”

Section: Atomic Force Microscopementioning

confidence: 99%

“…To calibrate the normal and lateral force spring constant, Sadar [15] and Green [16] method was used, respectively. The normal and lateral sensitivity was calculated by using the linear part of the normal and lateral force vs distance plot, respectively [14,16]. The contact radius and mean contact pressure for the normal load range (31-64 µN) was varied between 0.17 -0.22 µm and 0.32 -0.38 GPa respectively by considering the Young modulus value of AZ91 magnesium alloy and alumina as 45 GPa and 300 GPa respectively.…”

Section: Atomic Force Microscopementioning

confidence: 99%

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Effect of grain orientation on friction and wear behavior of AZ91 magnesium alloy

Kumar

2021

Lett. Mater.

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Because of the light weight of magnesium, it has got potential applications in automobile industry. But magnesium has many limitations and due to that it cannot be used directly as a replacement of aluminium and steel. In past, different alloys of magnesium have been developed to overcome the limitations of magnesium without losing other physical and mechanical properties. One of the most important magnesium alloys is AZ91, which gives better properties than magnesium. In the present investigation, commercially available rectangular block of as cast AZ91 magnesium alloy of size 10 ×10 ×10 mm 3 was heat treated at 390°C for 48 h in air and then water quenched to dissolve all the precipitates into matrix. Electron back scattered diffraction (EBSD) analysis of heat-treated sample was done on a field emission scanning electron microscope to know the crystallographic orientations of the individual grains present in the heat treated AZ91 magnesium alloy. Hardness and scratch resistance for the three different crystallographic orientations such as basal, prismatic and pyramidal orientations of AZ91 magnesium alloy grains was measured using an universal nanomechanical tester having Berkovich diamond indenter. Hardness and scratch resistance are found to vary with the variation in crystallographic orientations of the grains. Further wear resistance of these three different grains having basal, prismatic and pyramidal orientations, respectively were measured by atomic force microscopy and correlated with their measured hardness value.

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Section: Atomic Force Microscopementioning

confidence: 99%

Section: Atomic Force Microscopementioning

confidence: 99%

Effect of grain orientation on friction and wear behavior of AZ91 magnesium alloy

Kumar

2021

Lett. Mater.

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“…(Figure 5a). 57 A single-asperity contact is formed between an AFM tip and a flat sample submerged in a conventional AFM liquid cell containing the lubricant. Alternatively, multi-asperity contacts can be formed by using a rough microscale colloidal tip.…”

Section: Tribochemical Buildup and Removal Of Antiwear Additivesmentioning

confidence: 99%

“…Alternatively, multi-asperity contacts can be formed by using a rough microscale colloidal tip. 57 Applied force, sliding velocity, and temperature can be varied, and thus nucleation and growth of tribofilms are mapped in real-time against shear rate, stress, and temperature. Gosvami et al 20 heated the ZDDP-containing polyalphaolefin oil to 80-140°C during sliding experiments, which were performed for a range of normal loads.…”

Section: Tribochemical Buildup and Removal Of Antiwear Additivesmentioning

confidence: 99%

Insights into tribology from in situ nanoscale experiments

et al. 2019

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“…However, atomic force microscope (AFM) based friction force microscopy (FFM) was recently used to identify the growth rate of a ZDDP film in situ while undergoing friction stimulation. [20] This topographic measurement concurrent with friction is therefore extended in the present study to measure the change in topography when FFM is employed in the wear regime, providing an in situ wear rate measurement.…”

Section: Introductionmentioning

confidence: 98%

Structure‐Dependent Wear and Shear Mechanics of Nanostructured MoS₂ Coatings

Serles

Sun

Colas

et al. 2020

Adv Materials Inter

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Sputter deposited molybdenum disulfide coatings are one of the most common lubricants for extreme environments. However, their performance predictability remains limited by the complexity of van der Waals wear and shear mechanics in bulk materials resulting in unexpected premature failure. In the present study, two nanostructured MoS2 coatings of similar macroscopic properties are shown to exhibit entirely different wear and shear mechanics due to their nanostructure. Friction force microscopy with steel-beaded cantilevers is used to measure the per-cycle evolution of friction, wear, and topography in situ over the lubricant lifetime under an inert nitrogen environment. Molecular dynamics simulations confirm the subsurface structural failure mechanisms of the coatings under shear stress and AFM phase imaging and Raman spectroscopy are used to identify tribofilm formation mechanics. The nanocrystalamorphous composite structure shows improved wear resistance but at the cost of limited stress relaxation which creates high-stress failure and fracture-dominated wear. The purely nanocrystalline coating exhibits lower shear resistance but consistent stress relaxation by van der Waals cleavage and triple junction fracture which results in higher wear rates with predictable abrasion-dominated failure. The contrast in nanoscale performance of the coatings allows for the lubricant nanostructure to be tuned for ideal applications for extreme environments.

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An In Situ Method for Simultaneous Friction Measurements and Imaging of Interfacial Tribochemical Film Growth in Lubricated Contacts

Cited by 40 publications

References 40 publications

Effect of grain orientation on friction and wear behavior of AZ91 magnesium alloy

Effect of grain orientation on friction and wear behavior of AZ91 magnesium alloy

Insights into tribology from in situ nanoscale experiments

Structure‐Dependent Wear and Shear Mechanics of Nanostructured MoS₂ Coatings

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An In Situ Method for Simultaneous Friction Measurements and Imaging of Interfacial Tribochemical Film Growth in Lubricated Contacts

Cited by 40 publications

References 40 publications

Effect of grain orientation on friction and wear behavior of AZ91 magnesium alloy

Effect of grain orientation on friction and wear behavior of AZ91 magnesium alloy

Insights into tribology from in situ nanoscale experiments

Structure‐Dependent Wear and Shear Mechanics of Nanostructured MoS2 Coatings

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Product

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Structure‐Dependent Wear and Shear Mechanics of Nanostructured MoS₂ Coatings