Third Body Behavior During Dry Sliding of Cold-Sprayed Al-Al2O3 Composites: In Situ Tribometry and Microanalysis

Shockley, J. Michael; Descartes, Sylvie; Irissou, Éric; Legoux, J.-G.; Chromik, Richard R.

doi:10.1007/s11249-014-0326-z

Cited by 32 publications

(27 citation statements)

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“…The 35 MPa micropillars, on the other hand, exhibit higher mechanical stability in terms of reduced catastrophic failure and more pronounced strain hardening, which might be a result of dislocation strengthening (i.e., higher dislocation density with a more homogeneous distribution compared to the 15 MPa sliding test). Congruently, the formation of a thin and stable MML, as observed for the 35 MPa contact pressure experiment, is responsible for the short running-in period resulting in low friction and high wear resistance, as also reported in the literature [11,31].…”

Section: Discussionsupporting

confidence: 75%

Dependence of tribofilm characteristics on the running-in behavior of aluminum–silicon alloys

et al. 2015

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In this study, we evaluate the evolution of the interfacial processes in metallic sliding contacts (i.e., aluminum alloys) in terms of their elemental composition, structural changes, and nanomechanical properties in order to understand the optimal running-in behavior leading to steady-state low friction and high wear resistance. Two different sliding conditions are used, resulting in low and high long-term friction and corresponding well with the low and high wear rates. Ex situ elemental analysis of these sliding experiments was performed by means of X-ray photoelectron spectroscopy. The mechanical properties were evaluated using nanoindentation and microcompression testing. While the elemental analysis revealed an increased oxide content for the near-surface region of the worn surfaces compared to the unworn material, the oxide content was higher for the experiments that resulted in an unfavorable tribological response (i.e., high friction and high wear). Similarly, the sub-surface grain-refined layer under these conditions was thicker compared to the experiment with a short running-in stage and low steady-state friction and wear. These observations correlated well with the nanoindentation and microcompression results, which show higher hardness and yield stress for the high friction and wear experiment. Correspondingly, low steady-state friction and wear were obtained with the formation of a thin and mechanically stable tribolayer.

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Section: Discussionsupporting

confidence: 75%

Dependence of tribofilm characteristics on the running-in behavior of aluminum–silicon alloys

et al. 2015

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“…In Regime I, the transfer film is formed by adhesive transfer of Cd to the countersphere. However, for metallic wear, these early stages of wear are dynamic and periodical, transfer film material is lost or replenished [3,4,9,13]. These lead to discrete events of increased friction lasting a few cycles with no significant spatial features.…”

Section: Average Friction Data At Rh60mentioning

confidence: 99%

“…Furthermore, application of some soft metallic coating can act as solid lubricant [1], which lowers the CoF [3,6,7]. These third bodies formed with metallic coatings [8][9][10][11] are dependent on the chemo-mechanical properties of the coating and the substrate. Sacrificial Cd coating applied on aerospace materials is soft and acts as a lubricant [12], forming third bodies [3] at the contact region making it beneficial for its specific use.…”

Section: Introductionmentioning

confidence: 99%

“…Sacrificial Cd coating applied on aerospace materials is soft and acts as a lubricant [12], forming third bodies [3] at the contact region making it beneficial for its specific use. Though there have been recent work on metallic sliding [8][9][10][11][13][14][15][16], the dynamic nature of the third bodies formed at the interface is difficult to understand and correlate with the change in CoF occurring within one cycle of the test. Available literature for in situ tribometry method [17] used to study the evolution of third body morphology is mostly limited to transfer film and not frequently used to correlate the change in CoF when transfer film is not present.…”

Section: Introductionmentioning

confidence: 99%

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Friction transitions and connections to third bodies for a Cd coating on steel substrate

et al. 2020

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Cd coating is used in aerospace industries from last five decades due to its sacrificial protection and lubrication properties. Although Cd coating is primarily used due to its sacrificial corrosion protection when applied on steel substrate, the added benefit of modifying the tribological behavior by acting as a lubricious layer gives it a leading-edge than other coatings. Often the measurement of friction coefficient (CoF) is reported as a value generated after full sliding cycle. This measurement of average CoF generally limits the study of local variation in CoF occurring within one sliding cycle, which can be significantly different with change in spatial position due to change in third body morphology. In this study, a linearly reciprocating sliding test is used to measure the CoF at a sampling rate of 800 Hz along the track length to generate triboscopic image with steel countersphere. The instantaneous CoF obtained with triboscopy is correlated with the wear track morphology using scanning electron microscope (SEM) and optical profilometer for variation in contact conditions. Tribological test performed in dry atmosphere shows an average CoF of 0.4 till the end of the test whereas with increase in relative humidity to 60%, the average CoF changes from 0.4 to 0.8 at the end of the test due to change in contact conditions. Soft Cd coating on low carbon steel substrate is used to study these variations in third body morphology.

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“…Eventually, for sliding contact between two materials, the region of interest is in the contact and near the contact area, which remains hidden from view or inspection using traditional surface characterization methods. Recently, several tribometers were used to directly observe the third body behavior through the transparent first body (glass and sapphire) and to correlate it to friction events and wear [31][32][33][34][35]. Several benefits can be obtained by performing tribological measurements in real-time.…”

Section: Introductionmentioning

confidence: 99%

Tribolumen: A Tribometer for A Correlation Between AE Signals and Observation of Tribological Process in Real-Time—Application to A Dry Steel/Glass Reciprocating Sliding Contact

et al. 2020

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This paper deals with the development of an original apparatus called TRIBOLUMEN designed specifically for friction experiments on transparent materials. The friction measurement is synchronized with an acoustic emission (AE) sensor and the device is also equipped with a high-speed camera offering a direct view at the interface to gain a deeper understanding of tribological mechanisms. The TRIBOLUMEN device is in ball-on-flat contact configuration with a range of strokes from 5 to 500 µm and an oscillation frequency from 5 to 600 Hz. The experiments showed that this device has an adequate rigidity and can detect subtle friction modifications of the oscillating contacts. The observation of a steel-on-glass contact in real-time highlighted the initiation of Hertzian cracks followed by the formation of debris in the contact. Using the synchronous measurement, these mechanisms were clearly associated with different stages in the friction measurement and in the AE signals, which permitted to identify the AE signature of Hertzian cracks.

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Third Body Behavior During Dry Sliding of Cold-Sprayed Al-Al2O3 Composites: In Situ Tribometry and Microanalysis

Abstract: Third body behavior during dry sliding of cold-sprayed Al-Al₂O₃ composites : in situ tribometry and microanalysis Shockley, J. Michael; Descartes, S.; Irissou, É.; Legoux, J.-G.; Chromik, R. R.

Cited by 32 publications

References 50 publications

Dependence of tribofilm characteristics on the running-in behavior of aluminum–silicon alloys

Dependence of tribofilm characteristics on the running-in behavior of aluminum–silicon alloys

Friction transitions and connections to third bodies for a Cd coating on steel substrate

Tribolumen: A Tribometer for A Correlation Between AE Signals and Observation of Tribological Process in Real-Time—Application to A Dry Steel/Glass Reciprocating Sliding Contact

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