In situ tribometry of cold-sprayed Al-Al2O3 composite coatings

Shockley, J. Michael; Strauss, Holger W.; Chromik, Richard R.; Brodusch, Nicolas; Gauvin, Raynald; Irissou, Éric; Legoux, Jean-Gabriel

doi:10.1016/j.surfcoat.2012.04.099

Cited by 69 publications

(32 citation statements)

References 42 publications

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“…In addition, the cross-sectional SEM images revealed a grain refinement in the near-surface region, which is thicker for the sliding tests performed at a lower contact pressure (i.e., 15 MPa) compared to the higher one (i.e., 35 MPa). The grain refinement in aluminum alloys induced by sliding has been previously reported [1,4] and can be explained by nucleation of dislocations at the surface as well as rotation of clusters [27,28]. In general, one would expect a significant deviation in the mechanical response of the worn surfaces compared to the unworn ones [29].…”

Section: Discussionmentioning

confidence: 75%

“…To elucidate on these variations of the tribological response, we investigated the third bodies in terms of their elemental composition, structure, and mechanical behavior. The worn surfaces for both the low and high contact pressures showed an increase in the oxide content compared to the unworn surface, which is quite common in metallic sliding contacts [20][21][22][23][24], in particular for aluminum alloys [1,4,13,25,26]. In addition, the cross-sectional SEM images revealed a grain refinement in the near-surface region, which is thicker for the sliding tests performed at a lower contact pressure (i.e., 15 MPa) compared to the higher one (i.e., 35 MPa).…”

Section: Discussionmentioning

confidence: 98%

“…Several research efforts have been performed to understand how these third bodies influence the steadystate friction and wear response of aluminum alloys [1,[4][5][6][7][8][9][10][11][12][13]. For instance, Rice et al [14] identified three different zones as a result of sliding and impact wear: base material, the deformed intermediate region, also described as ''tribologically transformed structures (TTS)'' [15], and the tribolayer consisting of high oxide content as well as transfer material.…”

Section: Introductionmentioning

confidence: 99%

“…Such a shear layer was also present beneath the MML layer of the Al-SiC specimen. More recently, Shockley et al [4] studied the dynamic events at the sliding interface of coldsprayed Al-Al 2 O 3 composite coatings by means of an in situ tribometer. Using a transparent counterface, the authors were able to identify correlations between the formation of transfer films and fluctuations in the tribological response of the system.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…Incorporation of alumina not only significantly improves wear resistance, but also dramatically increases both the density of the coating, and the bond strength between the coating and the substrate, through the "hammering" effect [11][12][13][14][15] upon impact of the particles onto the substrate. In addition, Spencer, Luzin and Zhang [16,17] have also measured the residual stress of various cold sprayed coatings on magnesium alloy substrates using neutron diffraction.…”

Section: Introductionmentioning

confidence: 99%

The effect of cold sprayed coatings on the mechanical properties of AZ91D magnesium alloys

Xiong

Zhang

2014

Surface and Coatings Technology

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Although many previous studies have confirmed that cold sprayed Al+xAl 2 O 3 (x=0-75vol.%) composite coatings on magnesium alloys can effectively improve wear and corrosion resistance, the effect of such coatings on tensile and fatigue properties is still unclear. The present work aims to evaluate the tensile properties and fatigue resistance of an AZ91D alloy with cold sprayed Al+xAl 2 O 3 (x=0, 30, 50vol.%) coatings. The experimental results showed that although the cold spray coating leads to an increase in yield strength and fatigue limit, the tensile strength is reduced. In-situ examination of the macro-morphology of surfaces of the coated specimens during tensile testing was carried out through video recording. It indicated that once the tensile specimens have yielded, horizontal cracks that were perpendicular to the tensile axis formed on the surface of the specimens. Fractographic analysis of the fracture surfaces of the tensile specimens in a scanning electron microscope revealed that all the cracks within the cold sprayed coatings were suspended at the coating/substrate interface. Based on these experimental observations, it is considered that the improved yield strength is attributed to the constraint effect of the cold sprayed composite coatings on the magnesium substrate. The enhanced fatigue limit is a result of the higher yield strength and the coating/substrate interface barrier to crack propagation. The decrease in tensile strength is attributed to the brittle fracture of the cold sprayed coatings when yielding of the specimens.

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Structure and Mechanical Behavior of Al–Nb Hybrids Obtained by High‐Pressure‐Torsion‐Induced Diffusion Bonding and Subsequent Annealing

Korznikova

Nazarov

et al. 2020

Adv Eng Mater

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The main approach of mechanical consolidation of dissimilar metals consists in solid state joining of thin discs or powders by means of pressure‐assisted shear deformation. Prior to this research, most strongly dissimilar systems, such as Al–W and Al–Ti, were only bonded by means of mechanical alloying and subsequent powder compaction. Herein, pioneering experimental research on the one‐step synthesis of an Al–Nb composite by means of diffusion bonding through high‐pressure torsion that allows figuring out several unusual results is presented. The maximal microhardness value is revealed to locate in the middle radius area, decreasing at the sample edge. Formation of a small amount of Al3Nb intermetallic phase is detected at room temperature deformation, while its equilibrium formation normally occurs above 600 °C. Post‐deformational annealing at 400 °C results in the overall decrease of the microhardness value along with its growth on the sample edge. Annealing at 600 °C does not lead to any degradation of the mechanical characteristics by comparison to those after annealing at 400 °C. The obtained results are discussed and explained in frames of contribution of different factors to the strengthening and softening dynamics of the composite material.

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In situ tribometry of cold-sprayed Al-Al2O3 composite coatings

Cited by 69 publications

References 42 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

The effect of cold sprayed coatings on the mechanical properties of AZ91D magnesium alloys

Structure and Mechanical Behavior of Al–Nb Hybrids Obtained by High‐Pressure‐Torsion‐Induced Diffusion Bonding and Subsequent Annealing

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