Tribologically induced crystal rotation kinematics revealed by electron backscatter diffraction

Haug, Christian; Molodov, Dmitri A.; Gumbsch, Peter; Greiner, Christian

doi:10.1016/j.actamat.2021.117566

Cited by 14 publications

(3 citation statements)

References 64 publications

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“…This means that up to a certain stress level, TD is favoured as rotation axis. The crystal rotation around TD was also observed in other studies [4,10,44,46].…”

Section: Dislocation Trace Line and Crystal Rotationsupporting

confidence: 83%

Dislocation-mediated and twinning-induced plasticity of CoCrFeMnNi in varying tribological loading scenarios

et al. 2022

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Coarse-grained, metallic materials undergo microstructure refinement during tribological loading. This in turn results in changing tribological properties, so the microstructural evolution is a parameter which should not be underestimated while designing tribological systems. Single-trace experiments were conducted to understand the initiation of deformation mechanisms acting in various tribological systems. The main scope of this work was to investigate the influence of normal and friction forces as well as crystal orientations on the dominating deformation mechanism in a face-centred cubic concentrated solid solution. While varying the normal force is easily realised, varying friction forces were achieved by using several counter body materials paired against CoCrFeMnNi. The subsurface deformation layer was either mediated through dislocation slip or twinning, depending on the grain orientation and on the tribological system. A layer dominated by dislocation-based deformation is characterised by lattice rotation, the formation of a dislocation trace line or subgrain formation. Such behaviour is observed for tribological systems with a low friction coefficient. For systems dominated by deformation twinning, three types of twin appearance were observed: small twins interacting with the surface, large twins and grains with two active twin systems. Two different twinning mechanisms are discussed as responsible for these characteristics. Graphical abstract

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“…This means that up to a certain stress level, TD is favoured as rotation axis. The crystal rotation around TD was also observed in other studies [4,10,44,46].…”

Section: Dislocation Trace Line and Crystal Rotationsupporting

confidence: 83%

Dislocation-mediated and twinning-induced plasticity of CoCrFeMnNi in varying tribological loading scenarios

et al. 2022

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“…From the severe plastic deformation (SPD) literature that we know of, such strain rates require distinctly different deformation mechanisms than under hardness or tensile tests [72]. Finally, the differences in the stacking fault energies [73] or the tendency of the materials to form shear bands might have an influence [74], as well as other micro-and nanostructural effects that are still under investigation [25,75,76]. Including the contribution of the tribomaterial appears impossible, for we do not know its structural, mechanical, and fluidic properties under high shear rates at all.…”

Section: Frictional Workmentioning

confidence: 99%

Performance of Austenitic High-Nitrogen Steels under Gross Slip Fretting Corrosion in Bovine Serum

Fischer,

Telouk,

Beckmann

et al. 2024

JFB

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Modular artificial hip joints are a clinical standard today. However, the release of wear products from the head–taper interface, which includes wear particles in the nm size range, as well as metal ions, have raised concerns. Depending on the loading of such taper joints, a wide variety of different mechanisms have been found by retrieval analyses. From these, this paper concentrates on analyzing the contribution of gross slip fretting corrosion at ultra-mild wear rates using a bovine calf serum solution (BCS) as the lubricant. The parameters were chosen based on biomechanical considerations, producing wear rates of some ng/m wear path. In parallel, the evolution of tribomaterial (third bodies) was analyzed as to its constituents and generation rates. It has already been shown earlier that, by an advantageous combination of wear mechanisms and submechanisms, certain constituents of the tribomaterial remain inside the contact area and act like extreme-pressure lubricant additives. For the known wear and corrosion resistance of austenitic high-nitrogen steels (AHNSs), which outperform CoCrMo alloys even under inflammatory conditions, we hypothesized that such steels will generate ultra-mild wear rates under gross slip fretting. While testing AHNSs against commercially available biomedical-grade materials of CoCrMo and TiAlV alloys, as well as zirconia-toughened alumina (ZTA) and against itself, it was found that AHNSs in combination with a Ti6Al4V alloy generated the smallest wear rate under gross slip fretting corrosion. This paper then discusses the wear behavior on the basis of ex situ analyses of the worn surfaces as to the acting wear mechanisms and submechanisms, as well as to the tribological reaction products.

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“…Nanograins possess very limited strain hardening ability so that plastic incompatibility and strain localization occur during surface folding and cracking, which result in wear particles, invariably evoking a dramatic micro-cutting and three-body abrasion [ 1 , 11 ]. Experimental results in recent years give an illuminating picture about the wear resistance of the alloys that can be elevated when introducing heterogeneous structural evolutions to accommodate strain gradients along the friction interface, e.g., by introducing nanocomposite/amorphous tribo-layers [ 2 , 12 ], precipitation-reinforced interfaces [ 3 , 13 ], gradient nanograined subsurfaces [ 1 , 4 ], friction-induced nano-twins [ 14 , 15 ], crystallographic textures [ 16 ], and self-organized lubricating tribo-layers [ 10 , 17 ]. In particular, recent studies on the wear response of complex concentrated alloys (CCAs) have advanced the understanding of wear-driven friction interface protection.…”

Section: Introductionmentioning

confidence: 99%

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

et al. 2023

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Sustained wear damages on the sliding surfaces of alloys are generally the culprit responsible for the failure of various mechanical systems. Inspired by high-entropy effects, here we deliberately deploy nanohierarchical architecture with composition undulation in a Ni 50 (AlNbTiV) 50 complex concentrated alloy, which yields ultralow wear rate within the order of 10 −7 to 10 −6 mm 3 /Nm between room temperature and 800 °C. Such remarkable wear resistance heretofore represents one of the highest wear resistance reported for the bulk alloys or composites, and originates from the multi-type adaptive friction interface protection governed by intrinsically nano-coupled grains and nanoprecipitates. This cooperative heterostructure releases gradient frictional stress in stages upon wear at room temperature through the coexistence of multiple deformation pathways while activating a dense nanocrystalline glaze layer upon wear at 800 °C to minimize adhesive and oxidative wear. Our work uncovers a practical avenue for tailoring wear properties with multicomponent heterostructures over a wide temperature range.

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Tribologically induced crystal rotation kinematics revealed by electron backscatter diffraction

Cited by 14 publications

References 64 publications

Dislocation-mediated and twinning-induced plasticity of CoCrFeMnNi in varying tribological loading scenarios

Dislocation-mediated and twinning-induced plasticity of CoCrFeMnNi in varying tribological loading scenarios

Performance of Austenitic High-Nitrogen Steels under Gross Slip Fretting Corrosion in Bovine Serum

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

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