Structure and mechanical properties of tribologically induced nanolayers

Shakhvorostov, D.; Pöhlmann, K.; Scherge, Matthias

doi:10.1016/j.wear.2005.02.086

Cited by 42 publications

(34 citation statements)

References 15 publications

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“…In general, they posses significantly reduced grain size, texture with respect to the sliding direction, and residual stresses influencing the choice of favorable slip systems during plastic deformation. For layers with an average grain size below 10-100 nm, the deformation behavior might change significantly, and such layers can act quasi superplastically, exhibiting low shear strength at high strain rates [14][15][16]. Single crystals show a preferred sliding direction based on the orientation of their crystallographic planes, as long as no friction-induced textures have yet appeared.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cu Grain Size on Running-in Related Phenomena

Shakhvorostov

Nold³

et al. 2007

Tribol Lett

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We used a single-asperity microscopic tribosystem diamond sphere/Cu sheet to investigate the relevant phenomena affecting the dynamics of friction and wear in a macroscopic system. The influence of the average grain size of the softer of two tribopartners on friction and wear was investigated in particular. The observed tribosystem experienced a natural transition during the running time, from severe plastic flow to predominating boundary lubrication. This fact was used to study the influence of poly-a-olefine base oil and fully formulated engine oil Fuchs Titan SAE 5W45 on friction and wear during severe deformation and the boundary lubrication regime. It is shown that the initial grain size has a crucial influence on wear and friction only during first sliding interactions. During the initial sliding, the grain size rapidly decreases due to plastic deformation. The grains then become uniformly equal in size in every initial situation after approximately 30 cycles. Initially larger grains result in increased friction and wear as well as higher sensitivity to the kind of lubrication.

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Section: Introductionmentioning

confidence: 99%

Influence of Cu Grain Size on Running-in Related Phenomena

Shakhvorostov

Nold³

et al. 2007

Tribol Lett

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“…9b. These curves are reproduced from measurements presented in [6]. The three curves represented: curve A originates from a new sampled after polishing, curve B from a mild wear test, and curve C from a failed (high wearing) system.…”

Section: Materials Modelmentioning

confidence: 99%

“…The research is currently focusing more toward the micro-/nanolevel, as it is becoming clearer that the friction and wear in systems are determined in the first few nano-/micrometers underneath the surface. Looking at systems operating in boundary lubrication conditions extensive grain refinement down to tenths of nanometer is seen near the surface and different plastic material properties can be expected through the Hall-Petch relationship and the inverse Hall-Petch relationship [6,7], e.g. material hardening or softening, respectively.…”

Section: Introductionmentioning

confidence: 99%

Running-In of Systems Protected by Additive-Rich Oils

Bosman

Schipper

2010

Tribol Lett

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Recent research on mild wearing systems running under boundary lubrication conditions focus more and more on the role of the nano-crystalline layer present at the surface of the components in contact. This layer has a typical thickness of a few tenths of nano-meters up to a few microns depending on the operational conditions. The role of this layer with respect to wear is, however, still unclear as well as its mechanical behavior. In this study, a first step is made in incorporating this type of layer into a wear model. Using an elasto-plastic semi-analytical-method the effect of different material behaviors reported through out current literature for the nano-crystalline layer on wear is studied. From the results it can be concluded that the effect of this mechanically altered layer has an important influence on the wear of the system, especially during the initial phase of running.

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“…Material mixing and diffusion involve modification of morphology, crystalline structure and chemical composition of surface and near surface regions [1][2][3][4]. Wear rate and friction coefficient are very sensitive to the appearance of the interface and subsurface of contacting bodies, which are intensively studied nowadays [5][6][7][8]. Improvement of analytical tools and their good availability for characterization of the chemistry and microstructure of the interface and subsurface resulted in the amount of publication in the area of layers characterization.…”

Section: Introductionmentioning

confidence: 99%

“…We use a pin-on-disk tribometer to investigate the influence of the loading conditions on the wear mechanism and appearance of the subsurface layers studied with help of transmission electron microscopy. Our previous studies dealt with chemical composition and mechanical response of the surface [1,7]. Here we focus on the structural rearrangements of the material due to friction and discuss anti-wear properties of nano-crystalline layers.…”

Section: Introductionmentioning

confidence: 99%