FIB and TEM characterization of subsurfaces of an Al–Si alloy (A390) subjected to sliding wear

Li, Jian; Elmadagli, M.; Gertsman, V.Y.; Lo, Jason; Alpas, A.T.

doi:10.1016/j.msea.2006.01.084

Cited by 95 publications

(35 citation statements)

References 16 publications

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“…Some authors report that tribocorrosion of Al alloys in NaCl based solutions is characterized by adhesive wear, abrasive wear and plastic deformation [15][16][17]. In the case of passive aluminum, one would expect a significant increase in corrosion rate due to the mechanical removal of the passive film and the exposure of bare metal to the solution.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Papageorgiou

Mischler

2012

Tribol Lett

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Valuable insights into the wear-corrosion behavior of metals, as well as into the tribocorrosion field through the development of simulation models of tribocorrosion experiments, can contribute in rationalizing wearaccelerated experiments and their open circuit potential (OCP) behavior under rubbing. These results demonstrate that mathematical models of controlled tribo-electrochemical contacts can complement the physical experiment and add valuable understanding to the tribological behavior of metals, alloys, and generally to materials in an electrochemically active environment. The excellent agreement of experimental wear data and the experimental OCP curves with the OCP simulations with time establishes the concepts underlying the galvanic coupling model as a valid methodological approach toward a quantitative description and mechanistic understanding of the tribo-electrochemical experiment. Besides analyzing stellite tribocorrosion, application of the model to Al alloy data has helped us quantify the relative contributions of chemical and mechanical wear and reveal the underlying synergy. Ti metal tribocorrosion under variable load has revealed that the contact pressure P av , can reach much lower values within the experimental time domain and finally be the cause of interruption of the initial wear mechanism.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Papageorgiou

Mischler

2012

Tribol Lett

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“…Oxides formed in the eutectic Fe 30 Ni 20 Mn 35 Al 15 alloy seem to correspond to the latter case. In general, the layers underneath the worn surface of specimens, commonly associated with deformation, compaction, and fragmentation, subjected to sliding wear are called mechanically mixed layers [22], or tribolayers [23]. In the present work, FIB cross sections were prepared through the wear surfaces and the tribolayers are evident in the resulting SE images of the FIBbed pits shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

The effects of environment on the dry sliding wear of eutectic Fe30Ni20Mn35Al15

2012

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The wear of as-cast eutectic Fe 30 Ni 20 Mn 35 Al 15, which consists of lamellar f.c.c. and B2 phases, was studied using pin-on-disk tribotests in four different environments: air, dry oxygen, dry argon, and a 4% hydrogen/nitrogen mixture. The counterface in all the tests was yttria-stabilized zirconia. Wear debris and wear tracks were examined in detail to investigate the surface effects during dry sliding and these were correlated with the wear properties. It was found that the wear rate was about 40% lower in tests performed under argon, compared to tests conducted in either air or oxygen. However, the wear rate was about 1000% higher when the tests were conducted in a hydrogen-containing environment. The near-surface regions of the pins were examined using transmission electron microscopy of cross-sectional specimens produced by focused ion beam milling. For tests in oxygen-containing environments, abrasive particles were produced by oxidation. These, protruded and peeled off from the matrix and mixed with the debris from the counterface, producing a combination of a two-body and three-body abrasive wearcontrolled processes. In contrast, for tests under argon, plastic flow mechanisms dominated. The dramatic increase of wear in 4% hydrogen/nitrogen was due to hydrogen embrittlement, which meant that little plastic flow occurred, a feature consistent with the results of prior tensile tests.

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“…To solve this problem, Focused Ion Beam (FIB and TEM) techniques [10][11][12][13] have been recently proposed for the high resolution three-dimensional characterization of worn surfaces.…”

Section: Introductionmentioning

confidence: 99%

Wear mechanisms and in-service surface modifications of a stellite 6B Co-Cr alloy

Bemporad¹,

Sebastiani²,

Mangione³

et al. 2014

SCAD

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Abstract:In the present paper, the in-service wear mechanisms and cross-sectional microstructural evolution of a Stellite 6B cobalt-based alloy subjected to sliding contact conditions are analysed. The analysis is carried out using focused ion beam (FIB), transmission electron microscopy (TEM), 3D confocal profilometer and nanoindentation techniques. Samples under investigation consisted of a lipseal adopted in a Tunnel Boring Machine (TBM). In the working conditions, the lip-seal is in sliding contact with a rubber seal in a pressurised oil environment. In those conditions, an unexpected low wear resistance was observed during service. As a consequence, a long machine downtime was necessary to replace the damaged component. Results of FIB-SEM/EDS characterisation showed severe grooving due to the presence of sand (SiO 2 ) particles embedded in the rubber seal in the contact area. In addition, three body abrasive wear is observed immediately outside the contact area. Microstructural evaluation of Stellite 6 B Co-based alloy of the cross-section also showed the presence of a nano-crystalline hardened layer with diffuse presence of stacking faults. The presence of a tribo-film with a complex structure was also clearly observed. It is concluded that wear resistance of such components could be significantly enhanced either by a proper control of abrasive contaminant particles in the lubricant oil or by introducing a proper protective coating (e.g. a thermal sprayed thick coating).

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FIB and TEM characterization of subsurfaces of an Al–Si alloy (A390) subjected to sliding wear

Cited by 95 publications

References 16 publications

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

Electrochemical Simulation of the Current and Potential Response in Sliding Tribocorrosion

The effects of environment on the dry sliding wear of eutectic Fe30Ni20Mn35Al15

Wear mechanisms and in-service surface modifications of a stellite 6B Co-Cr alloy

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