Importance of surface oxide for the tribology of a Zr-based metallic glass

Kang, Sung-Jin; Rittgen, Kai T.; Kwan, S.; Park, H. W.; Bennewitz, Roland; Caron, Arnaud

doi:10.1007/s40544-017-0149-7

Cited by 30 publications

(9 citation statements)

References 26 publications

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“…Interestingly, there is no trace of Fe detected inside the friction track on the CuZr plate, C and O are however highly detected. Previous studies 10,38 on the exact same material showed that the oxide layer on top of the metallic glass is mostly comprised of ZrO 2 , then Cu 2 O, and a very small portion of Al 2 O 3 , that is consistent with the EDS analysis of the friction track at low load. At high load, however, Cu and C are highly detected as compared to Zr.…”

Section: Friction Tracks Morphology and Chemistrysupporting

confidence: 81%

“…Based on the morphology of the friction tracks, the accommodation of relative velocities is believed to be done by mixing different modes: mainly interface shearing (sliding of the ball over the patches), rolling (isolated particles), and shearing in the volume of the patches. Kang et al 10 showed that shear and ploughing were the main mechanisms contributing to friction in their case, but the shear contribution increased upon contamination time, i.e. if oxidation increased.…”

Section: Friction Tracks Morphology and Chemistrymentioning

confidence: 97%

“…(3) The tribological mechanisms observed also vary a lot according to the friction conditions (speed, pressure, geometry, kinematics...) 2,3,6 . Complex but rather common phenomena of material transfer 2,4,9,10 , establishment of a 3 rd body at the interface [8][9][10][11] , modification of the mechanical properties of the BMG by frictional heating 9,[11][12][13] or oxidation 7,10,[13][14][15][16][17] have been mainly observed. Less common is the appearance of specific subsurface phenomena such as shear bands underneath the surface and acting as "internal interfaces" 17 , the dependency of crack propagations on the environment 8 .…”

Section: Introductionmentioning

confidence: 99%

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On the diversity of accommodation mechanisms in the tribology of Bulk Metallic Glasses

Cornuault

Colas

Lenain³

et al. 2020

Tribology International

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Bulk Metallic Glasses (BMG) have exceptional mechanical properties compared to their traditional crystalline counterparts. However, BMGs often exhibit scattered tribological behaviours. To better understand the underlying mechanisms governing the behaviour of BMGs, four different alloys (Zr 52.5 Ti 5 Cu 17.9 Ni 14.6 Al 10 , Cu 47 Zr 46 Al 7 , Cu 60 Zr 33 Ti 7 , and Ni 62 Nb 33 Zr 5) were studied in pure sliding, reciprocating conditions. The study shows that the residual elements coming either from the counterpart or the surrounding environment plays a major role in their tribological behaviour. The composition of the BMG have a lower impact in the process. Eventually, the study concludes that optimization of the tribological behaviour of the BMGs might not necessarily rely on optimizing BMG composition but might rather rely on optimizing the choice of counterparts as a function of contact conditions.

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Section: Friction Tracks Morphology and Chemistrysupporting

confidence: 81%

Section: Friction Tracks Morphology and Chemistrymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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On the diversity of accommodation mechanisms in the tribology of Bulk Metallic Glasses

Cornuault

Colas

Lenain³

et al. 2020

Tribology International

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“…On one hand, oxidation has to be avoided in many applications to prevent degradation of components [10]. On the other hand, it has been found that the oxide layer can be helpful for enhanced properties, in particular, for the strengthening of micro devices, because it can prevent the micro devices from failure upon friction [12][13][14]. Therefore, understanding the oxidation behavior of BMGs is critical and will be helpful for the control of oxidation process.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of a Zr46Cu46Al7Gd1 bulk metallic glass detected via optical characterizations

Xie

Cao

et al. 2020

Sci. China Mater.

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Oxidation of metallic glasses has been shown to be different from crystalline alloys due to the disordered atomic structures and far-from-equilibrium state, and quick characterization is required to reveal their early stage oxidation. In this study, we investigated the oxidation behavior of a Zr 46 Cu 46 Al 7 Gd 1 bulk metallic glass by measuring the changes of optical constants via spectroscopic ellipsometry. Characterizations with X-ray diffraction, scanning electron microscopy, and thermogravimetric analyzer confirmed that the changes of pseudo-optical constants reflected not only the onset temperature at which the alloys underwent obvious oxidation, but also the subtle oxidation which was tedious to characterize. Our study suggests a more efficient and accurate approach to understand the oxidation of metallic glasses with temperature, time and compositions.

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“…From a different perspective, thermally induced oxidation is a major chemical approach to synthesize oxide thin films for applications such as sensors, catalysts, insulators and bioimplants 29 . Oxidation of metallic glasses have also been reported to yield a ten times improvement in the wear resistance of these materials 30–32 . This could be utilized by metallic glass alloys and coatings fabricated by a number of processing techniques such as laser cladding and spark plasma sintering 33–35 .…”

Section: Introductionmentioning

confidence: 99%

Quantification of Thermal Oxidation in Metallic Glass Powder using Ultra-small Angle X-ray Scattering

Paul

Zhang

Biswas

et al. 2019

Sci Rep

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In this paper, the composition, structure, morphology and kinetics of evolution during isothermal oxidation of Fe 48 Cr 15 Mo 14 Y 2 C 15 B 6 metallic glass powder in the supercooled region are investigated by an integrated ex - situ and in - situ characterization and modelling approach. Raman and X-ray diffraction spectra established that oxidation yielded a hierarchical structure across decreasing length scales. At larger scale, Fe 2 O 3 grows as a uniform shell over the powder core. This shell, at smaller scale, consists of multiple grains. Ultra-small angle X-ray scattering intensity acquired during isothermal oxidation of the powder over a wide Q-range delineated direct quantification of oxidation behavior. The hierarchical structure was employed to construct a scattering model that was fitted to the measured intensity distributions to estimate the thickness of the oxide shell. The relative gain in mass during oxidation, computed theoretically from this model, relatively underestimated that measured in practice by a thermogravimetric analyzer due to the distribution in sizes of the particles. Overall, this paper presents the first direct quantification of oxidation in metallic glass powder by ultra-small angle X-ray scattering. It establishes novel experimental environments that can potentially unfold new paradigms of research into a wide spectrum of interfacial reactions in powder materials at elevated temperatures.

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Importance of surface oxide for the tribology of a Zr-based metallic glass

Cited by 30 publications

References 26 publications

On the diversity of accommodation mechanisms in the tribology of Bulk Metallic Glasses

On the diversity of accommodation mechanisms in the tribology of Bulk Metallic Glasses

Oxidation of a Zr46Cu46Al7Gd1 bulk metallic glass detected via optical characterizations

Quantification of Thermal Oxidation in Metallic Glass Powder using Ultra-small Angle X-ray Scattering

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