Sliding behavior of metallic glass

Fu, Xi-Yong; Falk, Michael L.; Rigney, D.A.

doi:10.1016/s0043-1648(01)00607-x

Cited by 87 publications

(66 citation statements)

References 28 publications

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“…Fu et al 2001a), leading to heterogeneous surface alteration and continued abrasion of non-planar obstacles. Accompanying molecular dynamics simulations (Fu et al 2001b) demonstrate the importance of mixing phenomena at all stages of sliding. While Chester & Chester (1998) did not observe mixed material in the fault core during late stages of faulting, competing processes of debris formation and removal by wear are likely to play a significant role in early and intermediate stages of fault zone evolution.…”

Section: Competing Weakening and Healing Mechanisms Competing Weakenimentioning

confidence: 96%

Seismicity in a model governed by competing frictional weakening and healing mechanisms

Hillers

Carlson

Archuleta

2009

Geophysical Journal International

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S U M M A R YObservations from laboratory, field and numerical work spanning a wide range of space and time scales suggest a strain dependent progressive evolution of material properties that control the stability of earthquake faults. The associated weakening mechanisms are counterbalanced by a variety of restrengthening mechanisms. The efficiency of the healing processes depends on local material properties and on rheologic, temperature, and hydraulic conditions. We investigate the relative effects of these competing non-linear feedbacks on seismogenesis in the context of evolving frictional properties, using a mechanical earthquake model that is governed by slip weakening friction. Weakening and strengthening mechanisms are parametrized by the evolution of the frictional control variable-the slip weakening rate R-using empirical relationships obtained from laboratory experiments. In our model, weakening depends on the slip of an earthquake and tends to increase R, following the behaviour of real and simulated frictional interfaces. Healing causes R to decrease and depends on the time passed since the last slip. Results from models with these competing feedbacks are compared with simulations using non-evolving friction. Compared to fixed R conditions, evolving properties result in a significantly increased variability in the system dynamics. We find that for a given set of weakening parameters the resulting seismicity patterns are sensitive to details of the restrengthening process, such as the healing rate b and a lower cutoff time, t c , up to which no significant change in the friction parameter is observed. For relatively large and small cutoff times, the statistics are typical of fixed large and small R values, respectively. However, a wide range of intermediate values leads to significant fluctuations in the internal energy levels. The frequency-size statistics of earthquake occurrence show corresponding non-stationary characteristics on time scales over which negligible fluctuations are observed in the fixed-R case. The progressive evolution implies that-except for extreme weakening and healing rates-faults and fault networks possibly are not well characterized by steady states on typical catalogue time scales, thus highlighting the essential role of memory and history dependence in seismogenesis. The results suggest that an extrapolation to future seismicity occurrence based on temporally limited data may be misleading due to variability in seismicity patterns associated with competing mechanisms that affect fault stability.

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Section: Competing Weakening and Healing Mechanisms Competing Weakenimentioning

confidence: 96%

Seismicity in a model governed by competing frictional weakening and healing mechanisms

Hillers

Carlson

Archuleta

2009

Geophysical Journal International

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“…In this regard, it is worth noting that the average duration of collisions, of about 1 ms or less, 111 is considerably longer than the time interval underlying the local transformations induced by strain, which roughly occur in 1 to 10 ns. [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] It follows that a given collision can activate various local deformation processes. Also, any given local process activated by a given collision can reach completion before the successive collision takes place.…”

Section: Kineticsmentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

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The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

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“…No unique correlation between the hardness and the tribological behaviour of metallic glasses has been established so far. At the macro-scale the tribological mechanisms are complex and involve a combination of plasticity, structural relaxation and transformation [8], and material transfer [9], or mixing [10,11] with subsequent chemical reactions and structural changes.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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Thermally grown surface oxide layers dominate the single-asperity tribological behavior of a Zr 60 Cu 30 Al 10 glass. Increase in oxidation time leads to an increased contribution of shearing and a corresponding decreased contribution of ploughing to friction. This change in the dominating friction and wear mechanism results in an overall minor decrease of the friction coefficient of oxidized surfaces compared to the metallic glass sample with native surface oxide. Our results demonstrate the importance of creating a stable oxide layer for practical applications of metallic glasses in micro-devices involving sliding contact.

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Sliding behavior of metallic glass

Cited by 87 publications

References 28 publications

Seismicity in a model governed by competing frictional weakening and healing mechanisms

Seismicity in a model governed by competing frictional weakening and healing mechanisms

Hallmarks of mechanochemistry: from nanoparticles to technology

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

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