Structural Signature of Plasticity Unveiled by Nano-Scale Viscoelastic Contact in a Metallic Glass View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-07-07

AUTHORS

Y. M. Lu, J. F. Zeng, S. Wang, B. A. Sun, Q. Wang, J. Lu, S. Gravier, J. J. Bladin, W. H. Wang, M. X. Pan, C. T. Liu, Y. Yang

ABSTRACT

Room-temperature plasticity in metallic glasses (MGs) is commonly associated with local structural heterogeneity; however, direct observation of the subtle structural change caused by plasticity is vitally important but the data are extremely scarce. Based on dynamic atomic force microscopy (DAFM), here we show that plasticity-induced structural evolution in a Zr-Ni MG can be revealed via nano-scale viscoelastic contacts between an AFM tip and plastically deformed MG surface layers. Our experimental results clearly show a spatial amplification of the nano-scale structural heterogeneity caused by the distributed plastic flow, which can be linked to the limited growth, reorientation and agglomeration of some nano-scale energy-absorbing regions, which are reminiscent of the behavior of the defect-like regions with non-affine deformation as conceived in many theories and models. Furthermore, we are able to experimentally extract the thermodynamic properties of these nano-scale regions, which possess an energy barrier of 0.3-0.5 eV, about half of that for a typical shear transformation event that usually occurs at the onset of plasticity. The outcome of our current work sheds quantitative insights into the correlation between plasticity and structural heterogeneity in MGs. More... »

PAGES

29357

References to SciGraph publications

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    URI

    http://scigraph.springernature.com/pub.10.1038/srep29357

    DOI

    http://dx.doi.org/10.1038/srep29357

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1011611863

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/27383387


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    23 schema:description Room-temperature plasticity in metallic glasses (MGs) is commonly associated with local structural heterogeneity; however, direct observation of the subtle structural change caused by plasticity is vitally important but the data are extremely scarce. Based on dynamic atomic force microscopy (DAFM), here we show that plasticity-induced structural evolution in a Zr-Ni MG can be revealed via nano-scale viscoelastic contacts between an AFM tip and plastically deformed MG surface layers. Our experimental results clearly show a spatial amplification of the nano-scale structural heterogeneity caused by the distributed plastic flow, which can be linked to the limited growth, reorientation and agglomeration of some nano-scale energy-absorbing regions, which are reminiscent of the behavior of the defect-like regions with non-affine deformation as conceived in many theories and models. Furthermore, we are able to experimentally extract the thermodynamic properties of these nano-scale regions, which possess an energy barrier of 0.3-0.5 eV, about half of that for a typical shear transformation event that usually occurs at the onset of plasticity. The outcome of our current work sheds quantitative insights into the correlation between plasticity and structural heterogeneity in MGs.
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    31 Mg surface layer
    32 Zr-Ni metallic glasses
    33 agglomeration
    34 amplification
    35 atomic force microscopy
    36 barriers
    37 behavior
    38 changes
    39 contact
    40 correlation
    41 current work
    42 data
    43 defect-like regions
    44 deformation
    45 direct observation
    46 dynamic atomic force microscopy
    47 eV
    48 energy barrier
    49 energy-absorbing regions
    50 events
    51 evolution
    52 experimental results
    53 flow
    54 force microscopy
    55 glass
    56 growth
    57 half
    58 heterogeneity
    59 insights
    60 layer
    61 limited growth
    62 local structural heterogeneity
    63 metallic glasses
    64 microscopy
    65 model
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    67 nano-scale region
    68 nano-scale structural heterogeneity
    69 nano-scale viscoelastic contacts
    70 non-affine deformation
    71 observations
    72 onset
    73 onset of plasticity
    74 outcomes
    75 plastic flow
    76 plasticity
    77 plasticity-induced structural evolution
    78 properties
    79 quantitative insights
    80 region
    81 reorientation
    82 results
    83 room-temperature plasticity
    84 shear transformation event
    85 signatures
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    87 structural changes
    88 structural evolution
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