Evaluation of approximate measurements of activation-free-energy spectra of shear transformation zones in metallic glasses

Ju, JongDoo; Atzmon, Michael

doi:10.1016/j.jallcom.2014.10.156

Journal of Alloys and Compounds

2015

DOI: 10.1016/j.jallcom.2014.10.156

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Evaluation of approximate measurements of activation-free-energy spectra of shear transformation zones in metallic glasses

JongDoo Ju¹,

Michael Atzmon²

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Cited by 3 publications

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References 7 publications

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“…Amorphous solids, including metallic, polymeric, and colloidal glasses, possess complex mechanical response to applied deformations, such as plastic flow [1][2][3][4], strain localization [5][6][7][8][9], creep flow [7,10,11], and fracture [12][13][14]. In crystalline materials, topological defects reflecting the symmetry of the crystalline phase govern the response to applied deformations.…”

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Effects of cooling rate on particle rearrangement statistics: Rapidly cooled glasses are more ductile and less reversible

et al. 2017

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Amorphous solids, such as metallic, polymeric, and colloidal glasses, display complex spatiotemporal response to applied deformations. In contrast to crystalline solids, during loading, amorphous solids exhibit a smooth crossover from elastic response to plastic flow. In this study, we investigate the mechanical response of binary Lennard-Jones glasses to athermal, quasistatic pure shear as a function of the cooling rate used to prepare them. We find several key results concerning the connection between strain-induced particle rearrangements and mechanical response. We show that the energy loss per strain dU loss /dγ caused by particle rearrangements for more rapidly cooled glasses is larger than that for slowly cooled glasses. We also find that the cumulative energy loss U loss can be used to predict the ductility of glasses even in the putative linear regime of stress versus strain. U loss increases (and the ratio of shear to bulk moduli decreases) with increasing cooling rate, indicating enhanced ductility. In addition, we characterized the degree of reversibility of particle motion during a single shear cycle. We find that irreversible particle motion occurs even in the linear regime of stress versus strain. However, slowly cooled glasses, which undergo smaller rearrangements, are more reversible during a single shear cycle than rapidly cooled glasses. Thus, we show that more ductile glasses are also less reversible.

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Effects of cooling rate on particle rearrangement statistics: Rapidly cooled glasses are more ductile and less reversible

et al. 2017

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Local elasticity and macroscopic plasticity in homogeneous and heterogeneous bulk metallic glasses

Scudino

Shahid

Han

et al. 2019

Applied Physics Letters

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To understand why heterogeneity leads to improved ductility in bulk metallic glasses (BMGs), we derived the local elastic moduli and energy barriers for the activation of shear transformation zones (STZs) in homogeneous and heterogeneous BMGs using high-energy x-ray diffraction. In contrast to the homogeneous glass, STZ activation dynamics in the heterogeneous BMG are spatially nonuniform and the activation of STZs with low energy barriers is favored. Using qualitative arguments, we propose that there is an alternative deformation pathway involving multiple shear bands, which makes the material plastically deformable.

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Structural Relaxation, Rejuvenation and Plasticity of Metallic Glasses: Microscopic Details from Anelastic Relaxation Spectra

Atzmon,

Ju,

Lei

2023

Materials

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The lack of periodicity and long-range order poses significant challenges in explaining and modeling the properties of metallic glasses. Conventional modeling of nonexponential relaxation with stretched exponents leads to inconsistencies and rarely offers information on microscopic properties. Instead, using quasi-static anelastic relaxation, we have obtained relaxation-time spectra over >10 orders of magnitude of time for several metallic glasses. The spectra enable us to examine in microscopic detail the distribution of shear transformation zones and their properties. They reveal an atomically-quantized hierarchy of shear transformation zones, providing insights into the effect of structural relaxation and rejuvenation, the origin of plasticity and the mechanisms of the alpha and beta relaxation.

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Evaluation of approximate measurements of activation-free-energy spectra of shear transformation zones in metallic glasses

Cited by 3 publications

References 7 publications

Effects of cooling rate on particle rearrangement statistics: Rapidly cooled glasses are more ductile and less reversible

Effects of cooling rate on particle rearrangement statistics: Rapidly cooled glasses are more ductile and less reversible

Local elasticity and macroscopic plasticity in homogeneous and heterogeneous bulk metallic glasses

Structural Relaxation, Rejuvenation and Plasticity of Metallic Glasses: Microscopic Details from Anelastic Relaxation Spectra

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