The influence of complex thermal treatment on mechanical properties of amorphous materials

Liu, Qinglong; Priezjev, Nikolai V.

doi:10.1016/j.commatsci.2019.01.045

Cited by 24 publications

(21 citation statements)

References 37 publications

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“…More recently, the appearance of clusters of atoms with relatively large nonaffine displacements was connected to rejuvenation of elastostatically loaded binary glasses [18]. In recent years, the collective rearrangements of atoms in disordered solids were also reported during steady [53][54][55][56][57] and periodic [28][29][30][31][32][33][34][35][39][40][41]43,45] deformation and thermal cycling [58][59][60].…”

Section: Resultsmentioning

confidence: 99%

Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions

Priezjev

2021

Journal of Non-Crystalline Solids

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Section: Resultsmentioning

confidence: 99%

Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions

Priezjev

2021

Journal of Non-Crystalline Solids

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“…This definition was first introduced by Falk and Langer and used to identify accurately the location of shear transformations in strained disordered solids [40]. More recently, the spatiotemporal analysis of nonaffine displacements was applied to investigate shear band formation in steadily [12][13][14]42] and periodically [21,23,25,29,30,34] driven amorphous solids, as well as the structural relaxation in thermally cycled [43,44] and elastostatically loaded [45] glasses. Interestingly, the accumulation of atoms with large nonaffine displacements along the xy plane, shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Shear Band Formation in Amorphous Materials under Oscillatory Shear Deformation

Priezjev

2020

Metals

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The effect of periodic shear on strain localization in disordered solids is investigated using molecular dynamics simulations. We consider a binary mixture of one million atoms annealed to a low temperature with different cooling rates and then subjected to oscillatory shear deformation with a strain amplitude slightly above the critical value. It is found that the yielding transition occurs during one cycle but the accumulation of irreversible displacements and initiation of the shear band proceed over larger number of cycles for more slowly annealed glasses. The spatial distribution and correlation function of nonaffine displacements reveal that their collective dynamics changes from homogeneously distributed small clusters to a system-spanning shear band. The analysis of spatially averaged profiles of nonaffine displacements indicates that the location of a shear band in periodically loaded glasses can be identified at least several cycles before yielding. These insights are important for development of novel processing methods and prediction of the fatigue lifetime of metallic glasses.

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“…It was previously found that the nonaffine measure is particularly well suited for identification of localized shear transformations in quiescent and deformed disordered solids [40][41][42]. More recently, the analysis of nonaffine displacements was used to elucidate the structural relaxation dynamics and yielding during time periodic deformation [14, 16, 18, 20-22, 27, 30, 31] and thermal processing [43][44][45][46][47] 8]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Alternating Shear Orientation During Cyclic Loading Facilitates Yielding in Amorphous Materials

Priezjev

2020

J. of Materi Eng and Perform

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The influence of alternating shear orientation and strain amplitude of cyclic loading on yielding in amorphous solids is investigated using molecular dynamics simulations. The model glass is represented via a binary mixture that was rapidly cooled well below the glass transition temperature and then subjected to oscillatory shear deformation. It was shown that periodic loading at strain amplitudes above the critical value first induces structural relaxation via irreversible displacements of clusters of atoms during a number of transient cycles, followed by an increase in potential energy due to the formation of a system-spanning shear band. Upon approaching the critical strain amplitude from above, the number of transient cycles required to reach the yielding transition increases. Interestingly, it was found that when the shear orientation is periodically alternated in two or three dimensions, the number of transient cycles is reduced but the critical strain amplitude remains the same as in the case of periodic shear along a single plane. After the yielding transition, the material outside the shear band continues strain-induced relaxation, except when the shear orientation is alternated in three dimensions and the glass is deformed along the shear band with the imposed strain amplitude every third cycle.

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The influence of complex thermal treatment on mechanical properties of amorphous materials

Cited by 24 publications

References 37 publications

Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions

Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions

Shear Band Formation in Amorphous Materials under Oscillatory Shear Deformation

Alternating Shear Orientation During Cyclic Loading Facilitates Yielding in Amorphous Materials

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