Recovery of the shear modulus of relaxed bulk glassy Pd40Cu30Ni10P20 by cooling from elevated temperatures at low rates

Mitrofanov, Yu.P.; Khonik, S. V.; Lyakhov, S. A.; Khoviv, A. M.; Khonik, V. A.

doi:10.1016/j.intermet.2010.11.012

Intermetallics

2011

DOI: 10.1016/j.intermet.2010.11.012

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Recovery of the shear modulus of relaxed bulk glassy Pd40Cu30Ni10P20 by cooling from elevated temperatures at low rates

Yu.P. Mitrofanov¹,

S. V. Khonik²,

S. A. Lyakhov³

et al.

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Cited by 5 publications

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“…In this work, we address rejuvenation of a metallic glass produced by cooling of relaxed samples from the supercooled liquid state at laboratory rates. Although a few earlier studies employed this type of rejuvenation, [22,23] its potential and ways of implementation seem to be largely unexplored. We show here that cooling from above T g not only leads to the rejuvenation below T g but also significantly changes the heat absorption in the glass transition region.…”

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Rejuvenation of a Metallic and Oxide Glass by Cooling from the Supercooled Liquid State at Laboratory Rates

Afonin

Кобелев

Khonik

et al. 2018

Physica Rapid Research Ltrs

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Calorimetric study of relaxation and rejuvenation of PdNiP and SiO 2 -based glasses by cooling from the supercooled liquid state at laboratory rates is performed. For the former glass, cooling at the highest rate of 54 K min À1 recovers 34-36% of the enthalpy released upon relaxation. The interplay between relaxation and rejuvenation leads to a dependence of the heat absorption peak above the glass transition temperature T g on the cooling rate. The oxide glass displays a similar effect with analogous dependence on the cooling rate. Qualitative explanations for the observed phenomena are presented.Glasses are labile systems undergoing continuous relaxation toward metastable equilibrium. [1] The latter, however, in most cases is kinetically unachievable on the experimental time scale. Any annealing at temperatures below the glass transition temperature T g is accompanied by structural relaxation, which leads to the changes of practically all physical properties. However, independent of glass nature, it is generally possible to reverse structural relaxation making the structure to evolve toward higher energy states with concurrent change of the properties. This phenomenon is termed the recovery or rejuvenation. For polymer glasses, it was documented long ago. [2,3] From both scientific and application viewpoints, it is very important and challenging.In the case of metallic glasses (MGs), structural relaxation leads as a rule to undesirable structural changes, which result in the deterioration of practically important properties, e.g., causing the loss of plasticity, embrittlement, etc. However, rejuvenation provides partial or even full restoration of these properties. There are quite a few reports on the rejuvenation of MGs in the literature. The first reports on partial or even full disembrittlement produced by annealing below T g were published in the 1980s and beginning of 1990s of the past century. [4][5][6] There are several later papers dealing with the recovery of mechanical properties deteriorated by the preceding structural relaxation below T g . [7][8][9][10][11][12][13][14][15] The rejuvenation procedure in the majority of instances included heating of aged samples into the supercooled liquid region (i.e., above T g ) and subsequent fast cooling at the rates comparable with the production quenching rate (%10 2 K s À1 ) or even bigger. [7][8][9][10][11][12][13][14] In the latter case, the rejuvenation can lead to opposite property changes exceeding by the absolute value those occurring upon preceding structural relaxation below T g . [9,10] Besides thermal processing, rejuvenation of MGs can be achieved by plastic deformation, [7,16] loading within the elastic limit, [17] cryogenic thermocycling, [18] applying hydrostatic stress, [19] ultrasound, [20] or irradiation. [16] Detailed reviews on MGs' thermo-mechanical rejuvenation were published recently. [16,17] On the other hand, any rejuvenation experiments on oxide glasses are unknown to us. In part, this is due to the complexity of fast cooling of sampl...

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confidence: 99%

Rejuvenation of a Metallic and Oxide Glass by Cooling from the Supercooled Liquid State at Laboratory Rates

Afonin

Кобелев

Khonik

et al. 2018

Physica Rapid Research Ltrs

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Crossover and normal structural relaxation in naturally aged glassy PdCuNiP

et al. 2016

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Structural relaxation and shear softening of Pd- and Zr-based bulk metallic glasses near the glass transition

Khonik

Mitrofanov

Макаров

et al. 2015

Journal of Alloys and Compounds

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Recovery of the shear modulus of relaxed bulk glassy Pd40Cu30Ni10P20 by cooling from elevated temperatures at low rates

Cited by 5 publications

References 21 publications

Rejuvenation of a Metallic and Oxide Glass by Cooling from the Supercooled Liquid State at Laboratory Rates

Rejuvenation of a Metallic and Oxide Glass by Cooling from the Supercooled Liquid State at Laboratory Rates

Crossover and normal structural relaxation in naturally aged glassy PdCuNiP

Structural relaxation and shear softening of Pd- and Zr-based bulk metallic glasses near the glass transition

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