Physical model of the low-temperature-induced change in the structure and properties of amorphous alloys

Zaichenko, S.G.; Глезер, А. М.

doi:10.1134/1.1536212

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…Ketov et al [26] have suggested that rejuvenation is associated with thermal cycling and not with ongoing change at 77 K. The measured effects on magnetic properties [39,40], however, show that a longer hold at 77 K can have a greater effect, and this merits study for cycling treatments.…”

Section: Stored Energy From Thermal Cyclingmentioning

confidence: 99%

“…We have made a test of the effect of tension, applied to a 40-μm-thick melt-spun ribbon of Pd 40 Cu 30 Ni 10 P 20 . A stress of 12 MPa, 1% of the yield stress σ y = 1.2 GPa, was applied for 68 h at RT.…”

Section: Stored Energy From Elastostatic Loadingmentioning

confidence: 99%

“…There were earlier reports [39][40][41][42] of the effects of cryogenic treatments (single holds for various times at 77 K). The reported effects include reduced yield stress and Young modulus [40].…”

Section: Stored Energy From Thermal Cyclingmentioning

confidence: 99%

“…The reported effects include reduced yield stress and Young modulus [40]. Most of these studies were on ferromagnetic metallic glasses (melt-spun ribbons) and a variety of magnetic properties were found to change.…”

Section: Stored Energy From Thermal Cyclingmentioning

confidence: 99%

“…In other cases, for example Fe-and Ni-based melt-spun ribbons [5,31], the spectrum appears monomodal with long approach to the main peak, or, in contrast, there is a quite separate low-temperature peak (e.g. at ~0.7 T g for Pd 40 Cu 30 Ni 10 P 20 BMG [28]) (Figure 3). This diversity in behaviour is similar to that of the loss modulus seen on heating in dynamic mechanical analysis (DMA), where increasingly evident low-temperature relaxation has been classified as 'excess wing' , 'broad hump' and 'peak' [45].…”

Section: The Relaxation Spectrummentioning

confidence: 99%

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Stored energy in metallic glasses due to strains within the elastic limit

Greer

Sun

2016

Philosophical Magazine

112

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Room temperature loading of metallic glasses, at stresses below the macroscopic yield stress, raises their enthalpy and causes creep. Thermal cycling of metallic glasses between room temperature and 77 K also raises their enthalpy. In both cases, the enthalpy increases are comparable to those induced by heavy plastic deformation, but, as we show, the origins must be quite different. For plastic deformation, the enthalpy increase is a fraction (<10%) of the work done (WD) (and, in this sense, the behaviour is similar to that of conventional polycrystalline metals and alloys). In contrast, the room temperature creep and the thermal cycling involve small strains well within the elastic limit; in these cases, the enthalpy increase in the glass exceeds the WD, by as much as three orders of magnitude. We argue that the increased enthalpy can arise only from an endothermic disordering process drawing heat from the surroundings. We examine the mechanisms of this process. The increased enthalpy ('stored energy') is a measure of rejuvenation and appears as an exothermic heat of relaxation on heating the glass. The profile of this heat release (the 'relaxation spectrum') is analysed for several metallic glasses subjected to various treatments. Thus, the effects of the small-strain processing (creep and thermal cycling) can be better understood, and we can explore the potential for improving properties, in particular the plasticity, of metallic glasses. Metallic glasses can exhibit a wide range of enthalpy at a given temperature, and small-strain processing may assist in accessing this for practical purposes.

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Section: Stored Energy From Thermal Cyclingmentioning

confidence: 99%

Section: Stored Energy From Elastostatic Loadingmentioning

confidence: 99%