Thermal and Time Stability of Amorphous Alloys

Глезер, А. М.; Potekaev, A. I.; Черетаева, А. О.

doi:10.1201/9781315158112

Cited by 11 publications

(4 citation statements)

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“…which is close to Orowan's dependence (5) showing the interaction of moving dislocations with incoherent particles of the second phase:…”

Section: Strengthening Effects Upon Crystallization Of Aassupporting

confidence: 83%

“…Amorphous alloys (AAs) exhibit unique and practically important properties due to an unusual structural state with a predominance of short-range order in the arrangement of atoms and the absence of translation symmetry over long distances [1][2][3]. One of the main problems preventing the widespread use of such materials is the limited range of their thermal stability [4,5]. Under external actions (in particular, upon heating), the degree of structure disorder of AAs decreases.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Behavior of Fe- and Co-Based Amorphous Alloys after Thermal Action

Permyakova

Глезер

2022

Metals

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The effect of heat treatment on the structure and mechanical properties of Co-Fe-Cr-Si-B/Fe-Cr-B/Fe-Ni-B amorphous alloys has been studied systematically. Melt-quenching (spinning method) was used for production of investigated amorphous alloys. The transmission electron microscopy (TEM) was used to study the structure transformations. The effect of temperature on deformation behavior (plasticity, microhardness, crack resistance, and the density and average length of shear bands) of the amorphous alloys was studied by bending and microindentation. It is shown that the ductile–brittle transition, which occurs at the stage of structure relaxation in amorphous alloys, is caused by two factors: a decrease in the susceptibility of the amorphous matrix to plastic flow and an abrupt decrease in the resistance to the development of quasibrittle cracks. It is established that the transition to a two-phase amorphous–nanocrystalline state upon annealing leads to substantial strengthening of the alloys and a partial recovery of their plasticity. It is proved that the strengthening of amorphous alloys at the initial stages of crystallization can be initiated by the difference in the elastic moduli of the amorphous matrix and the precipitated nanocrystals, as well as by the specific features of the interaction between nanocrystalline phase particles and shear bands propagating under external actions. It is established that the phenomenon of plasticization in amorphous alloys (the crack resistance can increase after annealing in a certain temperature range) is due to the effective retardation of cracks on nanoparticles.

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“…which is close to Orowan's dependence (5) showing the interaction of moving dislocations with incoherent particles of the second phase:…”

Section: Strengthening Effects Upon Crystallization Of Aassupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Fe- and Co-Based Amorphous Alloys after Thermal Action

Permyakova

Глезер

2022

Metals

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“…The BMG are characterized by the formation of a "pileup" at the base of the indent during microindentation because of a tendency to local plastic flow. The plasticity of the deformed volume is determined from the "pileup" [101]. To assess plasticity, one should correlate the "pileup" height in the recovered indent with depth H [101]:…”

Section: Transformation Of the Properties Of Amorphous Alloys As A Rementioning

confidence: 99%

Influence of HPT Deformation on the Structure and Properties of Amorphous Alloys

Гундеров

Astanin

2020

Metals

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Recent studies showed that structural changes in amorphous alloys under high pressure torsion (HPT) are determined by their chemical composition and processing regimes. For example, HPT treatment of some amorphous alloys leads to their nanocrystallization; in other alloys, nanocrystallization was not observed, but structural transformations of the amorphous phase were revealed. HPT processing resulted in its modification by introducing interfaces due to the formation of shear bands. In this case, the alloys after HPT processing remained amorphous, but a cluster-type structure was formed. The origin of the observed changes in the structure and properties of amorphous alloys is associated with the chemical separation and evolution of free volume in the amorphous phase due to the formation of a high density of interfaces as a result of HPT processing. Amorphous metal alloys with a nanocluster structure and nanoscale inhomogeneities, representatives of which are nanoglasses, significantly differ in their physical and mechanical properties from conventional amorphous materials. The results presented in this review show that the severe plastic deformation (SPD) processing can be one of the efficient ways for producing a nanocluster structure and improving the properties of amorphous alloys.

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“…Thus, the propensity to amorphize the alloy with a given chemical composition is characterized by a critical cooling rate Vcr, which, in relation to the spinning method, corresponds to the critical thickness of the quenched strip tcr [6]. For the ultimate cooling rate of 10 6 deg / sec, which can be achieved with spinning, the value of tcr for most amorphous systems is, as a rule, up to 70-80 μm [9]. It should be noted that in recent years a number of easily amorphous multicomponent metal systems have been discovered (mainly based on Pd-Cu, Ti-Zr, Zr-Cu, Mg-Cu), for which Vcr values are so low that they can be obtained in the form of massive rods and ingots [10].…”

Section: Introductionmentioning

confidence: 99%