Accumulative HPT of Zr-based bulk metallic glasses

Гундеров, Д. В.; Churakova, Anna; Astanin, V. V.; Asfandiyarov, R. N.; Hahn, Horst; Valiev, Ruslan Z.

doi:10.1016/j.matlet.2019.127000

Cited by 26 publications

(26 citation statements)

References 12 publications

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“…We should note that under conventional schemes of deformation, Figure 18. Principle of the "accumulative HPT" process: (a) disk-shaped sample subjected to HPT n = 1; (b) sample cut into four pieces; (c) pieces are stacked on top of the HPT anvil and HPT n = 1 applied again; (d) BMG sample obtained according to this procedure (reprinted from [125] with permission from Elsevier). Table 5.…”

Section: Discussionmentioning

confidence: 99%

“…As shown in [106], the actual shear strain in samples subjected to HPT is significantly lower in comparison with the expected value. In order to achieve high strain in BMGs, the authors proposed a new method: "accumulative HPT [125]. In the accumulative HPT procedure, the sample undergoes several cycles of HPT processing, then cutting, stacking, pressing, and subsequent HPT, as shown in Figure 18.…”

Section: Accumulative Hpt Proceduresmentioning

confidence: 99%

“…In the accumulative HPT procedure, the sample undergoes several cycles of HPT processing, then cutting, stacking, pressing, and subsequent HPT, as shown in Figure 18. Finally, the stacked segments are subjected to HPT with n ≥ 3 as a result of which the fragments are consolidated into a monolithic disk [125]. The total number of revolutions during the "accumulative HPT" processing of Vit105 BMG was n = 5, and the total deformation of the BMG by pressing and shear was roughly estimated as γ = 6 [125].…”

Section: Accumulative Hpt Proceduresmentioning

confidence: 99%

“…Parameters of the amorphous structure of the BMG in different states from XRD (reprinted from[125] with permission from Elsevier).…”

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confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Accumulative Hpt Proceduresmentioning

confidence: 99%

Section: Accumulative Hpt Proceduresmentioning

confidence: 99%

“…Parameters of the amorphous structure of the BMG in different states from XRD (reprinted from[125] with permission from Elsevier).…”

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confidence: 99%

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

Гундеров

Astanin

2020

Metals

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“…In addition, it has been demonstrated earlier that the HPT processing of high-strength materials actually produces a much smaller strain γ than expected, as a result of slippage [17] , [18] . In this context, an original “accumulative high-pressure torsion” (ACC HPT) procedure was proposed in [19] which enables producing much higher true strains in solid metallic materials than the regular HPT technique. In the present work, ACC HPT was first applied to the novel Ti18Zr15Nb SMA.…”

Section: Introductionmentioning

confidence: 99%