Amorphous-Nanocrystalline Composites Prepared by High-Pressure Torsion

Permyakova, I. E.; Глезер, А. М.

doi:10.3390/met10040511

Cited by 12 publications

(13 citation statements)

References 46 publications

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“…In the first case, the Fe 53.3 Ni 26.5 B 20.2 and Co 28.2 Fe 38.9 Cr 15.4 Si 0.3 B 17.2 (at. %) 25 µm thick amorphous ribbons quenched from the melt were studied [106]. The compacted disks made of these ribbons were subjected to HPT at 6 GPa with a rotation rate of 1 rpm for 0.5 to 9 anvil rotations.…”

Section: Nanocrystallization Of Amorphous Alloys and The Growth Of Particles Of The Second Phasementioning

confidence: 99%

“…In Figure 13a, the size of the nanocrystals in the Co 28.2 Fe 38.9 Cr 15.4 Si 0.3 B 17.2 alloy estimated from the data published in ref. [106] is plotted against rotation number n. First, the nanocrystals appeared already after 1 rotation, then the size of the nanocrystals increased and saturated at ~25 nm after about six anvil rotations. In the Fe 53.3 Ni 26.5 B 20.2 and alloy of the first nanocrystals appeared after three rotations, and their size saturated at about 40 nm (see Figure 11).…”

Section: Nanocrystallization Of Amorphous Alloys and The Growth Of Particles Of The Second Phasementioning

confidence: 99%

“…In the Fe 53.3 Ni 26.5 B 20.2 and alloy of the first nanocrystals appeared after three rotations, and their size saturated at about 40 nm (see Figure 11). When the size of the nanocrystals saturated, their amount continued to increase (compare number of bright spots in SAED patterns in Figure 12a,b) [106]. Thus, in the majority of cases, the nanocrystallization was only investigated for one strain value (most frequently equivalent to n = 5).…”

Section: Nanocrystallization Of Amorphous Alloys and The Growth Of Particles Of The Second Phasementioning

confidence: 99%

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Structure Refinement and Fragmentation of Precipitates under Severe Plastic Deformation: A Review

et al. 2022

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During severe plastic deformation (SPD), the processes of lattice defect formation as well as their relaxation (annihilation) compete with each other. As a result, a dynamic equilibrium is established, and a steady state is reached after a certain strain value. Simultaneously, other kinetic processes act in opposite directions and also compete with each other during SPD, such as grain refinement/growth, mechanical strengthening/softening, formation/decomposition of solid solution, etc. These competing processes also lead to dynamic equilibrium and result in a steady state (saturation), albeit after different strains. Among these steady-state phenomena, particle fragmentation during the second phase of SPD has received little attention. Available data indicate that precipitate fragmentation slows down with increasing strain, though saturation is achieved at higher strains than in the case of hardness or grain size. Moreover, one can consider the SPD-driven nanocrystallization in the amorphous phase as a process that is opposite to the fragmentation of precipitates. The size of these crystalline nanoprecipitates also saturates after a certain strain. The fragmentation of precipitates during SPD is the topic of this review.

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Section: Nanocrystallization Of Amorphous Alloys and The Growth Of Particles Of The Second Phasementioning

confidence: 99%

Section: Nanocrystallization Of Amorphous Alloys and The Growth Of Particles Of The Second Phasementioning

confidence: 99%

Section: Nanocrystallization Of Amorphous Alloys and The Growth Of Particles Of The Second Phasementioning

confidence: 99%

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Structure Refinement and Fragmentation of Precipitates under Severe Plastic Deformation: A Review

et al. 2022

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“…One of the ways to achieve the goal of controlling the microstructure of the element in order to obtain the appropriate performance characteristics is to produce a composite composed of materials with different properties. There are reports on the production of amorphous-amorphous and amorphous-crystalline materials [ 1 , 2 , 3 , 4 , 5 , 6 ] and works on controlling the phase composition and properties of these materials [ 7 , 8 , 9 , 10 ]. Among the methods of producing amorphous composites, technologies based on the production of powders and their amorphization are also used [ 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Development and Properties of the Two-Component Melt-Spun Ni55Fe20Cu5P10B10 Alloy at Elevated Temperatures

et al. 2021

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The aim of this work was to investigate the features of microstructure, phase composition, mechanical properties, and thermal stability of the two-component melt-spun Ni55Fe20Cu5P10B10 alloy. The development of the microstructure after heating to elevated temperatures was studied using scanning electron microscope and in situ high temperature X-ray diffraction. The high-temperature behavior of the two-component melt-spun Ni55Fe20Cu5P10B10 alloy and Ni40Fe40B20, Ni70Cu10P20, and Ni55Fe20Cu5P10B10 alloys melt-spun from single-chamber crucible was investigated using differential scanning calorymetry at different heating rates and by dynamic mechanical thermal analysis. The results show that band-like microstructure of the composite alloy is stable even at 800 K, although coarsening of bands forming the microstructure of the ribbons is observed above 550 K. Plastic deformation is observed in the composite previously heated to temperatures of 600–650 K. The properties of the composite alloy are generally different than the properties obtained for the melt-spun alloy of the same average nominal composition produced traditionally. Additionally, the mechanical and the thermal properties in this composite are inherited from the amorphous state of alloys that are precursors for two-component melt spinning (TCMS) processing.

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“…Permyakova and Glezer [5] present a detailed study of the preparation method and specific features of the changes in the structure and properties of amorphous-nanocrystalline composites formed by high-pressure torsion of melt-quenched iron-and cobalt-based amorphous ribbons and Cu-Nb crystalline nanolaminates.…”

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confidence: 99%