Effect of High-Pressure Torsion Deformation and Subsequent Annealing on Structure and Magnetic Properties of Overquenched Melt-Spun Nd9Fe85B6 Alloy

Попов, А. Г.; Гавико, В. С.; Щеголева, Н. Н.; Shreder, L.A.; Gunderov, D. V.; Stolyarov, V. V.; Li, W.; Li, L.L.; Zhang, X.Y.

doi:10.1016/s1006-706x(08)60175-2

Cited by 24 publications

(20 citation statements)

References 15 publications

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“…Nanostructured RE 2 Fe 14 B (RE = Nd, Pr)-based alloys with high coercivity H C up to 2240 kA/m were produced via HPT followed by annealing at 600°C [32]. Similar results were reported for melt-spun Nd 9 Fe 85 B 6 alloy [33]. Metal-ceramic powder mixtures consisting of Co (ferromagnetic) and NiO (antiferromagnetic) phases were compacted by HPT both with and without a prior BM [34].…”

Section: Nanostructured Magnetssupporting

confidence: 54%

Bulk Nanostructured Metals for Innovative Applications

Sabirov¹,

Enikeev²,

Murashkin³

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

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As seen from Chap. 3 of this book, nanostructuring of various metallic materials is a key for obtaining extraordinary multifunctional properties that are very attractive for different structural and functional applications. Materials experts have asserted that materials breakthroughs in the twentieth century required about 20 years from the time of invention to gain widespread market acceptance [1].1 Bulk nanostructured metallic materials also have been following this track. Despite a wide research started at the beginning of 1990, very significant progress in their commercialization has been made just in recent years, which is evident by the first production of advanced pilot articles from nanostructured metals and alloys with new functionality. These aspects of innovations of bulk nanostructured metallic materials processed by SPD are discussed in this chapter.Application and commercialization of bulk nanostructured metallic materials are associated with three primary points: their superior properties, their efficient fabrication, and the possibility to produce cutting-edge products from these materials. Analytical reports documented more than 100 specific market areas for nanostructured metals [2,3], and it is evident that many of these new structural and functional applications involve extreme environments where exceptional strength and improved functional properties are needed. Below are the examples of nanomaterials developments for their innovation applications in engineering and medicine. Nanostructured Ti and Ti Alloys for Biomedical EngineeringPure Ti possesses the highest biocompatibility with living organisms, but it has limited use in medicine due to its low strength.

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Section: Nanostructured Magnetssupporting

confidence: 54%

Bulk Nanostructured Metals for Innovative Applications

Sabirov¹,

Enikeev²,

Murashkin³

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

View full text Add to dashboard Cite

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“…In these works, the formation of separate nanocrystals in shear bands during deformation by upsetting, stretching, or microindentation was revealed. For the first time, nanocrystallization of the amorphous alloys during HPT was observed in the work [49,52]. We should note that whereas during conventional deformation, nanocrystallization was observed in only a small amount of the amorphous material in the shear It was also shown that after the high-energy ball milling of the Zr 70 Cu 20 Ni 10 metallic glass, the spacing between the shear bands ranged from 30 to 70 nm [61].…”

Section: Introductionmentioning

confidence: 86%

“…The introduction of shear bands using SPD has a significant effect on both the microstructure and atomic structure of metal glasses [41,[50][51][52][53][54][55]. According to some works, excess free volume is accumulated in shear bands in BMGs formed at ambient temperature [62,63].…”

Section: Introductionmentioning

confidence: 99%

“…The transformation path of the amorphous structure depends on the composition of the amorphous alloy and the SPD processing regimes. Among the interesting phenomena observed in amorphous alloys of some compositions is nanocrystallization during SPD processing at room temperature [41,[51][52][53][54]. In a series of earlier publications, it was shown that nanocrystallization in the amorphous phase occurs under deformation [66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

“…In a series of studies [41,42,49,[51][52][53][54]70], nanocrystallization during HPT of initially amorphous melt-spun (MS) Nd 12 Fe 82 B 6 , Nd 9 Fe 84 B 7 ribbons was investigated. In [52], the amorphous MS Nd 12 Fe 82 B 6 alloy ribbons were subjected to SPD by HPT at room temperature under a pressure of P = 5 GPa. As a result of this processing, monolithic 100%-density disc samples having a diameter of 10 mm and a thickness of 0.2 mm were produced from the initial ribbons.…”

Section: Introductionmentioning

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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