Recrystallization of the ultradispersed structure of pure iron formed at different stages of the deformation-induced strain hardening

Воронова, Л. М.; Degtyarev, M. V.; Чащухина, Т. И.

doi:10.1134/s0031918x07090086

Cited by 20 publications

(5 citation statements)

References 3 publications

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“…The activation energy of ca. 1 eV estimated from the shift of the length change with temperature is in good agreement with the activation energy of recrystallization of HPT-deformed Fe obtained from studies of crystallite growth [17] . A closer inspection [29] shows that the broad stage, in which the decrease in length occurs with increasing temperature ( Fig.…”

supporting

confidence: 85%

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Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion

et al. 2010

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A maximum excess volume ΔV/V ≈ 1.9 × 10−3 in ultrafine-grained Fe prepared by high-pressure torsion is determined by measurements of the irreversible length change upon annealing employing a high-resolution differential dilatometer. Since dislocations and equilibrium-type grain boundaries cannot fully account for the observed released excess volume, the present study yields evidence for a high concentration of free volume-type defects inherent to nanophase materials, which is considered to be the main source of their particular properties, such as strongly enhanced diffusivities.

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supporting

confidence: 85%

“…Annealing of Fe after high-pressure torsion gives rise to recovery and recrystallization [17] . Scanning electron microscopy after dilatometry reveals a uniform recrystallized structure with an average crystallite diameter d of 410 nm.…”

mentioning

confidence: 99%

Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion

et al. 2010

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“…These features can result in increased stability of W at elevated temperatures and a reduction in sintering temperature [9,10]. However, ball milling is a complicated process.…”

Section: Introductionmentioning

confidence: 99%

Effects of ball milling parameters on microstructural evolution and mechanical properties of W-3% Y composites

Zhao

Zhou

Tan

et al. 2015

Journal of Nuclear Materials

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“…Furthermore, the difference between D XRD and D EBSD (see Table 1) suggests that the number of crystallites in a grain increases significantly with increasing T a . This result is related to recrystallization and subsequent grain growth, which occur for annealing temperatures higher than 473 K. As discussed in many publications, modified and enhanced recrystallization by HPT straining is the driving force of the grain-size dependence with the annealing temperature in HPT Fe (Voronova et al, 2007;Oberdorfer et al, 2010). Moreover, it is well known that the recrystallization process also gives rise to a recrystallization texture of an axial h110i type in HPT Fe (Shugaev et al, 2022).…”

Section: Micromagnetic Sans Theorymentioning

confidence: 93%

Effect of annealing on the magnetic microstructure of high-pressure torsion iron: the relevance of higher-order contributions to the magnetic small-angle neutron scattering cross section

Bersweiler¹,

Sato²,

Adachi³

et al. 2023

Int Union Crystallogr J

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The development of higher-order micromagnetic small-angle neutron scattering theory in nanocrystalline materials is still in its infancy. One key challenge remaining in this field is understanding the role played by the microstructure on the magnitude and sign of the higher-order scattering contribution recently observed in nanocrystalline materials prepared by high-pressure torsion. By combining structural and magnetic characterization techniques, namely X-ray diffraction, electron backscattered diffraction and magnetometry with magnetic small-angle neutron scattering, this work discusses the relevance of higher-order terms in the magnetic small-angle neutron scattering cross section of pure iron prepared by high-pressure torsion associated with a post-annealing process. The structural analysis confirms: (i) the preparation of ultra-fine-grained pure iron with a crystallite size below 100 nm and (ii) rapid grain growth with increasing annealing temperature. The analysis of neutron data based on the micromagnetic small-angle neutron scattering theory extended to textured ferromagnets yields uniaxial magnetic anisotropy values that are larger than the magnetocrystalline value reported for bulk iron, supporting the existence of induced magnetoelastic anisotropy in the mechanically deformed samples. Furthermore, the neutron data analysis revealed unambiguously the presence of non-negligible higher-order scattering contributions in high-pressure torsion iron. Though the sign of the higher-order contribution might be related to the amplitude of the anisotropy inhomogeneities, its magnitude appears to be clearly correlated to the changes in the microstructure (density and/or shape of the defects) induced by combining high-pressure torsion and a post-annealing treatment.

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Recrystallization of the ultradispersed structure of pure iron formed at different stages of the deformation-induced strain hardening

Cited by 20 publications

References 3 publications

Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion

Absolute concentration of free volume-type defects in ultrafine-grained Fe prepared by high-pressure torsion

Effects of ball milling parameters on microstructural evolution and mechanical properties of W-3% Y composites

Effect of annealing on the magnetic microstructure of high-pressure torsion iron: the relevance of higher-order contributions to the magnetic small-angle neutron scattering cross section

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