Annealing-induced recrystallization of iron after high pressure torsion at 80 K

Shugaev, K. E.; Degtyarev, M. V.; Воронова, Л. М.; Чащухина, Т. И.; Gapontseva, T. M.

doi:10.22226/2410-3535-2022-2-94-99

Cited by 1 publication

(2 citation statements)

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“…The HPT process was then conducted under a compressive pressure of 5 GPa for N = 10 turns and with a rotation speed of 0.2 rpm. Subsequently, the disk-shaped samples were polished to remove surface roughness, oxides and possible impurities and were annealed at 473, 673 and 1273 K for 1 h; these are typical annealing temperatures for HTP Fe (Todaka et al, 2008;Shugaev et al, 2022). The final thickness of all the HPT samples was 0.36 mm.…”

Section: Methodsmentioning

confidence: 99%

“…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). In Fig.…”

Section: Micromagnetic Sans Theorymentioning

confidence: 96%

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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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Section: Methodsmentioning

confidence: 99%

Section: Micromagnetic Sans Theorymentioning

confidence: 96%