Grain-Boundary Diffusion of 57Co in Ultrafine Nickel after Severe Plastic Deformation

Osinnikov, E. V.; Мурзинова, С. А.; Istomina, A. Yu.; Popov, V. V.; Stolbovskiy, A.V.; Falahutdinov, R. M.

doi:10.1134/s0031918x21100082

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…Our previous studies have shown that diffusion coefficients of Co along grain boundaries of UFG Ni processed by HPT are several orders of magnitude higher than the diffusion coefficients along relaxed GBs of coarse-grained Ni. 85,86) This allows us to conclude that the grain boundaries in HPTprocessed UFG Ni are in the nonequilibrium (deformationmodified) state.…”

Section: Resultsmentioning

confidence: 85%

Specific Features of Grain Boundaries in Nickel Processed by High-Pressure Torsion

2023

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Publications on obtaining bulk nanostructured materials with special properties by various modes of severe plastic deformation, using nickel as an example, are briefly reviewed. Particular attention is paid to the state of grain boundaries, commonly referred to as nonequilibrium, or deformation-modified boundaries, revealed by electron microscopy, including scanning tunneling, Mossbauer spectroscopy, and diffusion studies. It is shown that contribution of specific state of grain boundaries to additional strengthening is often overestimated. In particular, in Ni processed by high pressure torsion, nonequilibrium grain boundaries are formed, which have increased energy and are ultrafast diffusion paths, but they contribute relatively little to the total strengthening.

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Section: Resultsmentioning

confidence: 85%

Specific Features of Grain Boundaries in Nickel Processed by High-Pressure Torsion

2023

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“…В работах [10,11] была исследована зернограничная диффузия в крупнозернистом поликристаллическом никеле и УМЗ никеле, полученном ИПД методом кручения под высоким давлением. Было показано, что коэффициент зернограничной диффузии в УМЗ никеле, подвергнутом ИПД, на несколько порядков выше, чем в крупнозернистом образце с границами зерен рекристаллизационного происхождения.…”

Section: Introductionunclassified

Application of Scanning Tunneling Microscopy for Evaluation of the Non-Equilibrium State of Grain Boundaries in Nickel Subjected to High Pressure Torsion

Osinnikov,

Blinov,

Istomina

et al. 2022

MMPh

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The goal of the study is to estimate the relative free energy of grain boundaries in nickel deformed by high-pressure torsion (HPT) using scanning tunneling microscopy. In the process of work, the following studies have been carried out. The technique has been developed for sample preparation of Ni samples subjected to severe plastic deformation (SPD) by the HPT method for subsequent studies by scanning tunneling microscopy, which provides an average value of the root-mean-square surface roughness of approximately 2 nm. Using scanning tunneling microscopy, images of the nickel surface structure have been obtained, which have been processed using the Gwyddion application program. As a result, the grain boundary profiles have been calculated, based on which the values of the dihedral angles at the bottom of the etching grooves have been calculated and the relative energies of the grain boundaries have been calculated. It has been established that after HPT deformation, the average relative energy of grain boundaries significantly exceeds the relative energy of grain boundaries of coarse-grained nickel with grain boundaries of recrystallization origin. Thus, because of HPT, non-equilibrium grain boundaries are formed in the samples. It has been shown that with an increase in the degree of HPT deformation, an increase in the average relative energy of grain boundaries occurs, which indicates an increase in the degree of their non-equilibrium. It has been demonstrated that SPD by the HPT method makes it possible to achieve a higher level of relative energy of grain boundaries than deformation by the equal-channel angular pressing (ECAP) method.

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Severe plastic deformation for producing superfunctional ultrafine-grained and heterostructured materials: An interdisciplinary review

Edalati,

Ahmed,

Akrami

et al. 2024

Journal of Alloys and Compounds

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Grain-Boundary Diffusion of 57Co in Ultrafine Nickel after Severe Plastic Deformation

Cited by 9 publications

References 18 publications

Specific Features of Grain Boundaries in Nickel Processed by High-Pressure Torsion

Specific Features of Grain Boundaries in Nickel Processed by High-Pressure Torsion

Application of Scanning Tunneling Microscopy for Evaluation of the Non-Equilibrium State of Grain Boundaries in Nickel Subjected to High Pressure Torsion

Severe plastic deformation for producing superfunctional ultrafine-grained and heterostructured materials: An interdisciplinary review

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