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

Recent models of grain-boundary diffusion are briefly reviewed. Models of diffusion along equilibrium boundaries of recrystallization origin in coarse-grained materials and along non-equilibrium boundaries in nanocrystalline materials obtained by gas condensation and compacting or by severe plastic deformation are considered separately.

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The State of Grain Boundaries and Grain-Boundary Diffusion in Ultrafine-Grained Mo Obtained by Severe Plastic Deformation

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.367.130 ◽

2016 ◽

Vol 367 ◽

pp. 130-139 ◽

Cited By ~ 1

Author(s):

Vladimir V. Popov ◽

A.V. Sergeev

Keyword(s):

Plastic Deformation ◽

High Pressure ◽

Grain Boundary ◽

Severe Plastic Deformation ◽

Grain Boundaries ◽

Boundary Diffusion ◽

High Pressure Torsion ◽

Grain Boundary Diffusion ◽

Fast Diffusion ◽

Non Equilibrium

The grain-boundary diffusion of Co in ultra-fine grained Mo processed by high-pressure torsion has been studied by emission Mössbauer spectroscopy and radio-tracer analysis. It is demonstrated that under the severe plastic deformation by high-pressure torsion the non-equilibrium grain boundaries are formed which are the ultra-fast diffusion paths. At annealing in the temperature range of 623-823 K the relaxation of the non-equilibrium boundaries proceeds and their properties approach to those of equilibrium boundaries of recrystallization origin.

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Grain-boundary diffusion of nickel in submicrocrystalline molybdenum processed by severe plastic deformation

Technical Physics Letters ◽

10.1134/s1063785008020156 ◽

2008 ◽

Vol 34 (2) ◽

pp. 136-138 ◽

Cited By ~ 12

Author(s):

G. P. Grabovetskaya ◽

I. P. Mishin ◽

I. V. Ratochka ◽

S. G. Psakhie ◽

Yu. R. Kolobov

Keyword(s):

Plastic Deformation ◽

Grain Boundary ◽

Severe Plastic Deformation ◽

Boundary Diffusion ◽

Grain Boundary Diffusion

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Grain Boundary Diffusion-Controlled Processes and Properties of Bulk Nanostructured Alloys and Steels

Materials Science Forum ◽

10.4028/www.scientific.net/msf.503-504.141 ◽

2006 ◽

Vol 503-504 ◽

pp. 141-148 ◽

Cited By ~ 4

Author(s):

Yu.R. Kolobov ◽

Konstantin Ivanov

Keyword(s):

Plastic Deformation ◽

Grain Boundary ◽

Severe Plastic Deformation ◽

Boundary Diffusion ◽

Diffusion Processes ◽

Grain Boundary Diffusion ◽

Controlled Processes ◽

Bioactive Coating ◽

Diffusion Controlled ◽

Theoretical Investigations

The experimental and theoretical investigations of grain boundary diffusion processes have been performed using metals and alloys in nanostructured state produced by severe plastic deformation and the respective polycrystalline counterparts. The main features of diffusioncontrolled mechanisms of plastic deformation observed by the creep of nanostructured metals are considered. The use of severe plastic deformation treatment and of the effect of activation of diffusion-controlled processes for enhancing the properties of nanostructured steels and alloys designed for engineering and medical applications (nanostructured titanium-bioactive coating composite included) is described and examples are offered.

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