Diffusion induced plasticity of nanostructured metals
Yu. R. Kolobov Institute of Strength Physics and Materials Science of SB
RAS, 2/1 Academichesky pr., Tomsk, 634021, Russia

The main characteristic features of grain boundary diffusion of
substitution impurities from an external source (coating) in
nanostructured (produced by severe plastic deformation) metals
(nickel, copper, titanium) have been considered in comparison with
respective ones for grain boundaries in coarse-grained and
nanocrystalline (using electrodeposited nickel by way of example)
states. Physical reasons for the enhancement of diffusivity of grain
boundaries in nanostructured state relative to the diffusivity
coarse-grained metals and bicrystals are discussed.
The analysis of peculiarities and physical mechanisms of plastic
deformation development during creep of nanostructured metals and
dispersed hardened nanocomposites including under the action of
directed grain-boundary diffusion fluxes of substitution or
interstitial impurity from an external source (environment) has been
carried on.
The determining role of diffusion-controlled processes on grain
boundaries in grain boundary sliding development during creep and
superplastic flow of nanostructured metals and alloys in the service
temperature (using Ni, Cu, Ti, Al-Mg-Li, etc. Based alloys by way of
example) is found.
The possibility to realize low-temperature and/or high strain rate
superplasticity of nanosrtuctured metals and alloys has been studied.
The characteristic features of superplasticity of nanostructured
materials relative to respective ones of fine-grained are discussed.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/310 must be provided.