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Evolution of a Defect Structure during Creep Tests of Ultrafine-Grained Metals and Alloys Produced by Severe Plastic Deformation

Authors
  • Betekhtin, V. I.1
  • Kadomtsev, A. G.1
  • Narykova, M. V.1
  • 1 Ioffe Institute, St. Petersburg, 194021, Russia , St. Petersburg (Russia)
Type
Published Article
Journal
Physics of the Solid State
Publisher
Pleiades Publishing
Publication Date
Feb 28, 2020
Volume
62
Issue
2
Pages
318–324
Identifiers
DOI: 10.1134/S1063783420020067
Source
Springer Nature
Keywords
License
Yellow

Abstract

AbstractThe structural factors that lead to a decrease in the mechanostability of ultrafine-grained (UFG) metals and alloys during creep tests at increased temperatures have been revealed using small-angle X-ray scattering, electron microscopy, and the measurements of the density. An important factor is found to be nanopores that form during severe plastic deformation. The development of these nanopores in grain boundaries, which form during the creep, occurs by a diffusion mechanism and leads to the fracture. The role of disperse inclusions and high-angle grain boundaries in the strength of UFG metals and alloys during their “short-time” and long-term loadings is considered.

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