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Effect of heat treatment on diffusion, internal friction, microstructure and mechanical properties of ultra-fine-grained nickel severely deformed by equal-channel angular pressing

Divinski, Sergiy V., Reglitz, Gerrit, Golovin, Igor S., Peterlechner, Martin, Lapovok, Rimma, Estrin, Yuri and Wilde, Gerhard 2015, Effect of heat treatment on diffusion, internal friction, microstructure and mechanical properties of ultra-fine-grained nickel severely deformed by equal-channel angular pressing, Acta materialia, vol. 82, pp. 11-21, doi: 10.1016/j.actamat.2014.08.064.

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Title Effect of heat treatment on diffusion, internal friction, microstructure and mechanical properties of ultra-fine-grained nickel severely deformed by equal-channel angular pressing
Author(s) Divinski, Sergiy V.
Reglitz, Gerrit
Golovin, Igor S.
Peterlechner, Martin
Lapovok, Rimma
Estrin, Yuri
Wilde, Gerhard
Journal name Acta materialia
Volume number 82
Start page 11
End page 21
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-01
ISSN 1359-6454
1873-2453
Keyword(s) ECAP
Grain boundary diffusion
Internal friction
Microhardness
SPD
Summary Severe plastic deformation via equal-channel angular pressing was shown to induce characteristic ultra-fast diffusion paths in Ni (Divinski et al., 2011). The effect of heat treatment on these paths, which were found to be represented by deformation-modified general high-angle grain boundaries (GBs), is investigated by accurate radiotracer self-diffusion measurements applying the 63Ni isotope. Redistribution of free volume and segregation of residual impurities caused by the heat treatment triggers relaxation of the diffusion paths. A correlation between the GB diffusion kinetics, internal friction, microstructure evolution and microhardness changes is established and analyzed in detail. A phenomenological model of diffusion enhancement in deformation-modified GBs is proposed.
Language eng
DOI 10.1016/j.actamat.2014.08.064
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30075948

Document type: Journal Article
Collection: Institute for Frontier Materials
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