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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

Version 2 2024-06-04, 05:21
Version 1 2015-08-20, 15:19
journal contribution
posted on 2024-06-04, 05:21 authored by SV Divinski, G Reglitz, IS Golovin, M Peterlechner, Rimma LapovokRimma Lapovok, Y Estrin, G Wilde
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.

History

Journal

Acta materialia

Volume

82

Pagination

11-21

Location

Amsterdam, The Netherlands

ISSN

1359-6454

eISSN

1873-2453

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2015, Elsevier

Publisher

Elsevier