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Bimodal grain size distributions in UFG materials produced by SPD - their evolution and effect on the fatigue and monotonic strength properties

Version 2 2024-06-04, 05:22
Version 1 2015-08-20, 15:42
journal contribution
posted on 2024-06-04, 05:22 authored by M Korn, Rimma LapovokRimma Lapovok, A Böhner, HW Höppel, H Mughrabi
In ultrafine-grained (UFG) materials produced by severe plastic deformation (SPD) techniques such as ECAP (equal channel angular pressing), bimodal grain size distributions have been observed under different circumstances, for example shortly after ECAP, after rest or anneal and/or after mild cyclic deformation at rather low homologous temperature. It has been shown that the mechanical monotonic and fatigue properties of some UFG materials can be modified (sometimes enhanced) by introducing a bimodal grain size distribution by a mild annealing treatment which leads, in some cases, to a good combination of strength and ductility. Here, the conditions under which bimodal grain size distributions evolve by (adiabatic) heating during ECAP and during subsequent annealing or cyclic deformation will be explored, and the effects on the mechanical properties, as studied by the authors and as reported so far in the literature, will be reviewed and discussed. In particular, the role of temperature rise during ECAP will be considered in some detail.

History

Journal

Kovove materialy

Volume

49

Pagination

51-63

Location

Bratislava, Slovak Republic

ISSN

0023-432X

Language

eng

Publication classification

C Journal article, C1.1 Refereed article in a scholarly journal

Copyright notice

2011, Institute of Materials and Machine Mechanics

Issue

1

Publisher

Institute of Materials and Machine Mechanics

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