[Kovove materialy - Metallic materials]
    Thu - July 19, 2018 - 08:10 No. of hits : 944747 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 49 (2011), Issue 1

Bimodal grain size distributions in UFG materials produced by SPD – their evolution and effect on the fatigue and monotonic strength properties
KORN, M., LAPOVOK, R., BOHNER, A., HOPPEL, H. W., MUGHRABI, H.
vol. 49 (2011), no. 1, pp. 51 - 63

Abstract
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.

Key words
UFG, ultrafine-grained microstructure, bimodal grain size distribution, fatigue life enhancement, grain coarsening, ECAP temperature rise.

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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