THE INFLUENCE OF HIGH-ANGLE BOUNDARIES ON THE MECHANICAL PROPERTIES OF NANO-CRYSTALLINE IRON OBTAINED BY SEVERE PLASTIC DEFORMATION

Malgorzata Sus-Ryszkowska 1Maria Richert 2Michal J. Wozniak 1Krzysztof J. Kurzydlowski 1

1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
2. AGH University of Science and Technology (AGH), al. Mickiewicza 30, Kraków 30-059, Poland

Abstract

Severe plastic deformation (e > 10) was used to obtain nanostructured iron using two methods: (a) high pressure torsion (HPT) and (b) equal channel angular pressing (ECAP). The grain size after deformation was found to be 3 orders of magnitude smaller than the initial. Significant increase in tensile strength and microhardness was also observed. Special attention was focused on description of mechanical properties in the context of their relation to the character of grain boundaries and homogeneity of microstructure in the material processed by SPD. TEM and AFM method were used for microstructure observation. The significant differences in the mechanical properties and mictrostructure of SPD iron obtained by two processing routes have been observed. These differences can be partly related to the fraction of high-angle grain boundaries.

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Presentation: poster at E-MRS Fall Meeting 2004, Symposium I, by Malgorzata Sus-Ryszkowska
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-29 12:12
Revised:   2009-06-08 12:55
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