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Effect of Non-conventional Large Deformations on Microstructure and Properties of Metals

Krzysztof J. Kurzydlowski 1,  Maria Richert ,  Jan Richert 2,  Józef Zasadziński 2,  Malgorzata Sus-Ryszkowska 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

Two special methods, cyclic extrusion compression (in short - CEC) and equal channel angular extrusion (in short- ECAE) have been used for deformation of armco iron, AlMg5 and AlCu4Zr to very large strains, exceeding the range of deformations, obtained by conventional plastic working processes. Above the true strain of about 14 the transformation of typical microstructure, with the small disorientation between subgrains, to microstructure with the large disorientation and nano-size subgrains ha been observed. The results indicate also that the microstructure transformation proceeds by development of microstructure bands and their mutual crossing and division into the nanometric subgrains. The mechanical properties of obtained nonometals show considerable increase in comparison to the values found in conventionally deformed aluminum and iron alloys.

 

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Presentation: oral at E-MRS Fall Meeting 2003, Symposium G, by Maria Richert
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-06-11 23:44
Revised:   2009-06-08 12:55