"Perspective of nanomaterials production by cyclic extrusion compression method of exerting unconventional, large plastic deformations."

Maria Richert Sonia Boczkal 1Jan Richert 1Józef Zasadziński 1

1. AGH University of Science and Technology (AGH), al. Mickiewicza 30, Kraków 30-059, Poland


Aluminium and copper monocrystals and also AlMg5 and AlCu4Zr alloys have been deformed by the cyclic extrusion compression method (CEC) in the range of true strains j = 0,4 - 14. It has been found that about 50% of the volume fraction of aluminium alloys samples, deformed to the true strain j = 14, shows features of nanostructure. This kind of microstructure consists of nanograins with the average dimension of about 150 - 200 nm, having large misorientation. The investigations indicate that mutually crossing of microbands is the main mechanism of formation of nanograins. In the areas of mutually crossing microbands, the nanograins have been formed, showing large misorientation angles.
In aluminium and copper monocrystals also about 50% of investigation subgrains shown large misorientation, however their size was much larger than the typical nanograin size. In aluminium monocrystals it showed dimension of about 600 nm. In copper monocrystals subgrains had average dimension of about 200 nm and were more closed to the typical nanosize grains.
The aluminium alloys, deformed to the true strain of about 14 revealed very high level of microhardness (about 100 mHV), comparabled with the level of properties, characteristic for nanomaterials produced by other methods. The level of microhardness of copper monocrystals after the 14th of true strain by the CEC method, was comparabled to the microhardness of copper obtained by the condensation - evaporation method.
The obtained results indicate that using the CEC method it is possible to produce the bulk nanomaterials, especially from the aluminium alloys, which reveal the unconventional large level of mechanical properties.

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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: 2003-05-05 17:09
Revised:   2009-06-08 12:55
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