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This is a copy of the slides presented at the meeting but not formally
written up for the volume.
Grain size reduction induced by severe plastic deformation (SPD) and the
resulting mechanical properties have been widely investigated for pure
metals but less is known and reported about multi-phase materials. To
study the grain size reduction mechanisms in multiphase structure
subjected to SPD, two copper based composites (Cu-10%Fe and Cu-43%Cr)
were severely deformed by torsion under high pressure. The grain size
achieved with these composite materials is much smaller than in pure
metals. It is for example in a range of 10 to 20 nm for the Cu-43%Cr
composite, e.g. one order of magnitude lower than in pure Cu processed by
SPD. Three dimensional atom probe data show also the formation of non
equilibrium supersaturated solid solutions. The mechanisms of the
deformation induced intermixing are discussed together with its influence
on the mechanical properties.
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