Prakt. Met. Sonderband 46 (2014) 293 
visible from 20 at. %, which gives evidence that the formation of Fe supersaturated solid solutions as 
etration and well as of Cu supersaturated solid solutions took place in this multiphase material. 
se of the very 
uced without 80 aL 
alysis can be 
ing the TEM 
n in the TEM 
ations, which 
ation plot, the 2M at%F. 20 nm 
pum and 0.1- — 
ts of Cu and 
ot surprising, 
given by its i 
SEM). u} 
70d 
60 4 
50 
40 
30 2 5 
2-Cu 
10 
ETT 18 19 20 21 22 23 24 25 26 27 28 
Distance (nm) 
Fig. 3: 2D contour plot showing concentration values for Fe in the FesoCuso alloy 
and Cu and Fe concentration profile across Cu/Fe interfaces. 
3DAP analysis has also its disadvantages. Accurate and reproducible positioning of the 
feature of interest in the analysable region of the specimen is challenging. The most 
common method to obtain specimen is the electropolishing technique. Although in nc 
(b) EDX line materials, the probability of finding an interface during specimen preparation is significantly 
enhanced, the process of electropolishing cannot be fully controlled and not all specimen 
preparation attempts are a success. Specimen preparation using focused ion beam milling 
is site-specific and an alternative, but influence of Ga implantation should not be 
neglected. A weakness of the method is also the reconstruction of the data, especially in 
case of two phase materials, due the different atomic density of phases and local 
atomic scale magnification effects [11]. 
d. To give an Information on the chemistry and the possible formation of supersaturated solid solutions, 
| after HPT with a high spatial resolution as well, can also be gained by energy-dispersive X-ray 
indicate that spectroscopy and electron energy loss spectroscopy in a high-resolution scanning TEM. 
~oncentration Such investigations are planned in future but are beyond the scope of this work. It is, 
xing among however, also quite challenging to thin a TEM lamella to sufficient thinness to fulfil the 
ng selected demands of high-resolution transmission electron microscopy. 
ysed volume 
is plot, grain 
files exhibits 4. SUMMARY 
> and Cu is , ; 
ons. The Cu Bulk nanostructured composites can be prepared by HPT deformation. In all investigated 
‘ase is over multiphase materials, f.c.c, b.c.c, or a mixture of f.c.c and b.c.c. non-equilibrium solid 
Solutions are observed. It is shown that characterization of mechanical intermixing of the