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