Metallography 
The metallographic investigations were carried out on specimens manufactured from spray 
formed and spray formed + hot pressed billets by mechanical cutting with water cooling. The 
specimens were prepared by mechanical grinding and polishing. An etchant consisting of 
100 ml aqua dest. + 40 g potassium pyro-sulphite + 11 ml stock solution after Klemm ( 
saturated solution of 1000 g sodium thiosulfate in 300 ml aqua dest, 40°C ) were applied to 
the visualization of the microstructures. 
X — Ray diffraction 
By use of a X — ray diffractometer ( Cu — Ka — radiation ) patterns of the specimens were 
made to identification of the phases in the microstructures. The JCPDS — Datei was applied to 
the evaluation of the patterns. 
Two kinds of the heat treatment were carried out of small specimens: 
a. betatization of the specimens at several temperatures ( from 700 to 950°C ), detention 
time: 30 minutes, oil quenching, 
b. annealing of the betatized specimens at several temperatures ( from 500 to 750°C ), Fig 
holding period: 30 minutes, air cooling. 
4. Results and discussion 
Fig.5 shows the microstructure of the spray formed alloy. It is observed three phases: 
the y, — phase ( Cug Aly ) which exists seam — like at the former ß — grain boundaries 
and in form of rosette — like particles inside of the former f — grains, 
the ordered, orthorhombic ; — phase ( Cuz Al) presenting the matrix, 
finedisperse precipitations of the cubic x — phase ( Fe; Al) 
This interpretation of the microstructure is proved by the X — ray diffraction pattern 
presenting in Fig.6. The reflections of the named three phases appear in the pattern . 
Figure 
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