Yı-phase
Martensitic phases (in absence of y‚)
Fe-rich k-phase
Bainitic a’-phase. zn
E
In contrast to conventional methods potentiostatic etching offers the following additional
advantages:
Sensitive indication of small segregations in the a-phase
Showing of the concentration gradient in the k-precipitates
Considerable improvement in the extraction of k-precipitates during the
preparation of carbon extraction replicas for electron microscopy.
Where as chemical etching is sufficient to exactly define the microstructure in coarse-grained
cast structures of the technical hypoeutectic Al-bronzes, the application of potentiostatic
etching is primarily of advantage with cast alloys of higher Al-content and with all heat
treated alloys.
| PR. Swann, H. Warlimont, Acta Metallur- 5 R. Paton, P.J. Le Thomas, Fonderie (1963),
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98