Effect of alloying element addition on the microstructural evolution and corrosion behaviour of Fe-30 at. % (Al+Cr)‎ alloys

Abstract EN

Fe-Al and Fe-Al-Cr alloys have interest industrial and biomedical applications for their excellent properties.

Two materials of nominal composition Fe-30 at.

% Al and Fe-15 at.

% Al-15 at.

% Cr have been examined.

The aim of this present work is: first, study the order-disorder transformations in these alloys.

Second, the effect of partial substitution of Al by Cr in Fe matrix on the microstrutural evolution and corrosion behaviour of two iron-based alloys.

DSC analyses, XRD, microhardeness measurements, SEM analyses and electrochemical measurements have been carried out.

The obtained results show that during heating the studied alloys undergo order-disorder and disorder-order transformations.

The presence of Cr influences the ordering process of the D03 ordered phase and also varies the microhardness of these materials.

During corrosion test in salt water, the chromium oxide layer (Cr2O3) forms on the surface of Fe-15 at.

% Al-15 at.% Cr alloy and also increases its corrosion resistance.

It is necessary to remember that the formation of D03 ordered phase has an effect on the electrochemical parameters.

These results are a good agreement with the published works.