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\subsubsection{\texorpdfstring{Enhanced mechanical properties of Fe-Al alloys with Mn impurity}{Enhanced mechanical properties of FeAl alloys with Mn impurity}}
\label{sec:enhanced_mechanical_properties_of_feal_alloys_with_mn_impurity}


We have examined the structural and mechanical properties of Fe-Al
alloys at various Al concentrations with or without a small amount of
Mn. For each disordered Fe-Al alloy, we considered sundry disordered
configurations to determine the equilibrium structure. It was found
that the disordered Fe-Al alloy with high Al content (\textasciitilde{}25 at\%) becomes
less stable and more brittle than its ordered counterpart
DO\textsubscript{3} second phase. To predict the ductility of Fe-Al alloys,
we estimated Pugh's constant defined by the ratio between bulk and
shear moduli and apply the Pugh's criterion. We found that an addition
of a small amount of Mn may stabilize disordered solid solutions over
the DO\textsubscript{3} second phase. Moreover, the Mn addition also
improves its mechanical properties making the disordered Fe-Al alloy
more ductile than DO\textsubscript{3}.

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