Kwon Group, Physics, Kyung Hee University

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Iron-based Materials

Iron is one of the most important and widely-used materials in our lives. We have studied iron nanoclusters and iron-based alloys using ab initio and parametrized calculations.

Enhanced mechanical properties of Fe-Al alloys with Mn impurity

Fe-Al alloys
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 (~25 at%) becomes less stable and more brittle than its ordered counterpart DO3 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 DO3 second phase. Moreover, the Mn addition also improves its mechanical properties making the disordered Fe-Al alloy more ductile than DO3.

Magic Numbers of Iron Nano Clusters

Using tight-binding method implemented with Stoner model of itinerant magnetism, we have searched the magic numbers of iron nano clusters with up to N=30 iron atoms.

lab/research/iron.txt · Last modified: 2014/11/09 01:38 (external edit)