Abstract
• The morphologies of proeutectic FeAl 3 ranging from faceted polygonal prism to non-faceted rods with radial branches can be controlled by increasing the cooling rate. • The crystallographic growth directions, facets and branching behaviors of diverse proeutectic FeAl 3 morphologies were quantitated effectively based on the reconstructed 3D structures. • At a higher cooling rate, twinning mechanism plays a leading role in the formation and growth of FeAl 3 . The 3D morphologies and growth mechanisms of proeutectic FeAl 3 at the Al/Fe interface under different cooling rates were studied by synchrotron X-ray tomography. With increasing cooling rate, FeAl 3 crystals developed from faceted polygonal prism, plates with flat surface, thin ribbon-like with periodic undulating surface to non-faceted rods with radial dendrites in cross section, indicating a gradual interface growth mode transition from two-dimensional layer growth to continuous growth. At a higher cooling rate, twinning mechanism plays a leading role in the formation and growth of FeAl 3 . A link between the morphologies, twinning and crystallographic structure was established based on quantitative analyses on the 3D structures.
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