Intermetallic Phases Identification and Diffusion Simulation in Twin-Roll Cast Al-Fe Clad Sheet |
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| Authors: | Barbora K&#x;ivsk Michaela &#x;lapkov Jozef Veselý Martin Kihoulou Klaudia Fekete Peter Minrik Rostislav Krlík Olexandr Grydin Mykhailo Stolbchenko Mirko Schaper |
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| Institution: | 1.Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic; (B.K.); (J.V.); (M.K.); (K.F.); (P.M.); (R.K.);2.Chair of Materials Science, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany; (O.G.); (M.S.); (M.S.) |
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| Abstract: | Aluminium steel clad materials have high potential for industrial applications. Their mechanical properties are governed by an intermetallic layer, which forms upon heat treatment at the Al-Fe interface. Transmission electron microscopy was employed to identify the phases present at the interface by selective area electron diffraction and energy dispersive spectroscopy. Three phases were identified: orthorhombic Al5Fe2, monoclinic Al13Fe4 and cubic Al19Fe4MnSi2. An effective interdiffusion coefficient dependent on concentration was determined according to the Boltzmann–Matano method. The highest value of the interdiffusion coefficient was reached at the composition of the intermetallic phases. Afterwards, the process of diffusion considering the evaluated interdiffusion coefficient was simulated using the finite element method. Results of the simulations revealed that growth of the intermetallic phases proceeds preferentially in the direction of aluminium. |
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| Keywords: | TEM SAED diffusion Al5Fe2 Al13Fe4 Boltzmann– Matano method |
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